A friend send me an Irem M72 with the multi M72 installed, having color issues on background and also pixel flickering.

Found a bad solder on multi bottom board

This fixed the flickering pixels.
Looking at the bottom board, I found a lifted pin on the custom KNA91H014

Reflowed it and colors was back

Found a bad solder on multi bottom board

This fixed the flickering pixels.
Looking at the bottom board, I found a lifted pin on the custom KNA91H014

Reflowed it and colors was back

The post was edited 13 times, last by futasan ().