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Re: Macintosh 12" RGB Display M1296G owners please help [message #362281] Tue, 30 January 2018 20:08 Go to next message
The One True Stickman is currently offline  The One True Stickman
Messages: 85
Registered: April 2013
Karma: 0
Member
Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.

On Tue, Jan 30, 2018 at 7:58 PM, <theonetruestickman@gmail.com> wrote:

> Added to the folder - in case colors aren't visible, here are resistor
> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
> look like a 1% metal film:
>
> R919 10K (Brown Black Orange)
> R920 47K (Red Violet Orange)
> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
> read)
> R523 12K (Brown Red Orange)
> R423 68K (Blue Grey Black Red 1% metal film)
> R506 6K8 (Blue Grey Red)
>
> Let me know if you need anything else, I didn't have more than a few
> minutes today.
>
> I'd bet the only real difference between the US & European model is in the
> line voltage power supply side of the board and the rest is pretty similar.
> There's a photo of the entire board and one of just the signals/HV side.
> For future searchers: I will upload these all to flickr or imgur as well
> and post the link, as I won't keep them in dropbox forever.
>
>
>
> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zgba@o2.pl> wrote:
>
>>>> is yours also a US model or an international?
>>
>> It's an european one. Seems like there are some differences between our
>> models. Still, I'd like to see a few close shots of your board.
>>
>> So if you could take a pic of the following elements, that would be
>> great. To make it easier, I'm gonna tell you rough directions (my board is
>> facing the flyback down, so the CRT is on my right hand side) and their
>> orientation.
>>
>> R919, R920 - two small ones, center right (under the CRT neck) in close
>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>> vertical
>> R521 - near the flyback transformer, slightly above and on the left;
>> horizontal
>> R523 - slightly lower than the previous one; horizontal
>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>> R506 - far bottom left, above H-hold pot; horizontal
>>
>> Those are the troublesome ones. Please take a picture of the underside of
>> the board - even if they are slightly different, I should be able to figure
>> out the differences by looking at the connections.
>>
>> Many thanks.
>> Mateusz
>>
>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>> Stickman napisał:
>>>
>>> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>>> model or an international? Some photos linked below, I can pull the boards
>>> out if needed.
>>>
>>> https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc
>>> H_zyi40a?dl=0
>>> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>>
>>> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>>
>>>> Oh, that would be great. If you don't mind, I'd tell you which
>>>> close-ups I need the most.
>>>>
>>>> BR,
>>>> Mateusz
>>>>
>>>> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One
>>>> True Stickman napisał:
>>>> >
>>>> > I think I have this monitor, but will have to dig it out of the closet
>>>> > to check. If my memory is correct I'd be happy to grab some photos in the
>>>> > next couple days
>>>> >
>>>> > On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >
>>>> >> Hello there,
>>>> >>
>>>> >> some time ago I got my first Mac ever - an LCII with a 12" RGB
>>>> >> Monitor. The whole setup was stored in a moist basement and unfortunately
>>>> >> somebody has spilled some washing powder all over it. It turns out that
>>>> >> this stuff is even more corrosive than battery acid. The computer itself
>>>> >> was in a relative good condition. I had to replace some components, repair
>>>> >> two broken traces and give it a good clean and after that it happens to
>>>> >> work just fine.
>>>> >>
>>>> >> The monitor is a different story. It was very badly corroded,
>>>> >> especially resistors were covered with rust. I have desoldered all of them
>>>> >> but a few of them were faulty and I couldn't measure their values. Color
>>>> >> bars were either washed out or totally covered with rust. I have figured
>>>> >> out most of them but I still have some pure guesses. There's no (useful)
>>>> >> service manual or schematic I could use.
>>>> >>
>>>> >> Before anybody tells me no to bother - I know that this stuff is
>>>> >> neither vintage nor rare, but I'm really having fun trying to rescue old
>>>> >> hardware. Right now I'm at the point where the PCB is totally emptied of
>>>> >> any parts and once I fix the traces and cover them back with solder mask, I
>>>> >> will start re-populating the board.
>>>> >>
>>>> >> TL;DR - is there anybody out there willing to disassemble his M1296G
>>>> >> and take a few photos of the main board?
>>>> >>
>>>> >> Thanks a lot.
>>>> >>
>>>> >> BR,
>>>> >> Mateusz
>>>> >>
>>>> >> --
>>>> >> --
>>>> >> -----
>>>> >> You received this message because you are a member of the Vintage
>>>> >> Macs group.
>>>> >> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and
>>>> >> our netiquette guide is at http://www.lowendmac.com/lists
>>>> >> /netiquette.shtml
>>>> >> To post to this group, send email to vintag...@googlegroups.com
>>>> >> To leave this group, send email to vintage-macs...@googlegroups.com
>>>> >> For more options, visit this group at http://groups.google.com/group
>>>> >> /vintage-macs
>>>> >>
>>>> >> Support for older Macs: http://lowendmac.com/services/
>>>> >> ---
>>>> >> You received this message because you are subscribed to the Google
>>>> >> Groups "Vintage Macs" group.
>>>> >> To unsubscribe from this group and stop receiving emails from it,
>>>> >> send an email to vintage-macs...@googlegroups.com.
>>>> >> For more options, visit https://groups.google.com/d/optout.
>>>> >>
>>>> >
>>>> > --
>>>> --
>>>> -----
>>>> You received this message because you are a member of the Vintage Macs
>>>> group.
>>>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and
>>>> our netiquette guide is at http://www.lowendmac.com/lists
>>>> /netiquette.shtml
>>>> To post to this group, send email to vintag...@googlegroups.com
>>>> To leave this group, send email to vintage-macs...@googlegroups.com
>>>> For more options, visit this group at http://groups.google.com/group
>>>> /vintage-macs
>>>>
>>>> Support for older Macs: http://lowendmac.com/services/
>>>> ---
>>>> You received this message because you are subscribed to the Google
>>>> Groups "Vintage Macs" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>> an email to vintage-macs...@googlegroups.com.
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>> --
>> --
>> -----
>> You received this message because you are a member of the Vintage Macs
>> group.
>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our
>> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
>> To post to this group, send email to vintage-macs@googlegroups.com
>> To leave this group, send email to vintage-macs+unsubscribe@googl
>> egroups.com
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>> /vintage-macs
>>
>> Support for older Macs: http://lowendmac.com/services/
>> ---
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>> "Vintage Macs" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to vintage-macs+unsubscribe@googlegroups.com.
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>>
>
>

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Re: Macintosh 12" RGB Display M1296G owners please help [message #362283 is a reply to message #362281] Fri, 02 February 2018 08:29 Go to previous messageGo to next message
je03@jagdt.com is currently offline  je03@jagdt.com
Messages: 11
Registered: October 2013
Karma: 0
Junior Member
perhaps another typo ?

> Am 31.01.2018 um 02:08 schrieb theonetruestickman@gmail.com:
>
> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.
>
> On Tue, Jan 30, 2018 at 7:58 PM, <theonetruestickman@gmail.com <mailto:theonetruestickman@gmail.com>> wrote:
> Added to the folder - in case colors aren't visible, here are resistor codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which look like a 1% metal film:
>
> R919 10K (Brown Black Orange)


> R920 47K (Red Violet Orange)

27K

> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to read)
> R523 12K (Brown Red Orange)
> R423 68K (Blue Grey Black Red 1% metal film)
> R506 6K8 (Blue Grey Red)
>
> Let me know if you need anything else, I didn't have more than a few minutes today.
>
> I'd bet the only real difference between the US & European model is in the line voltage power supply side of the board and the rest is pretty similar. There's a photo of the entire board and one of just the signals/HV side.
> For future searchers: I will upload these all to flickr or imgur as well and post the link, as I won't keep them in dropbox forever.
>
>
>
> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zgba@o2.pl <mailto:zgba@o2.pl>> wrote:
>>> is yours also a US model or an international?
>
> It's an european one. Seems like there are some differences between our models. Still, I'd like to see a few close shots of your board.
>
> So if you could take a pic of the following elements, that would be great. To make it easier, I'm gonna tell you rough directions (my board is facing the flyback down, so the CRT is on my right hand side) and their orientation.
>
> R919, R920 - two small ones, center right (under the CRT neck) in close proximity of Q905 transistor (with a big heat sink) and two blue disc caps; vertical
> R521 - near the flyback transformer, slightly above and on the left; horizontal
> R523 - slightly lower than the previous one; horizontal
> R423 - left to the J501 (vertical connector, lots of wires); horizontal
> R506 - far bottom left, above H-hold pot; horizontal
>
> Those are the troublesome ones. Please take a picture of the underside of the board - even if they are slightly different, I should be able to figure out the differences by looking at the connections.
>
> Many thanks.
> Mateusz
>
> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True Stickman napisał:
> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US model or an international? Some photos linked below, I can pull the boards out if needed.
>
> https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc H_zyi40a?dl=0 < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>
> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl <>> wrote:
> Oh, that would be great. If you don't mind, I'd tell you which close-ups I need the most.
>
> BR,
> Mateusz
>
> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One True Stickman napisał:
> I think I have this monitor, but will have to dig it out of the closet to check. If my memory is correct I'd be happy to grab some photos in the next couple days
>
> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl <>> wrote:
> Hello there,
>
> some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor. The whole setup was stored in a moist basement and unfortunately somebody has spilled some washing powder all over it. It turns out that this stuff is even more corrosive than battery acid. The computer itself was in a relative good condition. I had to replace some components, repair two broken traces and give it a good clean and after that it happens to work just fine.
>
> The monitor is a different story. It was very badly corroded, especially resistors were covered with rust. I have desoldered all of them but a few of them were faulty and I couldn't measure their values. Color bars were either washed out or totally covered with rust. I have figured out most of them but I still have some pure guesses. There's no (useful) service manual or schematic I could use.
>
> Before anybody tells me no to bother - I know that this stuff is neither vintage nor rare, but I'm really having fun trying to rescue old hardware. Right now I'm at the point where the PCB is totally emptied of any parts and once I fix the traces and cover them back with solder mask, I will start re-populating the board.
>
> TL;DR - is there anybody out there willing to disassemble his M1296G and take a few photos of the main board?
>
> Thanks a lot.
>
> BR,
> Mateusz
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml <http://lowendmac.com/lists/vintagemacs.shtml> and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml <http://www.lowendmac.com/lists/netiquette.shtml>
> To post to this group, send email to vintag...@googlegroups.com <>
> To leave this group, send email to vintage-macs...@googlegroups.com <>
> For more options, visit this group at http://groups.google.com/group/vintage-macs <http://groups.google.com/group/vintage-macs>
>
> Support for older Macs: http://lowendmac.com/services/ <http://lowendmac.com/services/>
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs...@googlegroups.com <>.
> For more options, visit https://groups.google.com/d/optout <https://groups.google.com/d/optout>.
>
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml <http://lowendmac.com/lists/vintagemacs.shtml> and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml <http://www.lowendmac.com/lists/netiquette.shtml>
> To post to this group, send email to vintag...@googlegroups.com <>
> To leave this group, send email to vintage-macs...@googlegroups.com <>
> For more options, visit this group at http://groups.google.com/group/vintage-macs <http://groups.google.com/group/vintage-macs>
>
> Support for older Macs: http://lowendmac.com/services/ <http://lowendmac.com/services/>
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs...@googlegroups.com <>.
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>
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml <http://lowendmac.com/lists/vintagemacs.shtml> and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml <http://www.lowendmac.com/lists/netiquette.shtml>
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>
> Support for older Macs: http://lowendmac.com/services/ <http://lowendmac.com/services/>
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com <mailto:vintage-macs+unsubscribe@googlegroups.com>.
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>
>
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml <http://lowendmac.com/lists/vintagemacs.shtml> and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml <http://www.lowendmac.com/lists/netiquette.shtml>
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> To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
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>
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> ---
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Support for older Macs: http://lowendmac.com/services/
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Re: Macintosh 12" RGB Display M1296G owners please help [message #362284 is a reply to message #362283] Fri, 02 February 2018 09:39 Go to previous messageGo to next message
The One True Stickman is currently offline  The One True Stickman
Messages: 85
Registered: April 2013
Karma: 0
Member
Yes, that should have been 27K - thanks! That's why I listed the color code
*and* took photos... :)

