| C64 hardware problem [message #105038] |
Fri, 04 March 2005 06:30  |
Sune Salminen
Messages: 8
Registered: March 2005
Karma: 0
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Junior Member |
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Hi.
Both my C64s have stopped working.
I've been using a Chroma/Luma/Audio cable with them, but I twisted the
ends together because my TV only has composite input. This worked
perfectly for a while, but now both my C64's just come on with no video
(black screen) with the power light still on. And I can't load anything
from disk 'blind', they appear to be locked up.
I had been using my C64-C for a couple of hours showing some demos to a
friend, and then after switching it off and then back on at one time
suddenly, the screen was just black.
The same thing appears to be wrong with my older, 'breadbin' model. The
RF output on both machines is dead too.
Is this something i can fix myself? I have +8 in soldering skill. :-)
I hope its just a matter of replacing an IC.
-Sune
--
Nuke a gay vegan whale for christ!
My band: www.secondnature.dk
[Remove the monkey to send mail]
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| Re: C64 hardware problem [message #105039 is a reply to message #105038] |
Fri, 04 March 2005 07:23  |
Lars Haugseth
Messages: 231
Registered: April 2012
Karma: 0
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Senior Member |
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* "Sune Salminen" <salminen@monkeydoktor.dk> wrote:
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| Hi.
|
| Both my C64s have stopped working.
|
| I've been using a Chroma/Luma/Audio cable with them, but I twisted the
| ends together because my TV only has composite input. This worked
| perfectly for a while, but now both my C64's just come on with no video
| (black screen) with the power light still on. And I can't load anything
| from disk 'blind', they appear to be locked up.
| I had been using my C64-C for a couple of hours showing some demos to a
| friend, and then after switching it off and then back on at one time
| suddenly, the screen was just black.
|
| The same thing appears to be wrong with my older, 'breadbin' model. The
| RF output on both machines is dead too.
|
| Is this something i can fix myself? I have +8 in soldering skill. :-)
|
| I hope its just a matter of replacing an IC.
This have happened to me a couple of times, and it's usually due to
a blown SID (6581/8580) chip. The first thing you should do is try to
remove the SID chip and see whether the C64 will boot after that. If
it boots, it's definitely your SID chip that needs to be replaced.
(The C64 will work "perfectly" well without it, but you won't get any
sound, paddle-controlled games won't work and programs using the SID
to generate random number sequences won't work as expected either.)
--
Lars Haugseth
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| Re: C64 hardware problem [message #105045 is a reply to message #105039] |
Fri, 04 March 2005 09:59 |
Cameron Kaiser
Messages: 1622
Registered: December 2011
Karma: 0
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Senior Member |
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Lars Haugseth <njus@larshaugseth.com> writes:
>> I had been using my C64-C for a couple of hours showing some demos to a
>> friend, and then after switching it off and then back on at one time
>> suddenly, the screen was just black.
> This have happened to me a couple of times, and it's usually due to
> a blown SID (6581/8580) chip. The first thing you should do is try to
> remove the SID chip and see whether the C64 will boot after that. If
> it boots, it's definitely your SID chip that needs to be replaced.
I suspect the PLA, too. Unfortunately, that will need to be replaced.
--
Cameron Kaiser * ckaiser@floodgap.com * posting with a Commodore 128
personal page: http://www.armory.com/%7Espectre/
** Computer Workshops: games, productivity software and more for C64/128! **
** http://www.armory.com/%7Espectre/cwi/ **
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| Re: C64 hardware problem [message #105211 is a reply to message #105038] |
Sat, 05 March 2005 02:17 |
dowcom
Messages: 773
Registered: July 2003
Karma: 0
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Senior Member |
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'Lo Sune:
Group: comp.sys.cbm Date: Fri, Mar 4, 2005, 12:30pm (CST+7) From:
salminen@monkeydoktor.dk (Sune Salminen)
script:
> I've been using a Chroma/Luma/Audio
> cable with them, but I twisted the ends
> together because my TV only has
> composite input.
