In a new episode from the Triple Freedom channel, the team embarks on the challenging repair of a Commodore 64 plagued by a persistent pink screen—a common indicator of a faulty PLA chip. Initial diagnostics revealed irregular signals on specific PLA pins, prompting its replacement. Despite this, the machine remained unresponsive, pointing to deeper, underlying issues.
The repair process then shifted focus to associated components, including the U27, U25, and U13 chips. These were systematically tested and replaced as potential culprits. However, the pink or black screen persisted, defying expectations. A deeper investigation using an oscilloscope identified the true source of the problem: a malfunctioning kernel ROM. Specifically, pin 20 exhibited a flat signal, disrupting communication with the PLA and preventing proper operation.
Stay tuned as the episode details how this complex issue was resolved and the Commodore 64 brought back to life!
