In TheRetroChannel’s latest video, Mark dives into a C64 repair mystery that challenges his skills and patience. What starts as a simple curiosity turns into a multi-hour saga of diagnostics, false leads, and ultimate triumph. After discovering a half-Australian aftermarket Commodore 64 case, Mark realizes the machine inside is far from functional—and the real adventure begins.
Early inspection reveals missing chips and no power output. Through a series of meticulous voltage checks and visual inspections, Mark tracks down culprits including a dead RAM chip, a faulty power switch, and—most elusive of all—a broken trace hidden beneath the silkscreen. Despite the machine passing most diagnostics, EasyFlash cartridges and DesTest switching refuse to cooperate. This C64 repair mystery drags on as every logical suspect—CIA chips, PLA, ROMs, even potential signal interference—is ruled out one by one.
Just as the situation seems hopeless, high-resolution photos and a fresh perspective expose a sneaky broken read/write trace under a capacitor. Restoring this single line brings everything back to life, including full cartridge port functionality. And for a final polish, Mark installs a new RF modulator and luma bypass board, significantly enhancing video output.
This episode isn’t just about fixing hardware—it’s a deep dive into the thought process, grit, and occasional lucky break behind retro repairs. For enthusiasts and tinkerers, it’s a masterclass in methodical troubleshooting with a healthy dose of Aussie charm and dry wit.
