C64 Pictorial Fault Guide. The Pictorial C64 Fault Guide Be sure and match up any faults with what you are observing using the pictorial fault guide. The test will start automatically and cycle through each of the checks
The Pictorial C64 Fault Guide from www.pictorial64.com
Description 'Out of sync' screen instead of normal startup The Pictorial C64 Fault Guide General tips - ROM (U3 - U5) It's not particularly common for the ROM chips on a C64 to fail, but it does happen occasionally
The Pictorial C64 Fault Guide
The kernal has the highest running temperature of the ROMs, and also tends to be the most likely to fail, followed by the Character ROM Failed 74LS629 Oscillator Chip Desoldered from Position U31 on a Commodore 64 Circuit Board To run the test, simply boot your C64 with the diagnostic cartridge plugged in or select and run the program from the Kung Fu Flash or similar SD-card device
The Pictorial C64 Fault Guide. The Pictorial C64 Fault Guide General tips - ROM (U3 - U5) It's not particularly common for the ROM chips on a C64 to fail, but it does happen occasionally Failed 74LS629 Oscillator Chip Desoldered from Position U31 on a Commodore 64 Circuit Board
The Pictorial C64 Fault Guide. Via Hacker News, a probably quite useful visual gallery of failure modes of the Commodore 64: c54-u5_5 800×599 57.5 KB The kernal has the highest running temperature of the ROMs, and also tends to be the most likely to fail, followed by the Character ROM