Lee from More Fun Fixing It returns with another episode packed with retro repair action, this time tackling two stubborn Commodore 64s suffering from C64 Bad ROM Fixes. Both machines were last seen in his triage series, where diagnostics flagged one with a faulty BASIC ROM and the other with a bad kernel. Armed with patience, humor, and a new Yahua 948 desoldering station, Lee takes on both boards in a detailed hands-on session.
He begins by addressing the BASIC ROM issue, demonstrating how a blank blue screen often signals ROM failure. After confirming the fault using DesTest MAX-Switch, Lee removes the damaged ROM, cleans the board, and installs a socketed replacement. The machine powers up perfectly—save for a reluctant spacebar. A quick keyboard contact clean will solve that. With the first computer now running, it’s on to the second.
The second board proves trickier. Although it initially seems like another simple case of C64 Bad ROM Fixes, diagnostics reveal deeper problems with CIA chips and edge connectors. Lee methodically tests components, tracing signals through the U15 74LS139 chip and verifying chip select lines. Along the way, he offers a candid correction to a previous misunderstanding of the circuit, turning the episode into both a repair guide and a learning moment.
After plenty of desoldering, socketing, and testing, Lee identifies the real culprit—a faulty CIA chip. Once replaced, both machines are restored to full working order. The process showcases his pragmatic approach, technical insight, and genuine enjoyment of the hobby.
The episode wraps with Lee thanking his Patreon supporters and collaborator Paul for supplying the faulty boards. For anyone interested in the satisfying world of Commodore restoration, this repair session is both entertaining and informative.