On Fri, Feb 2, 2018 at 8:29 AM, je03@jagdt.com <je03@jagdt.com> wrote:

> perhaps another typo ?
>
> Am 31.01.2018 um 02:08 schrieb theonetruestickman@gmail.com:
>
> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.
>
> On Tue, Jan 30, 2018 at 7:58 PM, <theonetruestickman@gmail.com> wrote:
>
>> Added to the folder - in case colors aren't visible, here are resistor
>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>> look like a 1% metal film:
>>
>> R919 10K (Brown Black Orange)
>>
>
>
> R920 47K (Red Violet Orange)
>>
>
> 27K
>
> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
>> read)
>>
> R523 12K (Brown Red Orange)
>> R423 68K (Blue Grey Black Red 1% metal film)
>> R506 6K8 (Blue Grey Red)
>>
>> Let me know if you need anything else, I didn't have more than a few
>> minutes today.
>>
>> I'd bet the only real difference between the US & European model is in
>> the line voltage power supply side of the board and the rest is pretty
>> similar. There's a photo of the entire board and one of just the signals/HV
>> side.
>> For future searchers: I will upload these all to flickr or imgur as well
>> and post the link, as I won't keep them in dropbox forever.
>>
>>
>>
>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zgba@o2.pl> wrote:
>>
>>>> > is yours also a US model or an international?
>>>
>>> It's an european one. Seems like there are some differences between our
>>> models. Still, I'd like to see a few close shots of your board.
>>>
>>> So if you could take a pic of the following elements, that would be
>>> great. To make it easier, I'm gonna tell you rough directions (my board is
>>> facing the flyback down, so the CRT is on my right hand side) and their
>>> orientation.
>>>
>>> R919, R920 - two small ones, center right (under the CRT neck) in close
>>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>>> vertical
>>> R521 - near the flyback transformer, slightly above and on the left;
>>> horizontal
>>> R523 - slightly lower than the previous one; horizontal
>>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>>> R506 - far bottom left, above H-hold pot; horizontal
>>>
>>> Those are the troublesome ones. Please take a picture of the underside
>>> of the board - even if they are slightly different, I should be able to
>>> figure out the differences by looking at the connections.
>>>
>>> Many thanks.
>>> Mateusz
>>>
>>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>>> Stickman napisał:
>>>>
>>>> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>>>> model or an international? Some photos linked below, I can pull the boards
>>>> out if needed.
>>>>
>>>> https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc
>>>> H_zyi40a?dl=0
>>>> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>>>
>>>> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>>>
>>>> > Oh, that would be great. If you don't mind, I'd tell you which
>>>> > close-ups I need the most.
>>>> >
>>>> > BR,
>>>> > Mateusz
>>>> >
>>>> > W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The
>>>> > One True Stickman napisał:
>>>> >>
>>>> >> I think I have this monitor, but will have to dig it out of the
>>>> >> closet to check. If my memory is correct I'd be happy to grab some photos
>>>> >> in the next couple days
>>>> >>
>>>> >> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >>
>>>> >>> Hello there,
>>>> >>>
>>>> >>> some time ago I got my first Mac ever - an LCII with a 12" RGB
>>>> >>> Monitor. The whole setup was stored in a moist basement and unfortunately
>>>> >>> somebody has spilled some washing powder all over it. It turns out that
>>>> >>> this stuff is even more corrosive than battery acid. The computer itself
>>>> >>> was in a relative good condition. I had to replace some components, repair
>>>> >>> two broken traces and give it a good clean and after that it happens to
>>>> >>> work just fine.
>>>> >>>
>>>> >>> The monitor is a different story. It was very badly corroded,
>>>> >>> especially resistors were covered with rust. I have desoldered all of them
>>>> >>> but a few of them were faulty and I couldn't measure their values. Color
>>>> >>> bars were either washed out or totally covered with rust. I have figured
>>>> >>> out most of them but I still have some pure guesses. There's no (useful)
>>>> >>> service manual or schematic I could use.
>>>> >>>
>>>> >>> Before anybody tells me no to bother - I know that this stuff is
>>>> >>> neither vintage nor rare, but I'm really having fun trying to rescue old
>>>> >>> hardware. Right now I'm at the point where the PCB is totally emptied of
>>>> >>> any parts and once I fix the traces and cover them back with solder mask, I
>>>> >>> will start re-populating the board.
>>>> >>>
>>>> >>> TL;DR - is there anybody out there willing to disassemble his M1296G
>>>> >>> and take a few photos of the main board?
>>>> >>>
>>>> >>> Thanks a lot.
>>>> >>>
>>>> >>> BR,
>>>> >>> Mateusz
>>>> >>>
>>>> >>> --
>>>> >>> --
>>>> >>> -----
>>>> >>> You received this message because you are a member of the Vintage
>>>> >>> Macs group.
>>>> >>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and
>>>> >>> our netiquette guide is at http://www.lowendmac.com/lists
>>>> >>> /netiquette.shtml
>>>> >>> To post to this group, send email to vintag...@googlegroups.com
>>>> >>> To leave this group, send email to vintage-macs...@googlegroups.com
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Re: Macintosh 12" RGB Display M1296G owners please help [message #363918 is a reply to message #362281] Tue, 20 February 2018 06:05 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
ohm.

I think I have measured this one and it's more like 160K 1%. Maybe you
could measure it in-circuit? I will do the same with 160K resistor soldered
in and compare the results. That's the biggest difference between my
measurements and your readings so far, so it would be nice to double check
it.

W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
Stickman napisał:
>
> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.
>
> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com <javascript:>>
> wrote:
>
>> Added to the folder - in case colors aren't visible, here are resistor
>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>> look like a 1% metal film:
>>
>> R919 10K (Brown Black Orange)
>> R920 47K (Red Violet Orange)
>> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
>> read)
>> R523 12K (Brown Red Orange)
>> R423 68K (Blue Grey Black Red 1% metal film)
>> R506 6K8 (Blue Grey Red)
>>
>> Let me know if you need anything else, I didn't have more than a few
>> minutes today.
>>
>> I'd bet the only real difference between the US & European model is in
>> the line voltage power supply side of the board and the rest is pretty
>> similar. There's a photo of the entire board and one of just the signals/HV
>> side.
>> For future searchers: I will upload these all to flickr or imgur as well
>> and post the link, as I won't keep them in dropbox forever.
>>
>>
>>
>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl <javascript:>>
>> wrote:
>>
>>>> > is yours also a US model or an international?
>>>
>>> It's an european one. Seems like there are some differences between our
>>> models. Still, I'd like to see a few close shots of your board.
>>>
>>> So if you could take a pic of the following elements, that would be
>>> great. To make it easier, I'm gonna tell you rough directions (my board is
>>> facing the flyback down, so the CRT is on my right hand side) and their
>>> orientation.
>>>
>>> R919, R920 - two small ones, center right (under the CRT neck) in close
>>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>>> vertical
>>> R521 - near the flyback transformer, slightly above and on the left;
>>> horizontal
>>> R523 - slightly lower than the previous one; horizontal
>>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>>> R506 - far bottom left, above H-hold pot; horizontal
>>>
>>> Those are the troublesome ones. Please take a picture of the underside
>>> of the board - even if they are slightly different, I should be able to
>>> figure out the differences by looking at the connections.
>>>
>>> Many thanks.
>>> Mateusz
>>>
>>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>>> Stickman napisał:
>>>>
>>>> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>>>> model or an international? Some photos linked below, I can pull the boards
>>>> out if needed.
>>>>
>>>>
>>>> https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc H_zyi40a?dl=0
>>>> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>>>
>>>> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>>>
>>>> > Oh, that would be great. If you don't mind, I'd tell you which
>>>> > close-ups I need the most.
>>>> >
>>>> > BR,
>>>> > Mateusz
>>>> >
>>>> > W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The
>>>> > One True Stickman napisał:
>>>> >>
>>>> >> I think I have this monitor, but will have to dig it out of the
>>>> >> closet to check. If my memory is correct I'd be happy to grab some photos
>>>> >> in the next couple days
>>>> >>
>>>> >> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >>
>>>> >>> Hello there,
>>>> >>>
>>>> >>> some time ago I got my first Mac ever - an LCII with a 12" RGB
>>>> >>> Monitor. The whole setup was stored in a moist basement and unfortunately
>>>> >>> somebody has spilled some washing powder all over it. It turns out that
>>>> >>> this stuff is even more corrosive than battery acid. The computer itself
>>>> >>> was in a relative good condition. I had to replace some components, repair
>>>> >>> two broken traces and give it a good clean and after that it happens to
>>>> >>> work just fine.
>>>> >>>
>>>> >>> The monitor is a different story. It was very badly corroded,
>>>> >>> especially resistors were covered with rust. I have desoldered all of them
>>>> >>> but a few of them were faulty and I couldn't measure their values. Color
>>>> >>> bars were either washed out or totally covered with rust. I have figured
>>>> >>> out most of them but I still have some pure guesses. There's no (useful)
>>>> >>> service manual or schematic I could use.
>>>> >>>
>>>> >>> Before anybody tells me no to bother - I know that this stuff is
>>>> >>> neither vintage nor rare, but I'm really having fun trying to rescue old
>>>> >>> hardware. Right now I'm at the point where the PCB is totally emptied of
>>>> >>> any parts and once I fix the traces and cover them back with solder mask, I
>>>> >>> will start re-populating the board.
>>>> >>>
>>>> >>> TL;DR - is there anybody out there willing to disassemble his M1296G
>>>> >>> and take a few photos of the main board?
>>>> >>>
>>>> >>> Thanks a lot.
>>>> >>>
>>>> >>> BR,
>>>> >>> Mateusz
>>>> >>>
>>>> >>> --
>>>> >>> --
>>>> >>> -----
>>>> >>> You received this message because you are a member of the Vintage
>>>> >>> Macs group.
>>>> >>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and
>>>> >>> our netiquette guide is at
>>>> >>> http://www.lowendmac.com/lists/netiquette.shtml
>>>> >>> To post to this group, send email to vintag...@googlegroups.com
>>>> >>> To leave this group, send email to vintage-macs...@googlegroups.com
>>>> >>> For more options, visit this group at
>>>> >>> http://groups.google.com/group/vintage-macs
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>>>> >>>
>>>> >>
>>>> >> --
>>>> > --
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>>>> >
>>>>
>>>> --
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>>
>>
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Re: Macintosh 12" RGB Display M1296G owners please help [message #363936 is a reply to message #363918] Tue, 20 February 2018 15:58 Go to previous messageGo to next message
The One True Stickman is currently offline  The One True Stickman
Messages: 85
Registered: April 2013
Karma: 0
Member
Yes, Keith also measured this one at 160K after I posted my initial list.
Out-of-circuit test confirms 160K, so there's a triple-check!