IIRC: The C64 has true composite (too) on the chroma leg, so the
twisting shouldn't be necessary.
Don't know if this could have contributed to your problems.
> Nuke a gay vegan whale for christ!
Har!
salaam,
dowcom
To e-mail me, add the character zero to "dowcom". i.e.:
dowcom(zero)(at)webtv(dot)net.
--
http://community.webtv.net/dowcom/DOWCOMSAMSTRADGUIDE
MSWindows is television,
Linux is radar.
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| Re: C64 hardware problem [message #105214 is a reply to message #105211] |
Sat, 05 March 2005 05:34 |
Sune Salminen
Messages: 8
Registered: March 2005
Karma: 0
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Junior Member |
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bud wrote:
> 'Lo Sune:
>
> Group: comp.sys.cbm Date: Fri, Mar 4, 2005, 12:30pm (CST+7) From:
> salminen@monkeydoktor.dk (Sune Salminen)
>
> script:
>
>> I've been using a Chroma/Luma/Audio
>> cable with them, but I twisted the ends
>> together because my TV only has
>> composite input.
>
> IIRC: The C64 has true composite (too) on the chroma leg, so the
> twisting shouldn't be necessary.
Well could only get a B/W picture if I didn't twist the ends together.
Maybe there's something wrong with my cable.
> Don't know if this could have contributed to your problems.
I hope not!
Thanks
-Sune
--
Nuke a gay vegan whale for christ!
My band: www.secondnature.dk
[Remove the monkey to send mail]
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| Re: C64 hardware problem [message #105215 is a reply to message #105045] |
Sat, 05 March 2005 05:38 |
Sune Salminen
Messages: 8
Registered: March 2005
Karma: 0
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Junior Member |
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Cameron Kaiser wrote:
> Lars Haugseth <njus@larshaugseth.com> writes:
>
>>> I had been using my C64-C for a couple of hours showing some demos
>>> to a friend, and then after switching it off and then back on at
>>> one time suddenly, the screen was just black.
>
>> This have happened to me a couple of times, and it's usually due to
>> a blown SID (6581/8580) chip. The first thing you should do is try to
>> remove the SID chip and see whether the C64 will boot after that. If
>> it boots, it's definitely your SID chip that needs to be replaced.
>
> I suspect the PLA, too. Unfortunately, that will need to be replaced.
Thanks to you both.
I pulled out the SIDs in both machines and nothing changed.
What's the PLA and is it difficult to replace..? I hope its not a custom
chip.
It sounds like a political organisation.
-Sune
--
Nuke a gay vegan whale for christ!
My band: www.secondnature.dk
[Remove the monkey to send mail]
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| Re: C64 hardware problem [message #105312 is a reply to message #105038] |
Sun, 06 March 2005 00:58 |
Sam Gillett
Messages: 2422
Registered: June 2003
Karma: 0
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Senior Member |
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"Sune Salminen" ...
> I had been using my C64-C for a couple of hours showing some demos to a
> friend, and then after switching it off and then back on at one time
> suddenly, the screen was just black.
>
> The same thing appears to be wrong with my older, 'breadbin' model. The
> RF output on both machines is dead too.
Are you using the same power supply with both C64's? If so, your power
supply could be bad.
--
Best regards,
Sam Gillett
Change is inevitable,
except from vending machines!
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| Re: C64 hardware problem [message #105402 is a reply to message #105312] |
Mon, 07 March 2005 06:38 |
Sune Salminen
Messages: 8
Registered: March 2005
Karma: 0
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Junior Member |
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Sam Gillett wrote:
> "Sune Salminen" ...
>
>> I had been using my C64-C for a couple of hours showing some demos
>> to a friend, and then after switching it off and then back on at one
>> time suddenly, the screen was just black.
