To clarify, I have the longer boards with the shorter edge connector. Of course, the board I have for sale here is the other version, so I'm not able to test which board works better. I don't see a 3 pin connector, however.
For a moment, I was thinking a bad LM324. But, reading your post, it may be something else. This thing was caked with dust, everywhere! It might even be a dirty connection. I’ll scope it out. Thanks for the pointers!
When I got my Galaga home, the first thing I did was clean the edge connector AND plug with Electronics Cleaner. It rectified the fuzzy screen I was getting.
However, mine, too, has no sound. I'll post a seperate thread about the sound issue.
I just acquired a working Galaxian board that is missing the Fire and Explosion sounds. Which chips control these 2 sounds? With any luck, I can swap them out with 2 other non-working boards I have. Thanks!