Uploaded September 2025 | Updated September 2026, 2 weeks ago

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Commodore 64 Repair – When It’s Not the CIA or the PLA...

This C64 arrived with a blue screen and a few suspicious past repairs, including chopped ROM legs and a mismatched CIA chip. After a quick inspection and a few educated guesses, I started working through the usual suspects: CIA, ROMs, CPU, PLA...

But even after swapping and testing most of the major ICs, the machine still wouldn’t boot correctly—until I tried one last thing.

This repair takes a few twists and turns, and ends with a surprising culprit


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