C64 Blackscreen

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C64 Blackscreen

Post by BooX_X » Mon May 15, 2017 3:15 pm

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?

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Re: C64 Blackscreen

Post by eslapion » Fri May 19, 2017 1:35 am

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.
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