On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zgba@o2.pl> wrote:

>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
> ohm.
>
> I think I have measured this one and it's more like 160K 1%. Maybe you
> could measure it in-circuit? I will do the same with 160K resistor soldered
> in and compare the results. That's the biggest difference between my
> measurements and your readings so far, so it would be nice to double check
> it.
>
> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
> Stickman napisał:
>>
>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>>
>>> Added to the folder - in case colors aren't visible, here are resistor
>>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>>> look like a 1% metal film:
>>>
>>> R919 10K (Brown Black Orange)
>>> R920 47K (Red Violet Orange)
>>> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
>>> read)
>>> R523 12K (Brown Red Orange)
>>> R423 68K (Blue Grey Black Red 1% metal film)
>>> R506 6K8 (Blue Grey Red)
>>>
>>> Let me know if you need anything else, I didn't have more than a few
>>> minutes today.
>>>
>>> I'd bet the only real difference between the US & European model is in
>>> the line voltage power supply side of the board and the rest is pretty
>>> similar. There's a photo of the entire board and one of just the signals/HV
>>> side.
>>> For future searchers: I will upload these all to flickr or imgur as well
>>> and post the link, as I won't keep them in dropbox forever.
>>>
>>>
>>>
>>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>>>
>>>> >> is yours also a US model or an international?
>>>>
>>>> It's an european one. Seems like there are some differences between our
>>>> models. Still, I'd like to see a few close shots of your board.
>>>>
>>>> So if you could take a pic of the following elements, that would be
>>>> great. To make it easier, I'm gonna tell you rough directions (my board is
>>>> facing the flyback down, so the CRT is on my right hand side) and their
>>>> orientation.
>>>>
>>>> R919, R920 - two small ones, center right (under the CRT neck) in close
>>>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>>>> vertical
>>>> R521 - near the flyback transformer, slightly above and on the left;
>>>> horizontal
>>>> R523 - slightly lower than the previous one; horizontal
>>>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>>>> R506 - far bottom left, above H-hold pot; horizontal
>>>>
>>>> Those are the troublesome ones. Please take a picture of the underside
>>>> of the board - even if they are slightly different, I should be able to
>>>> figure out the differences by looking at the connections.
>>>>
>>>> Many thanks.
>>>> Mateusz
>>>>
>>>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>>>> Stickman napisał:
>>>> >
>>>> > Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>>>> > model or an international? Some photos linked below, I can pull the boards
>>>> > out if needed.
>>>> >
>>>> > https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc
>>>> > H_zyi40a?dl=0
>>>> > < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>>> >
>>>> > On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >
>>>> >> Oh, that would be great. If you don't mind, I'd tell you which
>>>> >> close-ups I need the most.
>>>> >>
>>>> >> BR,
>>>> >> Mateusz
>>>> >>
>>>> >> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The
>>>> >> One True Stickman napisał:
>>>> >>>
>>>> >>> I think I have this monitor, but will have to dig it out of the
>>>> >>> closet to check. If my memory is correct I'd be happy to grab some photos
>>>> >>> in the next couple days
>>>> >>>
>>>> >>> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >>>
>>>> >>>> Hello there,
>>>> >>>>
>>>> >>>> some time ago I got my first Mac ever - an LCII with a 12" RGB
>>>> >>>> Monitor. The whole setup was stored in a moist basement and unfortunately
>>>> >>>> somebody has spilled some washing powder all over it. It turns out that
>>>> >>>> this stuff is even more corrosive than battery acid. The computer itself
>>>> >>>> was in a relative good condition. I had to replace some components, repair
>>>> >>>> two broken traces and give it a good clean and after that it happens to
>>>> >>>> work just fine.
>>>> >>>>
>>>> >>>> The monitor is a different story. It was very badly corroded,
>>>> >>>> especially resistors were covered with rust. I have desoldered all of them
>>>> >>>> but a few of them were faulty and I couldn't measure their values. Color
>>>> >>>> bars were either washed out or totally covered with rust. I have figured
>>>> >>>> out most of them but I still have some pure guesses. There's no (useful)
>>>> >>>> service manual or schematic I could use.
>>>> >>>>
>>>> >>>> Before anybody tells me no to bother - I know that this stuff is
>>>> >>>> neither vintage nor rare, but I'm really having fun trying to rescue old
>>>> >>>> hardware. Right now I'm at the point where the PCB is totally emptied of
>>>> >>>> any parts and once I fix the traces and cover them back with solder mask, I
>>>> >>>> will start re-populating the board.
>>>> >>>>
>>>> >>>> TL;DR - is there anybody out there willing to disassemble his
>>>> >>>> M1296G and take a few photos of the main board?
>>>> >>>>
>>>> >>>> Thanks a lot.
>>>> >>>>
>>>> >>>> BR,
>>>> >>>> Mateusz
>>>> >>>>
>>>> >>>> --
>>>> >>>> --
>>>> >>>> -----
>>>> >>>> You received this message because you are a member of the Vintage
>>>> >>>> Macs group.
>>>> >>>> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml
>>>> >>>> and our netiquette guide is at http://www.lowendmac.com/lists
>>>> >>>> /netiquette.shtml
>>>> >>>> To post to this group, send email to vintag...@googlegroups.com
>>>> >>>> To leave this group, send email to vintage-macs...@googlegroups.com
>>>> >>>> For more options, visit this group at
>>>> >>>> http://groups.google.com/group/vintage-macs
>>>> >>>>
>>>> >>>> Support for older Macs: http://lowendmac.com/services/
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>>>> >>>> send an email to vintage-macs...@googlegroups.com.
>>>> >>>> For more options, visit https://groups.google.com/d/optout.
>>>> >>>>
>>>> >>>
>>>> >>> --
>>>> >> --
>>>> >> -----
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>>>> >> Macs group.
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>>>> >> our netiquette guide is at http://www.lowendmac.com/lists
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>>>> >
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>>>
>>>
>> --
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364036 is a reply to message #363936] Thu, 22 February 2018 14:10 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
Hi Guys,

the main board is pretty much complete now. I'm only missing a few parts
now. I'd like to ask you to double check those two resistors:

R423 - my initial guess (I don't remember if I measured it or read the
stripes) was 6,8K, but you guys say it's 68K
R506 - the other way round - in my sheet it's 68K, not 6,8K

Additionally I'm not 100% sure if I got those power resistors right:

R419, R526 - 1,2 ohm
R511, R514 - 10 ohm
R911 - 0,33 ohm

Hopefully I got it all right. Keep the fingers crossed.