>>
>> The same thing appears to be wrong with my older, 'breadbin' model.
>> The RF output on both machines is dead too.
>
> Are you using the same power supply with both C64's? If so, your
> power supply could be bad.
No, I have the original PSUs for both machines. I guess they could both
be bad.
The fuses on the old PSU are intact. The new one doesn't have any, at
least not ones that are accessible from the outside.
Is it possible to open them up without destroying the case?
-Sune
--
Nuke a gay vegan whale for christ!
My band: www.secondnature.dk
[Remove the monkey to send mail]
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| Re: C64 hardware problem [message #105436 is a reply to message #105402] |
Mon, 07 March 2005 21:43 |
Sam Gillett
Messages: 2422
Registered: June 2003
Karma: 0
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Senior Member |
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"Sune Salminen" wrote ...
> Sam Gillett wrote:
>> "Sune Salminen" ...
>>
>>> I had been using my C64-C for a couple of hours showing some demos
>>> to a friend, and then after switching it off and then back on at one
>>> time suddenly, the screen was just black.
>>>
>>> The same thing appears to be wrong with my older, 'breadbin' model.
>>> The RF output on both machines is dead too.
>>
>> Are you using the same power supply with both C64's? If so, your
>> power supply could be bad.
>
> No, I have the original PSUs for both machines. I guess they could both
> be bad.
>
> The fuses on the old PSU are intact. The new one doesn't have any, at
> least not ones that are accessible from the outside.
It is unlikely that both power supplies would fail at the same time. It is
also unlikely that both C64's would fail at the same time. The best
troubleshooting and repair info for the C64 that I know of is on Ray
Carlsen's website.
http://personalpages.tds.net/~rcarlsen/
Hope you will find the answer to your C64 problems there.
--
Best regards,
Sam Gillett
Change is inevitable,
except from vending machines!
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| Re: C64 hardware problem [message #105521 is a reply to message #105436] |
Tue, 08 March 2005 12:17 |
Sune Salminen
Messages: 8
Registered: March 2005
Karma: 0
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Junior Member |
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Sam Gillett wrote:
> It is unlikely that both power supplies would fail at the same time.
> It is also unlikely that both C64's would fail at the same time.
Nevertheless that's what has happened.
I've been using both machines with an XE-1541 cable and Nicolas Coplins
64HDD running on an old laptop. Could this have caused any damage to the
C64's..?
The
> best troubleshooting and repair info for the C64 that I know of is on
> Ray Carlsen's website.
>
> http://personalpages.tds.net/~rcarlsen/
>
> Hope you will find the answer to your C64 problems there.
Thank you. Me too.
-Sune
--
Nuke a gay vegan whale for christ!
My band: www.secondnature.dk
[Remove the monkey to send mail]
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| Re: C64 hardware problem [message #105674 is a reply to message #105211] |
Sat, 12 March 2005 07:02 |
Stefan Pohlmann
Messages: 23
Registered: March 2005
Karma: 0
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Junior Member |
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bud wrote:
> Sune Salminen wrote:
>
>> I've been using a Chroma/Luma/Audio
>> cable with them, but I twisted the ends
>> together because my TV only has
>> composite input.
>
> IIRC: The C64 has true composite (too) on the chroma leg, so the
> twisting shouldn't be necessary.
Yes, the C64 has true composite too, but not on the chroma leg. It has
an extra leg for that. Have a look here:
http://sta.c64.org/cbmmonc.html
--
My e-mail-address is valid and doesn't need to be adapted.
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| Re: C64 hardware problem [message #105675 is a reply to message #105038] |
Sat, 12 March 2005 07:13 |
Martijn van Buul
Messages: 326
Registered: December 2011
Karma: 0
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Senior Member |
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It occurred to me that Sune Salminen wrote in comp.sys.cbm:
> Hi.
>
> Both my C64s have stopped working.
