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| Re: Macinato Classic analog board blows fuse [message #359565 is a reply to message #359553] |
Sun, 24 December 2017 03:51   |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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Replace caps on ab.... leaakers... espica lly on smps output side...
On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
> This Classic was showing the usual video artifacts due to bad capacitors.
>
> So I replaced the group of capacitors which are known to cause the video
> problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or
> 2 and suddenly started blowing fuses.
>
> I replaced the mosfet but still no luck.
>
> Any idea why it started blowing the fuse two days after the replacement,
> but not immediately after it?
>
> bcg
>
>
> bcg
>
> --
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| Re: Macintosh Classic analog board blows fuse [message #359566 is a reply to message #359565] |
Sun, 24 December 2017 03:54 |
Beniamino Cenci Goga
Messages: 17
Registered: August 2012
Karma: 0
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Junior Member |
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Thank you! Yes I have replaced all leaking caps and it has worked flawlessly for a day or 2. Then suddenly it blown the fuse.
bcg
> On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>
> Replace caps on ab.... leaakers... espica lly on smps output side...
>
>> On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>> This Classic was showing the usual video artifacts due to bad capacitors.
>>
>> So I replaced the group of capacitors which are known to cause the video problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or 2 and suddenly started blowing fuses.
>>
>> I replaced the mosfet but still no luck.
>>
>> Any idea why it started blowing the fuse two days after the replacement, but not immediately after it?
>>
>> bcg
>>
>>
>> bcg
>>
>> --
>> --
>> -----
>> 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
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| Re: Macintosh Classic analog board blows fuse [message #359567 is a reply to message #359566] |
Sun, 24 December 2017 04:25 |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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Opto isolater can go bad for classic ab's
On Dec 24, 2017 3:54 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
> Thank you! Yes I have replaced all leaking caps and it has worked
> flawlessly for a day or 2. Then suddenly it blown the fuse.
>
> bcg
>
> On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>
> Replace caps on ab.... leaakers... espica lly on smps output side...
>
> On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>
>> This Classic was showing the usual video artifacts due to bad capacitors.
>>
>> So I replaced the group of capacitors which are known to cause the video
>> problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or
>> 2 and suddenly started blowing fuses.
>>
>> I replaced the mosfet but still no luck.
>>
>> Any idea why it started blowing the fuse two days after the replacement,
>> but not immediately after it?
>>
>> bcg
>>
>>
>> bcg
>>
>> --
>> --
>> -----
>> 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
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| Re: Macintosh Classic analog board blows fuse [message #359568 is a reply to message #359567] |
Sun, 24 December 2017 05:22 |
Beniamino Cenci Goga
Messages: 17
Registered: August 2012
Karma: 0
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Junior Member |
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Yes, I have replaced:
-) the group of leaking caps
-) IC TDA 4605
-) opto isolator
-) mosfet (it goes bad any time the fuse blows)
when he fuse blows, I think that also something else, besides the mosfet, goes bad.
bcg
> On Dec 24, 2017, at 10:25 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>
> Opto isolater can go bad for classic ab's
>
>> On Dec 24, 2017 3:54 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>> Thank you! Yes I have replaced all leaking caps and it has worked flawlessly for a day or 2. Then suddenly it blown the fuse.
>>
>> bcg
>>
>>> On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>>>
>>> Replace caps on ab.... leaakers... espica lly on smps output side...
>>>
>>>> On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>>>> This Classic was showing the usual video artifacts due to bad capacitors.
>>>>
>>>> So I replaced the group of capacitors which are known to cause the video problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or 2 and suddenly started blowing fuses.
>>>>
>>>> I replaced the mosfet but still no luck.
>>>>
>>>> Any idea why it started blowing the fuse two days after the replacement, but not immediately after it?
>>>>
>>>> bcg
>>>>
>>>>
>>>> bcg
>>>>
>>>> --
>>>> --
>>>> -----
>>>> 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
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>>>>
>>>> Support for older Macs: http://lowendmac.com/services/
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>>>
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| Re: Macintosh Classic analog board blows fuse [message #359581 is a reply to message #359568] |
Sun, 24 December 2017 10:00 |
Notgoing Totellyou
Messages: 284
Registered: December 2012
Karma: 0
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Senior Member |
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Bridge the fuse, and see what catches fire. And that is your issue. :)
On Dec 24, 2017 5:22 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
> Yes, I have replaced:
>
> -) the group of leaking caps
>
> -) IC TDA 4605
>
> -) opto isolator
>
> -) mosfet (it goes bad any time the fuse blows)
>
> when he fuse blows, I think that also something else, besides the mosfet,
> goes bad.
>
>
> bcg
>
> On Dec 24, 2017, at 10:25 AM, Hardware Mack <hardwaremack@gmail.com>
> wrote:
>
> Opto isolater can go bad for classic ab's
>
> On Dec 24, 2017 3:54 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>
>> Thank you! Yes I have replaced all leaking caps and it has worked
>> flawlessly for a day or 2. Then suddenly it blown the fuse.
>>
>> bcg
>>
>> On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com>
>> wrote:
>>
>> Replace caps on ab.... leaakers... espica lly on smps output side...
>>
>> On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>>
>>> This Classic was showing the usual video artifacts due to bad capacitors.