Cheers,
Mateusz

W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True
Stickman napisał:
>
> Yes, Keith also measured this one at 160K after I posted my initial list.
> Out-of-circuit test confirms 160K, so there's a triple-check!
>
> On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl <javascript:>> wrote:
>
>>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> I think I have measured this one and it's more like 160K 1%. Maybe you
>> could measure it in-circuit? I will do the same with 160K resistor soldered
>> in and compare the results. That's the biggest difference between my
>> measurements and your readings so far, so it would be nice to double check
>> it.
>>
>> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
>> Stickman napisał:
>>>
>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>>> ohm.
>>>
>>> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>>>
>>>> Added to the folder - in case colors aren't visible, here are resistor
>>>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>>>> look like a 1% metal film:
>>>>
>>>> R919 10K (Brown Black Orange)
>>>> R920 47K (Red Violet Orange)
>>>> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard
>>>> to read)
>>>> R523 12K (Brown Red Orange)
>>>> R423 68K (Blue Grey Black Red 1% metal film)
>>>> R506 6K8 (Blue Grey Red)
>>>>
>>>> Let me know if you need anything else, I didn't have more than a few
>>>> minutes today.
>>>>
>>>> I'd bet the only real difference between the US & European model is in
>>>> the line voltage power supply side of the board and the rest is pretty
>>>> similar. There's a photo of the entire board and one of just the signals/HV
>>>> side.
>>>> For future searchers: I will upload these all to flickr or imgur as
>>>> well and post the link, as I won't keep them in dropbox forever.
>>>>
>>>>
>>>>
>>>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>>>>
>>>> > >> is yours also a US model or an international?
>>>> >
>>>> > It's an european one. Seems like there are some differences between
>>>> > our models. Still, I'd like to see a few close shots of your board.
>>>> >
>>>> > So if you could take a pic of the following elements, that would be
>>>> > great. To make it easier, I'm gonna tell you rough directions (my board is
>>>> > facing the flyback down, so the CRT is on my right hand side) and their
>>>> > orientation.
>>>> >
>>>> > R919, R920 - two small ones, center right (under the CRT neck) in
>>>> > close proximity of Q905 transistor (with a big heat sink) and two blue disc
>>>> > caps; vertical
>>>> > R521 - near the flyback transformer, slightly above and on the left;
>>>> > horizontal
>>>> > R523 - slightly lower than the previous one; horizontal
>>>> > R423 - left to the J501 (vertical connector, lots of wires); horizontal
>>>> > R506 - far bottom left, above H-hold pot; horizontal
>>>> >
>>>> > Those are the troublesome ones. Please take a picture of the underside
>>>> > of the board - even if they are slightly different, I should be able to
>>>> > figure out the differences by looking at the connections.
>>>> >
>>>> > Many thanks.
>>>> > Mateusz
>>>> >
>>>> > W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>>>> > Stickman napisał:
>>>> >>
>>>> >> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>>>> >> model or an international? Some photos linked below, I can pull the boards
>>>> >> out if needed.
>>>> >>
>>>> >>
>>>> >> https://www.dropbox.com/sh/9s390k8gcva62e4/AABptFdkwVknxSDRc H_zyi40a?dl=0
>>>> >> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>>> >>
>>>> >> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >>
>>>> >>> Oh, that would be great. If you don't mind, I'd tell you which
>>>> >>> close-ups I need the most.
>>>> >>>
>>>> >>> BR,
>>>> >>> Mateusz
>>>> >>>
>>>> >>> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The
>>>> >>> One True Stickman napisał:
>>>> >>>>
>>>> >>>> I think I have this monitor, but will have to dig it out of the
>>>> >>>> closet to check. If my memory is correct I'd be happy to grab some photos
>>>> >>>> in the next couple days
>>>> >>>>
>>>> >>>> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>>> >>>>
>>>> >>>>> Hello there,
>>>> >>>>>
>>>> >>>>> some time ago I got my first Mac ever - an LCII with a 12" RGB
>>>> >>>>> Monitor. The whole setup was stored in a moist basement and unfortunately
>>>> >>>>> somebody has spilled some washing powder all over it. It turns out that
>>>> >>>>> this stuff is even more corrosive than battery acid. The computer itself
>>>> >>>>> was in a relative good condition. I had to replace some components, repair
>>>> >>>>> two broken traces and give it a good clean and after that it happens to
>>>> >>>>> work just fine.
>>>> >>>>>
>>>> >>>>> The monitor is a different story. It was very badly corroded,
>>>> >>>>> especially resistors were covered with rust. I have desoldered all of them
>>>> >>>>> but a few of them were faulty and I couldn't measure their values. Color
>>>> >>>>> bars were either washed out or totally covered with rust. I have figured
>>>> >>>>> out most of them but I still have some pure guesses. There's no (useful)
>>>> >>>>> service manual or schematic I could use.
>>>> >>>>>
>>>> >>>>> Before anybody tells me no to bother - I know that this stuff is
>>>> >>>>> neither vintage nor rare, but I'm really having fun trying to rescue old
>>>> >>>>> hardware. Right now I'm at the point where the PCB is totally emptied of
>>>> >>>>> any parts and once I fix the traces and cover them back with solder mask, I
>>>> >>>>> will start re-populating the board.
>>>> >>>>>
>>>> >>>>> TL;DR - is there anybody out there willing to disassemble his
>>>> >>>>> M1296G and take a few photos of the main board?
>>>> >>>>>
>>>> >>>>> Thanks a lot.
>>>> >>>>>
>>>> >>>>> BR,
>>>> >>>>> Mateusz
>>>> >>>>>
>>>> >>>>> --
>>>> >>>>> --
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>>>> >>>>> Macs group.
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364209 is a reply to message #364036] Fri, 23 February 2018 12:59 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
Senior Member
Mateusz,
I have metered the following resistors, out of circuit.
R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R911 - Printed 0.33R -  Measured 00.3R (I don't have a lower scale for additional decimal places)
Hope this helps ,
Cheers,
Keith
On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zgba@o2.pl> wrote:

Hi Guys,
the main board is pretty much complete now. I'm only missing a few parts now. I'd like to ask you to double check those two resistors:
R423 - my initial guess (I don't remember if I measured it or read the stripes) was 6,8K, but you guys say it's 68KR506 - the other way round - in my sheet it's 68K, not 6,8K
Additionally I'm not 100% sure if I got those power resistors right:
R419, R526 - 1,2 ohmR511, R514 - 10 ohmR911 - 0,33 ohm
Hopefully I got it all right. Keep the fingers crossed.
Cheers,Mateusz
W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True Stickman napisał:
Yes, Keith also measured this one at 160K after I posted my initial list. Out-of-circuit test confirms 160K, so there's a triple-check!

On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:

>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm. 
I think I have measured this one and it's more like 160K 1%. Maybe you could measure it in-circuit? I will do the same with 160K resistor soldered in and compare the results. That's the biggest difference between my measurements and your readings so far, so it would be nice to double check it.

W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True Stickman napisał:
Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.

On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:

Added to the folder - in case colors aren't visible, here are resistor codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which look like a 1% metal film:

R919 10K (Brown Black Orange)
R920 47K (Red Violet Orange)
R521 86ohm?  (Violet Blue Black Gold 1% metal film - this one is hard to read)
R523 12K (Brown Red Orange)
R423 68K (Blue Grey Black Red 1% metal film)
R506 6K8 (Blue Grey Red)

Let me know if you need anything else, I didn't have more than a few minutes today.

I'd bet the only real difference between the US & European model is in the line voltage power supply side of the board and the rest is pretty similar. There's a photo of the entire board and one of just the signals/HV side.
For future searchers: I will upload these all to flickr or imgur as well and post the link, as I won't keep them in dropbox forever. 



On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:

>>   is yours also a US model or an international?

It's an european one. Seems like there are some differences between our models. Still, I'd like to see a few close shots of your board.
So if you could take a pic of the following elements, that would be great. To make it easier, I'm gonna tell you rough directions (my board is facing the flyback down, so the CRT is on my right hand side) and their orientation.
R919, R920 - two small ones, center right (under the CRT neck) in close proximity of Q905 transistor (with a big heat sink) and two blue disc caps; verticalR521 - near the flyback transformer, slightly above and on the left; horizontalR523 - slightly lower than the previous one; horizontalR423 - left to the J501 (vertical connector, lots of wires); horizontalR506 - far bottom left, above H-hold pot; horizontal
Those are the troublesome ones. Please take a picture of the underside of the board - even if they are slightly different, I should be able to figure out the differences by looking at the connections.
Many thanks.Mateusz
W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True Stickman napisał:
Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US model or an international? Some photos linked below, I can pull the boards out if needed. 

https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0

On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:

Oh, that would be great. If you don't mind, I'd tell you which close-ups I need the most.
BR,Mateusz

W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One True Stickman napisał:
I think I have this monitor, but will have to dig it out of the closet to check. If my memory is correct I'd be happy to grab some photos in the next couple days

On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:

Hello there,
some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor. The whole setup was stored in a moist basement and unfortunately somebody has spilled some washing powder all over it. It turns out that this stuff is even more corrosive than battery acid. The computer itself was in a relative good condition. I had to replace some components, repair two broken traces and give it a good clean and after that it happens to work just fine.
The monitor is a different story. It was very badly corroded, especially resistors were covered with rust. I have desoldered all of them but a few of them were faulty and I couldn't measure their values. Color bars were either washed out or totally covered with rust. I have figured out most of them but I still have some pure guesses. There's no (useful) service manual or schematic I could use.
Before anybody tells me no to bother - I know that this stuff is neither vintage nor rare, but I'm really having fun trying to rescue old hardware. Right now I'm at the point where the PCB is totally emptied of any parts and once I fix the traces and cover them back with solder mask, I will start re-populating the board.
TL;DR - is there anybody out there willing to disassemble his M1296G and take a few photos of the main board?
Thanks a lot.
BR,Mateusz

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Re: Macintosh 12" RGB Display M1296G owners please help [message #364782 is a reply to message #364209] Sat, 03 March 2018 09:55 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
Hi Guys,

I managed to rebuild the board and despite my curiosity wants me to power
this thing on immediately to see if it works, I'd like to check those last
resistors to be sure that I won't damage the circuitry. Here it goes:

R523 - 12k, my guess was 22k
R919 - 10k, my guess was 56k
R920 - 47k, my guess was 27k

Please check them for me, and let's see if it powers up:) In the meantime I
will clean the rest of wires, connectors etc. and start writing my story :)
If you confirm those values I will publish my sheet where I have written
down most of the parts (without inductors, transformers etc) and their
values. The schematic is on its way.

Cheers,
Mateusz

W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman
napisał:
>
> Mateusz,
>
> I have metered the following resistors, out of circuit.
>
> R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
>
> R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
>
> R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>
> R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>
> R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>
> R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>
> R911 - Printed 0.33R - Measured 00.3R (I don't have a lower scale for
> additional decimal places)
>
> Hope this helps ,
>
> Cheers,
>
> Keith
>
> On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl
> <javascript:>> wrote:
>
>
> Hi Guys,
>
> the main board is pretty much complete now. I'm only missing a few parts
> now. I'd like to ask you to double check those two resistors:
>
> R423 - my initial guess (I don't remember if I measured it or read the
> stripes) was 6,8K, but you guys say it's 68K
> R506 - the other way round - in my sheet it's 68K, not 6,8K
>
> Additionally I'm not 100% sure if I got those power resistors right:
>
> R419, R526 - 1,2 ohm
> R511, R514 - 10 ohm
> R911 - 0,33 ohm
>
> Hopefully I got it all right. Keep the fingers crossed.
>
> Cheers,
> Mateusz
>
> W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Yes, Keith also measured this one at 160K after I posted my initial list.
> Out-of-circuit test confirms 160K, so there's a triple-check!
>
> On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:
>
>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
> ohm.
>
> I think I have measured this one and it's more like 160K 1%. Maybe you
> could measure it in-circuit? I will do the same with 160K resistor soldered
> in and compare the results. That's the biggest difference between my
> measurements and your readings so far, so it would be nice to double check
> it.
>
> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.
>
> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>
> Added to the folder - in case colors aren't visible, here are resistor
> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
> look like a 1% metal film:
>
> R919 10K (Brown Black Orange)
> R920 47K (Red Violet Orange)
> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
> read)
> R523 12K (Brown Red Orange)
> R423 68K (Blue Grey Black Red 1% metal film)
> R506 6K8 (Blue Grey Red)
>
> Let me know if you need anything else, I didn't have more than a few
> minutes today.
>
> I'd bet the only real difference between the US & European model is in the
> line voltage power supply side of the board and the rest is pretty similar.
> There's a photo of the entire board and one of just the signals/HV side.
> For future searchers: I will upload these all to flickr or imgur as well
> and post the link, as I won't keep them in dropbox forever.
>
>
>
> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>
>>> is yours also a US model or an international?
>
> It's an european one. Seems like there are some differences between our
> models. Still, I'd like to see a few close shots of your board.
>
> So if you could take a pic of the following elements, that would be great.
> To make it easier, I'm gonna tell you rough directions (my board is facing
> the flyback down, so the CRT is on my right hand side) and their
> orientation.
>
> R919, R920 - two small ones, center right (under the CRT neck) in close
> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
> vertical
> R521 - near the flyback transformer, slightly above and on the left;
> horizontal
> R523 - slightly lower than the previous one; horizontal
> R423 - left to the J501 (vertical connector, lots of wires); horizontal
> R506 - far bottom left, above H-hold pot; horizontal
>
> Those are the troublesome ones. Please take a picture of the underside of
> the board - even if they are slightly different, I should be able to figure
> out the differences by looking at the connections.
>
> Many thanks.
> Mateusz
>
> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
> model or an international? Some photos linked below, I can pull the boards
> out if needed.
>
> https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0
> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>
> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>
> Oh, that would be great. If you don't mind, I'd tell you which close-ups I
> need the most.
>
> BR,
> Mateusz
>
> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One
> True Stickman napisał:
>
> I think I have this monitor, but will have to dig it out of the closet to
> check. If my memory is correct I'd be happy to grab some photos in the next
> couple days
>
> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>
> Hello there,
>
> some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor.
> The whole setup was stored in a moist basement and unfortunately somebody
> has spilled some washing powder all over it. It turns out that this stuff
> is even more corrosive than battery acid. The computer itself was in a
> relative good condition. I had to replace some components, repair two
> broken traces and give it a good clean and after that it happens to work
> just fine.
>
> The monitor is a different story. It was very badly corroded, especially
> resistors were covered with rust. I have desoldered all of them but a few
> of them were faulty and I couldn't measure their values. Color bars were
> either washed out or totally covered with rust. I have figured out most of
> them but I still have some pure guesses. There's no (useful) service manual
> or schematic I could use.
>
> Before anybody tells me no to bother - I know that this stuff is neither
> vintage nor rare, but I'm really having fun trying to rescue old hardware.
> Right now I'm at the point where the PCB is totally emptied of any parts
> and once I fix the traces and cover them back with solder mask, I will
> start re-populating the board.
>
> TL;DR - is there anybody out there willing to disassemble his M1296G and
> take a few photos of the main board?
>
> Thanks a lot.
>
> BR,
> Mateusz
>
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> --
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364783 is a reply to message #364782] Sat, 03 March 2018 14:24 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
OK, if you didn't check those resistors yet - don't bother. I couldn't
resist and turned the monitor on. Sadly, it doesn't work. After powering it
up the degaussing coil maks its cycle and then only the faint noise is to
be heard (vertical sweep?). Right now my guess is that the flyback
transformer doesn't generate the high voltage, cause there's no "pop" when
I try to discharge the crt. Well, looks like more troubleshooting to me...

