I cleaned ALL the IC chips that were removable EXCLUDING the game ROM chips. You can do the game ROM chips if you want I just had a hunch it was the other chips because several were rusted. Example of the chips cleaned with a pencil eraser are circled:

  • Game fixed see Repair History

Owned by Wow that’s RAD

I know the owners that picked up a Galaga for a good price.  It played once but now the game does not display.  Turned out to be the IC chips were very dirty and needed cleaning. Check out the Repair History for details.