>
> I've been using a Chroma/Luma/Audio cable with them, but I twisted the
> ends together because my TV only has composite input.
Although I doubt your current problems are related to this, one word of
advice:
Combining Chroma and Luma by merely twisting them together is *not* a very
safe thing to do. It is much safer to use a 470 pF capacitor to tie the
chrominance to the luminance. This way, you're not going to short anything.
( so do something like:
Luma -----------------+
+------------- "composite"
Chroma ----||---------+
470 pF
)
But, like others pointed out, there's a composite video output readily
available.
--
Martijn van Buul - pino@dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov
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| Re: C64 hardware problem [message #105707 is a reply to message #105674] |
Sun, 13 March 2005 03:22 |
dowcom
Messages: 773
Registered: July 2003
Karma: 0
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Senior Member |
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'Lo Stefan:
Group: comp.sys.cbm Date: Sat, Mar 12, 2005, 1:02pm (CST+7) From:
pohli.nospam.usenet@gmx.de (Stefan Pohlmann)
script:
> Yes, the C64 has true composite too,
> but not on the chroma leg. It has an
> extra leg for that. Have a look here:
>
> http://sta.c64.org/cbmmonc.html
This is interesting. When I got my first 64 (back about '84 or so), I
noticed in the User Guide (or somewhere) that one leg of the standard
CBM S-video cable had composite also. Since I had (have) a 1702, I
plugged that leg into the front jack to find out how superior s-video
was to composite.
Result: It worked,
and on my 1702 the composite was just as good as
s-video. (Which is excellent on my 1702.)
Maybe things changed later.
salaam,
dowcom
To e-mail me, add the character zero to "dowcom". i.e.:
dowcom(zero)(at)webtv(dot)net.
--
http://community.webtv.net/dowcom/DOWCOMSAMSTRADGUIDE
MSWindows is television,
Linux is radar.
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| Re: C64 hardware problem [message #106531 is a reply to message #105707] |
Fri, 25 March 2005 15:00 |
Stefan Pohlmann
Messages: 23
Registered: March 2005
Karma: 0
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Junior Member |
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bud wrote:
>
> 'Lo Stefan:
>
>> Yes, the C64 has true composite too,
>> but not on the chroma leg. It has an
>> extra leg for that. Have a look here:
>>
>> http://sta.c64.org/cbmmonc.html
>
> This is interesting. When I got my first 64 (back about '84 or so), I
> noticed in the User Guide (or somewhere) that one leg of the standard
> CBM S-video cable had composite also. Since I had (have) a 1702, I
> plugged that leg into the front jack to find out how superior s-video
> was to composite.
>
> Result: It worked,… and on my 1702 the composite was just as good as
> s-video. (Which is excellent on my 1702.)
>
> Maybe things changed later.
You are right. The early models had Audio/Video-ports with less pins,
IIRC 5 pins.
--
My e-mail-address is valid and doesn't need to be adapted.
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| Re: C64 hardware problem [message #106565 is a reply to message #106531] |
Sat, 26 March 2005 03:29 |
dowcom
Messages: 773
Registered: July 2003
Karma: 0
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Senior Member |
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'Lo Stefan:
Group: comp.sys.cbm Date: Fri, Mar 25, 2005, 9:00pm (CST+7) From:
pohli.nospam.usenet@gmx.de (Stefan Pohlmann)
script:
> You are right. The early models had >Audio/Video-ports with less pins,
> IIRC 5 pins.
Yes. I don't know if that 64 had 5-pin AV or not. I only know that the
cable (which I still have) is 8-pin.
Doesn't seem that it would go into a 5-pin port?
salaam,
dowcom
To e-mail me, add the character zero to "dowcom". i.e.:
dowcom(zero)(at)webtv(dot)net.
--
http://community.webtv.net/dowcom/DOWCOMSAMSTRADGUIDE
MSWindows is television,
Linux is radar.
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