W dniu sobota, 3 marca 2018 15:55:11 UTC+1 użytkownik zgbapl napisał:
>
> Hi Guys,
>
> I managed to rebuild the board and despite my curiosity wants me to power
> this thing on immediately to see if it works, I'd like to check those last
> resistors to be sure that I won't damage the circuitry. Here it goes:
>
> R523 - 12k, my guess was 22k
> R919 - 10k, my guess was 56k
> R920 - 47k, my guess was 27k
>
> Please check them for me, and let's see if it powers up:) In the meantime
> I will clean the rest of wires, connectors etc. and start writing my story
> :) If you confirm those values I will publish my sheet where I have written
> down most of the parts (without inductors, transformers etc) and their
> values. The schematic is on its way.
>
> Cheers,
> Mateusz
>
> W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman
> napisał:
>>
>> Mateusz,
>>
>> I have metered the following resistors, out of circuit.
>>
>> R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
>>
>> R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
>>
>> R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>>
>> R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>>
>> R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>>
>> R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>>
>> R911 - Printed 0.33R - Measured 00.3R (I don't have a lower scale for
>> additional decimal places)
>>
>> Hope this helps ,
>>
>> Cheers,
>>
>> Keith
>>
>> On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:
>>
>>
>> Hi Guys,
>>
>> the main board is pretty much complete now. I'm only missing a few parts
>> now. I'd like to ask you to double check those two resistors:
>>
>> R423 - my initial guess (I don't remember if I measured it or read the
>> stripes) was 6,8K, but you guys say it's 68K
>> R506 - the other way round - in my sheet it's 68K, not 6,8K
>>
>> Additionally I'm not 100% sure if I got those power resistors right:
>>
>> R419, R526 - 1,2 ohm
>> R511, R514 - 10 ohm
>> R911 - 0,33 ohm
>>
>> Hopefully I got it all right. Keep the fingers crossed.
>>
>> Cheers,
>> Mateusz
>>
>> W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Yes, Keith also measured this one at 160K after I posted my initial list.
>> Out-of-circuit test confirms 160K, so there's a triple-check!
>>
>> On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:
>>
>>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> I think I have measured this one and it's more like 160K 1%. Maybe you
>> could measure it in-circuit? I will do the same with 160K resistor soldered
>> in and compare the results. That's the biggest difference between my
>> measurements and your readings so far, so it would be nice to double check
>> it.
>>
>> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>>
>> Added to the folder - in case colors aren't visible, here are resistor
>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>> look like a 1% metal film:
>>
>> R919 10K (Brown Black Orange)
>> R920 47K (Red Violet Orange)
>> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
>> read)
>> R523 12K (Brown Red Orange)
>> R423 68K (Blue Grey Black Red 1% metal film)
>> R506 6K8 (Blue Grey Red)
>>
>> Let me know if you need anything else, I didn't have more than a few
>> minutes today.
>>
>> I'd bet the only real difference between the US & European model is in
>> the line voltage power supply side of the board and the rest is pretty
>> similar. There's a photo of the entire board and one of just the signals/HV
>> side.
>> For future searchers: I will upload these all to flickr or imgur as well
>> and post the link, as I won't keep them in dropbox forever.
>>
>>
>>
>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>>
>>>> is yours also a US model or an international?
>>
>> It's an european one. Seems like there are some differences between our
>> models. Still, I'd like to see a few close shots of your board.
>>
>> So if you could take a pic of the following elements, that would be
>> great. To make it easier, I'm gonna tell you rough directions (my board is
>> facing the flyback down, so the CRT is on my right hand side) and their
>> orientation.
>>
>> R919, R920 - two small ones, center right (under the CRT neck) in close
>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>> vertical
>> R521 - near the flyback transformer, slightly above and on the left;
>> horizontal
>> R523 - slightly lower than the previous one; horizontal
>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>> R506 - far bottom left, above H-hold pot; horizontal
>>
>> Those are the troublesome ones. Please take a picture of the underside of
>> the board - even if they are slightly different, I should be able to figure
>> out the differences by looking at the connections.
>>
>> Many thanks.
>> Mateusz
>>
>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>> model or an international? Some photos linked below, I can pull the boards
>> out if needed.
>>
>> https://www.dropbox.com/sh/ 9s390k8gcva62e4/
>> AABptFdkwVknxSDRcH_zyi40a?dl=0
>> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>
>> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>
>> Oh, that would be great. If you don't mind, I'd tell you which close-ups
>> I need the most.
>>
>> BR,
>> Mateusz
>>
>> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One
>> True Stickman napisał:
>>
>> I think I have this monitor, but will have to dig it out of the closet to
>> check. If my memory is correct I'd be happy to grab some photos in the next
>> couple days
>>
>> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>
>> Hello there,
>>
>> some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor.
>> The whole setup was stored in a moist basement and unfortunately somebody
>> has spilled some washing powder all over it. It turns out that this stuff
>> is even more corrosive than battery acid. The computer itself was in a
>> relative good condition. I had to replace some components, repair two
>> broken traces and give it a good clean and after that it happens to work
>> just fine.
>>
>> The monitor is a different story. It was very badly corroded, especially
>> resistors were covered with rust. I have desoldered all of them but a few
>> of them were faulty and I couldn't measure their values. Color bars were
>> either washed out or totally covered with rust. I have figured out most of
>> them but I still have some pure guesses. There's no (useful) service manual
>> or schematic I could use.
>>
>> Before anybody tells me no to bother - I know that this stuff is neither
>> vintage nor rare, but I'm really having fun trying to rescue old hardware.
>> Right now I'm at the point where the PCB is totally emptied of any parts
>> and once I fix the traces and cover them back with solder mask, I will
>> start re-populating the board.
>>
>> TL;DR - is there anybody out there willing to disassemble his M1296G and
>> take a few photos of the main board?
>>
>> Thanks a lot.
>>
>> BR,
>> Mateusz
>>
>> --
>> --
>> -----
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>> group.
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364800 is a reply to message #364783] Sun, 04 March 2018 08:07 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
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Mateusz,
Keep at it. Have you tested the expected voltages at the various test points on the circuit boards? 
Also, you may have to test continuity between pads in case of hairline cracks in the tracks.
<fingers crossed>
Keith
On Saturday, 3 March 2018, 19:24:54 GMT, zgbapl <zgba@o2.pl> wrote:

OK, if you didn't check those resistors yet - don't bother. I couldn't resist and turned the monitor on. Sadly, it doesn't work. After powering it up the degaussing coil maks its cycle and then only the faint noise is to be heard (vertical sweep?). Right now my guess is that the flyback transformer doesn't generate the high voltage, cause there's no "pop" when I try to discharge the crt. Well, looks like more troubleshooting to me...

W dniu sobota, 3 marca 2018 15:55:11 UTC+1 użytkownik zgbapl napisał:
Hi Guys,
I managed to rebuild the board and despite my curiosity wants me to power this thing on immediately to see if it works, I'd like to check those last resistors to be sure that I won't damage the circuitry. Here it goes:
R523 - 12k, my guess was 22kR919 - 10k, my guess was 56kR920 - 47k, my guess was 27k
Please check them for me, and let's see if it powers up:) In the meantime I will clean the rest of wires, connectors etc. and start writing my story :) If you confirm those values I will publish my sheet where I have written down most of the parts (without inductors, transformers etc) and their values. The schematic is on its way.
Cheers,Mateusz

W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman napisał:
Mateusz,
I have metered the following resistors, out of circuit.
R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R911 - Printed 0.33R -  Measured 00.3R (I don't have a lower scale for additional decimal places)
Hope this helps ,
Cheers,
Keith
On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:

Hi Guys,
the main board is pretty much complete now. I'm only missing a few parts now. I'd like to ask you to double check those two resistors:
R423 - my initial guess (I don't remember if I measured it or read the stripes) was 6,8K, but you guys say it's 68KR506 - the other way round - in my sheet it's 68K, not 6,8K
Additionally I'm not 100% sure if I got those power resistors right:
R419, R526 - 1,2 ohmR511, R514 - 10 ohmR911 - 0,33 ohm
Hopefully I got it all right. Keep the fingers crossed.
Cheers,Mateusz
W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True Stickman napisał:
Yes, Keith also measured this one at 160K after I posted my initial list. Out-of-circuit test confirms 160K, so there's a triple-check!

On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:

>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm. 
I think I have measured this one and it's more like 160K 1%. Maybe you could measure it in-circuit? I will do the same with 160K resistor soldered in and compare the results. That's the biggest difference between my measurements and your readings so far, so it would be nice to double check it.

W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True Stickman napisał:
Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.

On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:

Added to the folder - in case colors aren't visible, here are resistor codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which look like a 1% metal film:

R919 10K (Brown Black Orange)
R920 47K (Red Violet Orange)
R521 86ohm?  (Violet Blue Black Gold 1% metal film - this one is hard to read)
R523 12K (Brown Red Orange)
R423 68K (Blue Grey Black Red 1% metal film)
R506 6K8 (Blue Grey Red)

Let me know if you need anything else, I didn't have more than a few minutes today.

