C64 Blackscreen

Got an issue?
BooX_X
Member
Member
Posts: 1
Joined: Mon May 15, 2017 3:00 pm
Contact:

C64 Blackscreen

Post by BooX_X »

Some days ago I started my C64 and it ran just fine. Some time later I decided to change to my color display. After that I got a screen full of colorful garbage, so I started it again and it just displayed a black screen (or white, depending on the screen brightness). I measured the power supply and it's all right. I think it's probably the PLA chip, because I read that problems like this often point towards a bad one, but I'm not sure. Is there a way to test the PLA chip or could it possibly be something else?


User avatar
eslapion
Active Member
Active Member
Posts: 1215
Joined: Mon Jul 20, 2015 10:11 am
Location: Canada
Contact:

Re: C64 Blackscreen

Post by eslapion »

The black screen of death can be caused by all sorts of things. DRAM damage is often caused by faulty PSUs, the original Commdore PLA heats a lot so it fails often but I've even once seen a SID which was choking the databus.

Faulty kernal or BASIC ROM chips can cause it too.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
Lenkapo
Member
Member
Posts: 9
Joined: Mon Jun 14, 2021 8:56 pm
Contact:

Re: C64 Blackscreen

Post by Lenkapo »

Are there any chips that run particularly hot? If so they are mostly faulty. This doesn't include the VIC II or the SID they run hot because they use additional 12V (At least on the "long boards"). Which revision of Commodore 64 is it?
Post Reply Previous topicNext topic

Who is online

Users browsing this forum: No registered users and 12 guests