>>>
>>> So I replaced the group of capacitors which are known to cause the video
>>> problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or
>>> 2 and suddenly started blowing fuses.
>>>
>>> I replaced the mosfet but still no luck.
>>>
>>> Any idea why it started blowing the fuse two days after the replacement,
>>> but not immediately after it?
>>>
>>> bcg
>>>
>>>
>>> bcg
>>>
>>> --
>>> --
>>> -----
>>> 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
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>>>
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| Re: Macintosh Classic analog board blows fuse [message #359593 is a reply to message #359581] |
Sun, 24 December 2017 12:08 |
Beniamino Cenci Goga
Messages: 17
Registered: August 2012
Karma: 0
|
Junior Member |
|
|
I toasted one board when I powered on without the IC TDA4605: nice blow
bcg from iPhone & Lifeproof Frē
> On 24 Dec 2017, at 16:00, Hardware Mack <hardwaremack@gmail.com> wrote:
>
> Bridge the fuse, and see what catches fire. And that is your issue. :)
>
>> On Dec 24, 2017 5:22 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>> Yes, I have replaced:
>>
>> -) the group of leaking caps
>>
>> -) IC TDA 4605
>>
>> -) opto isolator
>>
>> -) mosfet (it goes bad any time the fuse blows)
>>
>> when he fuse blows, I think that also something else, besides the mosfet, goes bad.
>>
>>
>> bcg
>>
>>> On Dec 24, 2017, at 10:25 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>>>
>>> Opto isolater can go bad for classic ab's
>>>
>>>> On Dec 24, 2017 3:54 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>>>> Thank you! Yes I have replaced all leaking caps and it has worked flawlessly for a day or 2. Then suddenly it blown the fuse.
>>>>
>>>> bcg
>>>>
>>>> > On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
>>>> >
>>>> > Replace caps on ab.... leaakers... espica lly on smps output side...
>>>> >
>>>> >> On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
>>>> >> This Classic was showing the usual video artifacts due to bad capacitors.
>>>> >>
>>>> >> So I replaced the group of capacitors which are known to cause the video problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or 2 and suddenly started blowing fuses.
>>>> >>
>>>> >> I replaced the mosfet but still no luck.
>>>> >>
>>>> >> Any idea why it started blowing the fuse two days after the replacement, but not immediately after it?
>>>> >>
>>>> >> bcg
>>>> >>
>>>> >>
>>>> >> bcg
>>>> >>
>>>> >> --
>>>> >> --
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| Re: Macintosh Classic analog board blows fuse [message #360286 is a reply to message #359593] |
Mon, 08 January 2018 19:59 |
vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
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Senior Member |
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Just wanted to add my two cents.
When I replace the caps on a comact Mac, I replace all of the electrolytic caps, regardless of whether they are leaking or not.
I also ensure that the AB or DB is thoroughly cleaned with IPA to remove any electrolytic deposits as any electrolyte bridging contacts, will short.
I have used the dishwasher method, with detergent and two rinses to clean boards of all kinds of debris, especially tobacco staining, grimy deposits and electrolyte residue. I have used this successfully on ABs and DBs - I remove the socketed ICs before I wash the DBs. Then the boards are flushed with DI water and IPA before being left in a warm place for 24 hours. Just because it works for me, doesn't mean it will always work for someone else.
One thing to note is that electrolytic capacitors are polarity sensitive and, if they are inserted incorrectly, can explode or cause shorts which would lead to fuses blowing.
Sometimes you have to do nothing else but take a magnifying glass to the board and examine it very carefully to discover a bridged track, or an electrode bridging to something it shouldn't or any number of other electrical issues.
Good luck with getting the AB to work without blowing the fuse.
Keith
On Sunday, 24 December 2017, 17:08:32 GMT, Beniamino Cenci Goga <benann@gmail.com> wrote:
I toasted one board when I powered on without the IC TDA4605: nice blow
bcg from iPhone & Lifeproof Frē
On 24 Dec 2017, at 16:00, Hardware Mack <hardwaremack@gmail.com> wrote:
Bridge the fuse, and see what catches fire. And that is your issue. :)
On Dec 24, 2017 5:22 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
Yes, I have replaced:
-) the group of leaking caps
-) IC TDA 4605
-) opto isolator
-) mosfet (it goes bad any time the fuse blows)
when he fuse blows, I think that also something else, besides the mosfet, goes bad.
bcg
On Dec 24, 2017, at 10:25 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
Opto isolater can go bad for classic ab's
On Dec 24, 2017 3:54 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
Thank you! Yes I have replaced all leaking caps and it has worked flawlessly for a day or 2. Then suddenly it blown the fuse.
bcg
On Dec 24, 2017, at 9:51 AM, Hardware Mack <hardwaremack@gmail.com> wrote:
Replace caps on ab.... leaakers... espica lly on smps output side...
On Dec 24, 2017 3:43 AM, "Beniamino Cenci Goga" <benann@gmail.com> wrote:
This Classic was showing the usual video artifacts due to bad capacitors.
So I replaced the group of capacitors which are known to cause the video problem and an IC, the TDA4605. The Mac has worked flawlessly for a day or 2 and suddenly started blowing fuses.
I replaced the mosfet but still no luck.
Any idea why it started blowing the fuse two days after the replacement, but not immediately after it?
bcg
bcg
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