I'd bet the only real difference between the US & European model is in the line voltage power supply side of the board and the rest is pretty similar. There's a photo of the entire board and one of just the signals/HV side.
For future searchers: I will upload these all to flickr or imgur as well and post the link, as I won't keep them in dropbox forever. 



On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:

>>   is yours also a US model or an international?

It's an european one. Seems like there are some differences between our models. Still, I'd like to see a few close shots of your board.
So if you could take a pic of the following elements, that would be great. To make it easier, I'm gonna tell you rough directions (my board is facing the flyback down, so the CRT is on my right hand side) and their orientation.
R919, R920 - two small ones, center right (under the CRT neck) in close proximity of Q905 transistor (with a big heat sink) and two blue disc caps; verticalR521 - near the flyback transformer, slightly above and on the left; horizontalR523 - slightly lower than the previous one; horizontalR423 - left to the J501 (vertical connector, lots of wires); horizontalR506 - far bottom left, above H-hold pot; horizontal
Those are the troublesome ones. Please take a picture of the underside of the board - even if they are slightly different, I should be able to figure out the differences by looking at the connections.
Many thanks.Mateusz
W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True Stickman napisał:
Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US model or an international? Some photos linked below, I can pull the boards out if needed. 

https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0

On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:

Oh, that would be great. If you don't mind, I'd tell you which close-ups I need the most.
BR,Mateusz

W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One True Stickman napisał:
I think I have this monitor, but will have to dig it out of the closet to check. If my memory is correct I'd be happy to grab some photos in the next couple days

On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:

Hello there,
some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor. The whole setup was stored in a moist basement and unfortunately somebody has spilled some washing powder all over it. It turns out that this stuff is even more corrosive than battery acid. The computer itself was in a relative good condition. I had to replace some components, repair two broken traces and give it a good clean and after that it happens to work just fine.
The monitor is a different story. It was very badly corroded, especially resistors were covered with rust. I have desoldered all of them but a few of them were faulty and I couldn't measure their values. Color bars were either washed out or totally covered with rust. I have figured out most of them but I still have some pure guesses. There's no (useful) service manual or schematic I could use.
Before anybody tells me no to bother - I know that this stuff is neither vintage nor rare, but I'm really having fun trying to rescue old hardware. Right now I'm at the point where the PCB is totally emptied of any parts and once I fix the traces and cover them back with solder mask, I will start re-populating the board.
TL;DR - is there anybody out there willing to disassemble his M1296G and take a few photos of the main board?
Thanks a lot.
BR,Mateusz

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Re: Macintosh 12" RGB Display M1296G owners please help [message #364801 is a reply to message #364782] Sun, 04 March 2018 08:19 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
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Hi Mateusz,
Sorry, been away from the emails for a few days.
I have tested the following resistors out of circuit on my European board. Colours are as per my board.
R523 - Brown-Red-Orange - 1-2-000 - Measured 11.7k R919 - Brown-Black-Orange - 1-0-000 - Measured 9.7kR920 - Red-Violet-Orange - 2-7-000 - Measured 26.9k
Hope this helps,
Keith.
On Saturday, 3 March 2018, 14:55:15 GMT, zgbapl <zgba@o2.pl> wrote:

Hi Guys,
I managed to rebuild the board and despite my curiosity wants me to power this thing on immediately to see if it works, I'd like to check those last resistors to be sure that I won't damage the circuitry. Here it goes:
R523 - 12k, my guess was 22kR919 - 10k, my guess was 56kR920 - 47k, my guess was 27k
Please check them for me, and let's see if it powers up:) In the meantime I will clean the rest of wires, connectors etc. and start writing my story :) If you confirm those values I will publish my sheet where I have written down most of the parts (without inductors, transformers etc) and their values. The schematic is on its way.
Cheers,Mateusz

W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman napisał:
Mateusz,
I have metered the following resistors, out of circuit.
R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R911 - Printed 0.33R -  Measured 00.3R (I don't have a lower scale for additional decimal places)
Hope this helps ,
Cheers,
Keith
On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:

Hi Guys,
the main board is pretty much complete now. I'm only missing a few parts now. I'd like to ask you to double check those two resistors:
R423 - my initial guess (I don't remember if I measured it or read the stripes) was 6,8K, but you guys say it's 68KR506 - the other way round - in my sheet it's 68K, not 6,8K
Additionally I'm not 100% sure if I got those power resistors right:
R419, R526 - 1,2 ohmR511, R514 - 10 ohmR911 - 0,33 ohm
Hopefully I got it all right. Keep the fingers crossed.
Cheers,Mateusz
W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True Stickman napisał:
Yes, Keith also measured this one at 160K after I posted my initial list. Out-of-circuit test confirms 160K, so there's a triple-check!

On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:

>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm. 
I think I have measured this one and it's more like 160K 1%. Maybe you could measure it in-circuit? I will do the same with 160K resistor soldered in and compare the results. That's the biggest difference between my measurements and your readings so far, so it would be nice to double check it.

W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True Stickman napisał:
Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.

On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:

Added to the folder - in case colors aren't visible, here are resistor codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which look like a 1% metal film:

R919 10K (Brown Black Orange)
R920 47K (Red Violet Orange)
R521 86ohm?  (Violet Blue Black Gold 1% metal film - this one is hard to read)
R523 12K (Brown Red Orange)
R423 68K (Blue Grey Black Red 1% metal film)
R506 6K8 (Blue Grey Red)

Let me know if you need anything else, I didn't have more than a few minutes today.

I'd bet the only real difference between the US & European model is in the line voltage power supply side of the board and the rest is pretty similar. There's a photo of the entire board and one of just the signals/HV side.
For future searchers: I will upload these all to flickr or imgur as well and post the link, as I won't keep them in dropbox forever. 



On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:

>>   is yours also a US model or an international?

It's an european one. Seems like there are some differences between our models. Still, I'd like to see a few close shots of your board.
So if you could take a pic of the following elements, that would be great. To make it easier, I'm gonna tell you rough directions (my board is facing the flyback down, so the CRT is on my right hand side) and their orientation.
R919, R920 - two small ones, center right (under the CRT neck) in close proximity of Q905 transistor (with a big heat sink) and two blue disc caps; verticalR521 - near the flyback transformer, slightly above and on the left; horizontalR523 - slightly lower than the previous one; horizontalR423 - left to the J501 (vertical connector, lots of wires); horizontalR506 - far bottom left, above H-hold pot; horizontal
Those are the troublesome ones. Please take a picture of the underside of the board - even if they are slightly different, I should be able to figure out the differences by looking at the connections.
Many thanks.Mateusz
W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True Stickman napisał:
Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US model or an international? Some photos linked below, I can pull the boards out if needed. 

https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0

On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:

Oh, that would be great. If you don't mind, I'd tell you which close-ups I need the most.
BR,Mateusz

W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One True Stickman napisał:
I think I have this monitor, but will have to dig it out of the closet to check. If my memory is correct I'd be happy to grab some photos in the next couple days

On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:

Hello there,
some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor. The whole setup was stored in a moist basement and unfortunately somebody has spilled some washing powder all over it. It turns out that this stuff is even more corrosive than battery acid. The computer itself was in a relative good condition. I had to replace some components, repair two broken traces and give it a good clean and after that it happens to work just fine.
The monitor is a different story. It was very badly corroded, especially resistors were covered with rust. I have desoldered all of them but a few of them were faulty and I couldn't measure their values. Color bars were either washed out or totally covered with rust. I have figured out most of them but I still have some pure guesses. There's no (useful) service manual or schematic I could use.
Before anybody tells me no to bother - I know that this stuff is neither vintage nor rare, but I'm really having fun trying to rescue old hardware. Right now I'm at the point where the PCB is totally emptied of any parts and once I fix the traces and cover them back with solder mask, I will start re-populating the board.
TL;DR - is there anybody out there willing to disassemble his M1296G and take a few photos of the main board?
Thanks a lot.
BR,Mateusz

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Re: Macintosh 12" RGB Display M1296G owners please help [message #364802 is a reply to message #364801] Sun, 04 March 2018 12:16 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
Hi Keith,

>> Have you tested the expected voltages at the various test points on the
circuit boards?

sort of. I'm getting ~100V instead of expected 80V at R920 which is, as per
your measurements, a little bit off. I will replace the 47k resistor with a
proper 27k one and check the voltage again.

>> Also, you may have to test continuity between pads in case of hairline
cracks in the tracks.

Yeah, that will be my step two if the resistor replacement fails.

Apart from that I'd like to hook up my scope to see some waveforms, but I
don't have a separation transformer (yet) so that would be my last
resort... I'm not giving up though.

