Commodore CBM 8032: Help with repair

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webwurm
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Commodore CBM 8032: Help with repair

Post by webwurm »

Last year I got a Commodore CBM Model 8032. I like that old computers really, but it needs some work.
One thing that I can't solve myself - or I at least need hints were to start - is, that the screen shows characters in every 2nd column, right after switching on. And if I type, even the typed in character changes. I hope it is visible in the picture.
CBM_working.JPG
CBM_working.JPG (96.5 KiB) Viewed 4519 times
I already took out the mainboard and cleaned it completely - but it seems some chip has an issue. Can anybody lead me to the direction which one it is and how to test it (I even have a oscilloscope at my disposal).
Here is the mainboard of the computer:
The attachment CBM_board.JPG is no longer available
Btw.: Shortly after I picked it up from the post office it worked - but only for an hour or so:
The attachment CBM_working.JPG is no longer available
The working computer - sadly that didn't last too long.
Can anybody help?
Thank you very much!
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LoneWolf33
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Re: Commodore CBM 8032: Help with repair

Post by LoneWolf33 »

Well, the picture shows only a normal startup screen :wink:
At least for me this is the only picture that appears in your post.

There might be a problem with the CRTC chip memory access.
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