tuf Posted January 15, 2017 Share Posted January 15, 2017 I'm wondering what might be the cause of this sort of character corruption: It only happens to the 1st column - the remainder of the screen is fine. I suspect it's heat related b/c it takes a minute or two for it to appear from a cold start of the C64. Seems to happen more frequently with the Fastload. BTW this is a stock C64 with a 1541 Ultimate II. Quote Link to comment Share on other sites More sharing options...
David Baldwin Posted January 15, 2017 Share Posted January 15, 2017 that might be the cartridge unplug it and clean the pins both sides, take the top of the computer give it a good clean inside and push the chips in the sockets tight. That happened to me and dry joints on th PCB to fix, you will find the problem. Quote Link to comment Share on other sites More sharing options...
7800fan Posted January 16, 2017 Share Posted January 16, 2017 Does it still show up bad without any cart or accessories? Like other said, dirty or bad contact or bad solder in the port could be the issue if the problem goes away. If the problem does no go away, I'd check around the 64K RAM, video chip, and the color RAM. Take the 64 apart, plug it in, turn it on, and when the display shows glitch, press down on each of the chip to see if anything changes. Socketed chips varies and is very inconsistent, you most likely have socketed video chip and SID chip and nothing else so it will be lots of work to check and resolder. Since the error only exists in one column, it could be the issue with VIC Oh yeah, if the problem shows only with FC inserted, power supply may be on the low side. I'd check if there's 5v DC, it shouldn't be lower than 4.75v under full load (5% tolerance) as those touchy chips can glitch and fail. Quote Link to comment Share on other sites More sharing options...
eightbit Posted January 17, 2017 Share Posted January 17, 2017 Does it happen ever without the 1541 Ultimate inserted? If you remove the 1541 Ultimate, turn on the machine and leave it alone for say 30 minutes...does it still happen? Quote Link to comment Share on other sites More sharing options...
shoestring Posted January 18, 2017 Share Posted January 18, 2017 It's probably the 2114 colour ram or PLA. If you think it's heat related then try some freeze spray on the suspected chips. Quote Link to comment Share on other sites More sharing options...
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