W dniu niedziela, 4 marca 2018 14:23:43 UTC+1 użytkownik Mat Stalkman
napisał:
>
> Hi Mateusz,
>
> Sorry, been away from the emails for a few days.
>
> I have tested the following resistors out of circuit on my European board.
> Colours are as per my board.
>
> R523 - Brown-Red-Orange - 1-2-000 - Measured 11.7k
> R919 - Brown-Black-Orange - 1-0-000 - Measured 9.7k
> R920 - Red-Violet-Orange - 2-7-000 - Measured 26.9k
>
> Hope this helps,
>
> Keith.
>
> On Saturday, 3 March 2018, 14:55:15 GMT, zgbapl <zg...@o2.pl <javascript:>>
> wrote:
>
>
> Hi Guys,
>
> I managed to rebuild the board and despite my curiosity wants me to power
> this thing on immediately to see if it works, I'd like to check those last
> resistors to be sure that I won't damage the circuitry. Here it goes:
>
> R523 - 12k, my guess was 22k
> R919 - 10k, my guess was 56k
> R920 - 47k, my guess was 27k
>
> Please check them for me, and let's see if it powers up:) In the meantime
> I will clean the rest of wires, connectors etc. and start writing my story
> :) If you confirm those values I will publish my sheet where I have written
> down most of the parts (without inductors, transformers etc) and their
> values. The schematic is on its way.
>
> Cheers,
> Mateusz
>
> W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman
> napisał:
>
> Mateusz,
>
> I have metered the following resistors, out of circuit.
>
> R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
>
> R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
>
> R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>
> R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>
> R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>
> R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>
> R911 - Printed 0.33R - Measured 00.3R (I don't have a lower scale for
> additional decimal places)
>
> Hope this helps ,
>
> Cheers,
>
> Keith
>
> On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:
>
>
> Hi Guys,
>
> the main board is pretty much complete now. I'm only missing a few parts
> now. I'd like to ask you to double check those two resistors:
>
> R423 - my initial guess (I don't remember if I measured it or read the
> stripes) was 6,8K, but you guys say it's 68K
> R506 - the other way round - in my sheet it's 68K, not 6,8K
>
> Additionally I'm not 100% sure if I got those power resistors right:
>
> R419, R526 - 1,2 ohm
> R511, R514 - 10 ohm
> R911 - 0,33 ohm
>
> Hopefully I got it all right. Keep the fingers crossed.
>
> Cheers,
> Mateusz
>
> W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Yes, Keith also measured this one at 160K after I posted my initial list.
> Out-of-circuit test confirms 160K, so there's a triple-check!
>
> On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:
>
>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
> ohm.
>
> I think I have measured this one and it's more like 160K 1%. Maybe you
> could measure it in-circuit? I will do the same with 160K resistor soldered
> in and compare the results. That's the biggest difference between my
> measurements and your readings so far, so it would be nice to double check
> it.
>
> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.
>
> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>
> Added to the folder - in case colors aren't visible, here are resistor
> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
> look like a 1% metal film:
>
> R919 10K (Brown Black Orange)
> R920 47K (Red Violet Orange)
> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
> read)
> R523 12K (Brown Red Orange)
> R423 68K (Blue Grey Black Red 1% metal film)
> R506 6K8 (Blue Grey Red)
>
> Let me know if you need anything else, I didn't have more than a few
> minutes today.
>
> I'd bet the only real difference between the US & European model is in the
> line voltage power supply side of the board and the rest is pretty similar.
> There's a photo of the entire board and one of just the signals/HV side.
> For future searchers: I will upload these all to flickr or imgur as well
> and post the link, as I won't keep them in dropbox forever.
>
>
>
> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>
>>> is yours also a US model or an international?
>
> It's an european one. Seems like there are some differences between our
> models. Still, I'd like to see a few close shots of your board.
>
> So if you could take a pic of the following elements, that would be great.
> To make it easier, I'm gonna tell you rough directions (my board is facing
> the flyback down, so the CRT is on my right hand side) and their
> orientation.
>
> R919, R920 - two small ones, center right (under the CRT neck) in close
> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
> vertical
> R521 - near the flyback transformer, slightly above and on the left;
> horizontal
> R523 - slightly lower than the previous one; horizontal
> R423 - left to the J501 (vertical connector, lots of wires); horizontal
> R506 - far bottom left, above H-hold pot; horizontal
>
> Those are the troublesome ones. Please take a picture of the underside of
> the board - even if they are slightly different, I should be able to figure
> out the differences by looking at the connections.
>
> Many thanks.
> Mateusz
>
> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
> Stickman napisał:
>
> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
> model or an international? Some photos linked below, I can pull the boards
> out if needed.
>
> https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0
> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>
> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>
> Oh, that would be great. If you don't mind, I'd tell you which close-ups I
> need the most.
>
> BR,
> Mateusz
>
> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One
> True Stickman napisał:
>
> I think I have this monitor, but will have to dig it out of the closet to
> check. If my memory is correct I'd be happy to grab some photos in the next
> couple days
>
> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>
> Hello there,
>
> some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor.
> The whole setup was stored in a moist basement and unfortunately somebody
> has spilled some washing powder all over it. It turns out that this stuff
> is even more corrosive than battery acid. The computer itself was in a
> relative good condition. I had to replace some components, repair two
> broken traces and give it a good clean and after that it happens to work
> just fine.
>
> The monitor is a different story. It was very badly corroded, especially
> resistors were covered with rust. I have desoldered all of them but a few
> of them were faulty and I couldn't measure their values. Color bars were
> either washed out or totally covered with rust. I have figured out most of
> them but I still have some pure guesses. There's no (useful) service manual
> or schematic I could use.
>
> Before anybody tells me no to bother - I know that this stuff is neither
> vintage nor rare, but I'm really having fun trying to rescue old hardware.
> Right now I'm at the point where the PCB is totally emptied of any parts
> and once I fix the traces and cover them back with solder mask, I will
> start re-populating the board.
>
> TL;DR - is there anybody out there willing to disassemble his M1296G and
> take a few photos of the main board?
>
> Thanks a lot.
>
> BR,
> Mateusz
>
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364851 is a reply to message #364802] Mon, 05 March 2018 12:26 Go to previous messageGo to next message
zgbapl is currently offline  zgbapl
Messages: 14
Registered: January 2018
Karma: 0
Junior Member
Hi there,

I have replaced R920 to its nominal value and sure enough I'm getting 78V
@80V test point. Close enough. Unfortunately no HV whatsoever. There's
> 100V on HOT's collector so it looks good. I didn't have much time to
troubleshoot it further. Is there any marking on the flyback? You know,
just in case...

Cheers,
Mateusz

W dniu niedziela, 4 marca 2018 18:16:58 UTC+1 użytkownik zgbapl napisał:
>
> Hi Keith,
>
>>> Have you tested the expected voltages at the various test points on the
> circuit boards?
>
> sort of. I'm getting ~100V instead of expected 80V at R920 which is, as
> per your measurements, a little bit off. I will replace the 47k resistor
> with a proper 27k one and check the voltage again.
>
>>> Also, you may have to test continuity between pads in case of hairline
> cracks in the tracks.
>
> Yeah, that will be my step two if the resistor replacement fails.
>
> Apart from that I'd like to hook up my scope to see some waveforms, but I
> don't have a separation transformer (yet) so that would be my last
> resort... I'm not giving up though.
>
> W dniu niedziela, 4 marca 2018 14:23:43 UTC+1 użytkownik Mat Stalkman
> napisał:
>>
>> Hi Mateusz,
>>
>> Sorry, been away from the emails for a few days.
>>
>> I have tested the following resistors out of circuit on my European
>> board. Colours are as per my board.
>>
>> R523 - Brown-Red-Orange - 1-2-000 - Measured 11.7k
>> R919 - Brown-Black-Orange - 1-0-000 - Measured 9.7k
>> R920 - Red-Violet-Orange - 2-7-000 - Measured 26.9k
>>
>> Hope this helps,
>>
>> Keith.
>>
>> On Saturday, 3 March 2018, 14:55:15 GMT, zgbapl <zg...@o2.pl> wrote:
>>
>>
>> Hi Guys,
>>
>> I managed to rebuild the board and despite my curiosity wants me to power
>> this thing on immediately to see if it works, I'd like to check those last
>> resistors to be sure that I won't damage the circuitry. Here it goes:
>>
>> R523 - 12k, my guess was 22k
>> R919 - 10k, my guess was 56k
>> R920 - 47k, my guess was 27k
>>
>> Please check them for me, and let's see if it powers up:) In the meantime
>> I will clean the rest of wires, connectors etc. and start writing my story
>> :) If you confirm those values I will publish my sheet where I have written
>> down most of the parts (without inductors, transformers etc) and their
>> values. The schematic is on its way.
>>
>> Cheers,
>> Mateusz
>>
>> W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman
>> napisał:
>>
>> Mateusz,
>>
>> I have metered the following resistors, out of circuit.
>>
>> R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
>>
>> R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
>>
>> R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>>
>> R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>>
>> R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
>>
>> R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
>>
>> R911 - Printed 0.33R - Measured 00.3R (I don't have a lower scale for
>> additional decimal places)
>>
>> Hope this helps ,
>>
>> Cheers,
>>
>> Keith
>>
>> On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:
>>
>>
>> Hi Guys,
>>
>> the main board is pretty much complete now. I'm only missing a few parts
>> now. I'd like to ask you to double check those two resistors:
>>
>> R423 - my initial guess (I don't remember if I measured it or read the
>> stripes) was 6,8K, but you guys say it's 68K
>> R506 - the other way round - in my sheet it's 68K, not 6,8K
>>
>> Additionally I'm not 100% sure if I got those power resistors right:
>>
>> R419, R526 - 1,2 ohm
>> R511, R514 - 10 ohm
>> R911 - 0,33 ohm
>>
>> Hopefully I got it all right. Keep the fingers crossed.
>>
>> Cheers,
>> Mateusz
>>
>> W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Yes, Keith also measured this one at 160K after I posted my initial list.
>> Out-of-circuit test confirms 160K, so there's a triple-check!
>>
>> On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:
>>
>>>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> I think I have measured this one and it's more like 160K 1%. Maybe you
>> could measure it in-circuit? I will do the same with 160K resistor soldered
>> in and compare the results. That's the biggest difference between my
>> measurements and your readings so far, so it would be nice to double check
>> it.
>>
>> W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16
>> ohm.
>>
>> On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:
>>
>> Added to the folder - in case colors aren't visible, here are resistor
>> codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which
>> look like a 1% metal film:
>>
>> R919 10K (Brown Black Orange)
>> R920 47K (Red Violet Orange)
>> R521 86ohm? (Violet Blue Black Gold 1% metal film - this one is hard to
>> read)
>> R523 12K (Brown Red Orange)
>> R423 68K (Blue Grey Black Red 1% metal film)
>> R506 6K8 (Blue Grey Red)
>>
>> Let me know if you need anything else, I didn't have more than a few
>> minutes today.
>>
>> I'd bet the only real difference between the US & European model is in
>> the line voltage power supply side of the board and the rest is pretty
>> similar. There's a photo of the entire board and one of just the signals/HV
>> side.
>> For future searchers: I will upload these all to flickr or imgur as well
>> and post the link, as I won't keep them in dropbox forever.
>>
>>
>>
>> On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:
>>
>>>> is yours also a US model or an international?
>>
>> It's an european one. Seems like there are some differences between our
>> models. Still, I'd like to see a few close shots of your board.
>>
>> So if you could take a pic of the following elements, that would be
>> great. To make it easier, I'm gonna tell you rough directions (my board is
>> facing the flyback down, so the CRT is on my right hand side) and their
>> orientation.
>>
>> R919, R920 - two small ones, center right (under the CRT neck) in close
>> proximity of Q905 transistor (with a big heat sink) and two blue disc caps;
>> vertical
>> R521 - near the flyback transformer, slightly above and on the left;
>> horizontal
>> R523 - slightly lower than the previous one; horizontal
>> R423 - left to the J501 (vertical connector, lots of wires); horizontal
>> R506 - far bottom left, above H-hold pot; horizontal
>>
>> Those are the troublesome ones. Please take a picture of the underside of
>> the board - even if they are slightly different, I should be able to figure
>> out the differences by looking at the connections.
>>
>> Many thanks.
>> Mateusz
>>
>> W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True
>> Stickman napisał:
>>
>> Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US
>> model or an international? Some photos linked below, I can pull the boards
>> out if needed.
>>
>> https://www.dropbox.com/sh/ 9s390k8gcva62e4/
>> AABptFdkwVknxSDRcH_zyi40a?dl=0
>> < https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2 Fsh%2F9s390k8gcva62e4%2FAABptFdkwVknxSDRcH_zyi40a%3Fdl%3D0&a mp;sa=D&sntz=1&usg=AFQjCNFUXsgjhDrU1UsJR0EwscrU8WJr9 A>
>>
>> On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:
>>
>> Oh, that would be great. If you don't mind, I'd tell you which close-ups
>> I need the most.
>>
>> BR,
>> Mateusz
>>
>> W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One
>> True Stickman napisał:
>>
>> I think I have this monitor, but will have to dig it out of the closet to
>> check. If my memory is correct I'd be happy to grab some photos in the next
>> couple days
>>
>> On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:
>>
>> Hello there,
>>
>> some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor.
>> The whole setup was stored in a moist basement and unfortunately somebody
>> has spilled some washing powder all over it. It turns out that this stuff
>> is even more corrosive than battery acid. The computer itself was in a
>> relative good condition. I had to replace some components, repair two
>> broken traces and give it a good clean and after that it happens to work
>> just fine.
>>
>> The monitor is a different story. It was very badly corroded, especially
>> resistors were covered with rust. I have desoldered all of them but a few
>> of them were faulty and I couldn't measure their values. Color bars were
>> either washed out or totally covered with rust. I have figured out most of
>> them but I still have some pure guesses. There's no (useful) service manual
>> or schematic I could use.
>>
>> Before anybody tells me no to bother - I know that this stuff is neither
>> vintage nor rare, but I'm really having fun trying to rescue old hardware.
>> Right now I'm at the point where the PCB is totally emptied of any parts
>> and once I fix the traces and cover them back with solder mask, I will
>> start re-populating the board.
>>
>> TL;DR - is there anybody out there willing to disassemble his M1296G and
>> take a few photos of the main board?
>>
>> Thanks a lot.
>>
>> BR,
>> Mateusz
>>
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Re: Macintosh 12" RGB Display M1296G owners please help [message #364865 is a reply to message #364851] Mon, 05 March 2018 14:46 Go to previous message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
Senior Member
Hi Mateusz,
I see a single label on the FB.
Three lines of text
CP334P03001(the reverse UR symbol) MSU1FSB01CM 91518T and a small five pointed star
I found three references to CP334P03001 - a flyback transformer.
APPLE HR 46097MACINTOSH HR 46097MITSUBISHI HR 46097

For MSU1FSB01
2015 LZ174D055T 123.456.7910 *  2052 MSU1FSB01 12.34.79.562015 LZ174D055T 123.456.7910 *  2052 MSU1FSB01 12.34.79.56

on this page televisio_新浪博客 quite close to the bottom. The LZ174D055T reference may be a part number.

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televisio_新浪博客

televisio_新浪博客,televisio
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So there may be a compatible part out there.
Cheers,
Keith


On Monday, 5 March 2018, 17:26:11 GMT, zgbapl <zgba@o2.pl> wrote:

Hi there,
I have replaced R920 to its nominal value and sure enough I'm getting 78V @80V test point. Close enough. Unfortunately no HV whatsoever. There's >100V on HOT's collector so it looks good. I didn't have much time to troubleshoot it further. Is there any marking on the flyback? You know, just in case...
Cheers,Mateusz

W dniu niedziela, 4 marca 2018 18:16:58 UTC+1 użytkownik zgbapl napisał:
Hi Keith,
>> Have you tested the expected voltages at the various test points on the circuit boards? 
sort of. I'm getting ~100V instead of expected 80V at R920 which is, as per your measurements, a little bit off. I will replace the 47k resistor with a proper 27k one and check the voltage again.
>> Also, you may have to test continuity between pads in case of hairline cracks in the tracks.
Yeah, that will be my step two if the resistor replacement fails.
Apart from that I'd like to hook up my scope to see some waveforms, but I don't have a separation transformer (yet) so that would be my last resort... I'm not giving up though.
W dniu niedziela, 4 marca 2018 14:23:43 UTC+1 użytkownik Mat Stalkman napisał:
Hi Mateusz,
Sorry, been away from the emails for a few days.
I have tested the following resistors out of circuit on my European board. Colours are as per my board.
R523 - Brown-Red-Orange - 1-2-000 - Measured 11.7k R919 - Brown-Black-Orange - 1-0-000 - Measured 9.7kR920 - Red-Violet-Orange - 2-7-000 - Measured 26.9k
Hope this helps,
Keith.
On Saturday, 3 March 2018, 14:55:15 GMT, zgbapl <zg...@o2.pl> wrote:

Hi Guys,
I managed to rebuild the board and despite my curiosity wants me to power this thing on immediately to see if it works, I'd like to check those last resistors to be sure that I won't damage the circuitry. Here it goes:
R523 - 12k, my guess was 22kR919 - 10k, my guess was 56kR920 - 47k, my guess was 27k
Please check them for me, and let's see if it powers up:) In the meantime I will clean the rest of wires, connectors etc. and start writing my story :) If you confirm those values I will publish my sheet where I have written down most of the parts (without inductors, transformers etc) and their values. The schematic is on its way.
Cheers,Mateusz

W dniu sobota, 24 lutego 2018 14:50:49 UTC+1 użytkownik Mat Stalkman napisał:
Mateusz,
I have metered the following resistors, out of circuit.
R423 - Blue-Grey-Black-Red - 6-8-0-x10^2 - 68k - Measured 67.6k
R506 - Blue-Grey-Red - 6-8-x10^2 - 6.8k - Measured 6.85k
R419 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R511 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R514 - Brown-Black-Black - 1-0-x10^0 - 10R - Measured 9.9R
R526 - Brown-Red-Gold - 1-2-x10^-1 - 1.2R - Measured 1.3R
R911 - Printed 0.33R -  Measured 00.3R (I don't have a lower scale for additional decimal places)
Hope this helps ,
Cheers,
Keith
On Thursday, 22 February 2018, 19:10:23 GMT, zgbapl <zg...@o2.pl> wrote:

Hi Guys,
the main board is pretty much complete now. I'm only missing a few parts now. I'd like to ask you to double check those two resistors:
R423 - my initial guess (I don't remember if I measured it or read the stripes) was 6,8K, but you guys say it's 68KR506 - the other way round - in my sheet it's 68K, not 6,8K
Additionally I'm not 100% sure if I got those power resistors right:
R419, R526 - 1,2 ohmR511, R514 - 10 ohmR911 - 0,33 ohm
Hopefully I got it all right. Keep the fingers crossed.
Cheers,Mateusz
W dniu wtorek, 20 lutego 2018 21:59:16 UTC+1 użytkownik The One True Stickman napisał:
Yes, Keith also measured this one at 160K after I posted my initial list. Out-of-circuit test confirms 160K, so there's a triple-check!

On Tue, Feb 20, 2018 at 6:05 AM, zgbapl <zg...@o2.pl> wrote:

>> Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm. 
I think I have measured this one and it's more like 160K 1%. Maybe you could measure it in-circuit? I will do the same with 160K resistor soldered in and compare the results. That's the biggest difference between my measurements and your readings so far, so it would be nice to double check it.

W dniu piątek, 2 lutego 2018 14:14:54 UTC+1 użytkownik The One True Stickman napisał:
Typo - 86 makes no sense for R521, I think it must either be 76 or 16 ohm.

On Tue, Jan 30, 2018 at 7:58 PM, <theonetru...@gmail.com> wrote:

Added to the folder - in case colors aren't visible, here are resistor codes & values. All appear to be 1/8W carbon 5% except R521 & R423, which look like a 1% metal film:

R919 10K (Brown Black Orange)
R920 47K (Red Violet Orange)
R521 86ohm?  (Violet Blue Black Gold 1% metal film - this one is hard to read)
R523 12K (Brown Red Orange)
R423 68K (Blue Grey Black Red 1% metal film)
R506 6K8 (Blue Grey Red)

Let me know if you need anything else, I didn't have more than a few minutes today.

I'd bet the only real difference between the US & European model is in the line voltage power supply side of the board and the rest is pretty similar. There's a photo of the entire board and one of just the signals/HV side.
For future searchers: I will upload these all to flickr or imgur as well and post the link, as I won't keep them in dropbox forever. 



On Tue, Jan 30, 2018 at 1:57 AM, zgbapl <zg...@o2.pl> wrote:

>>   is yours also a US model or an international?

It's an european one. Seems like there are some differences between our models. Still, I'd like to see a few close shots of your board.
So if you could take a pic of the following elements, that would be great. To make it easier, I'm gonna tell you rough directions (my board is facing the flyback down, so the CRT is on my right hand side) and their orientation.
R919, R920 - two small ones, center right (under the CRT neck) in close proximity of Q905 transistor (with a big heat sink) and two blue disc caps; verticalR521 - near the flyback transformer, slightly above and on the left; horizontalR523 - slightly lower than the previous one; horizontalR423 - left to the J501 (vertical connector, lots of wires); horizontalR506 - far bottom left, above H-hold pot; horizontal
Those are the troublesome ones. Please take a picture of the underside of the board - even if they are slightly different, I should be able to figure out the differences by looking at the connections.
Many thanks.Mateusz
W dniu wtorek, 30 stycznia 2018 00:19:06 UTC+1 użytkownik The One True Stickman napisał:
Mine is an M1296 110V/60Hz US model, no G suffix - is yours also a US model or an international? Some photos linked below, I can pull the boards out if needed. 

https://www.dropbox.com/sh/ 9s390k8gcva62e4/ AABptFdkwVknxSDRcH_zyi40a?dl=0

On Mon, Jan 29, 2018 at 8:49 AM, zgbapl <zg...@o2.pl> wrote:

Oh, that would be great. If you don't mind, I'd tell you which close-ups I need the most.
BR,Mateusz

W dniu poniedziałek, 29 stycznia 2018 14:12:23 UTC+1 użytkownik The One True Stickman napisał:
I think I have this monitor, but will have to dig it out of the closet to check. If my memory is correct I'd be happy to grab some photos in the next couple days

On Mon, Jan 29, 2018 at 5:22 AM, zgbapl <zg...@o2.pl> wrote:

Hello there,
some time ago I got my first Mac ever - an LCII with a 12" RGB Monitor. The whole setup was stored in a moist basement and unfortunately somebody has spilled some washing powder all over it. It turns out that this stuff is even more corrosive than battery acid. The computer itself was in a relative good condition. I had to replace some components, repair two broken traces and give it a good clean and after that it happens to work just fine.
The monitor is a different story. It was very badly corroded, especially resistors were covered with rust. I have desoldered all of them but a few of them were faulty and I couldn't measure their values. Color bars were either washed out or totally covered with rust. I have figured out most of them but I still have some pure guesses. There's no (useful) service manual or schematic I could use.
Before anybody tells me no to bother - I know that this stuff is neither vintage nor rare, but I'm really having fun trying to rescue old hardware. Right now I'm at the point where the PCB is totally emptied of any parts and once I fix the traces and cover them back with solder mask, I will start re-populating the board.
TL;DR - is there anybody out there willing to disassemble his M1296G and take a few photos of the main board?
Thanks a lot.
BR,Mateusz

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