My experience is also that a bad PSU is the root cause for many game board issues. The 5 Volt is very critical for all game logics, and it draws a significant current. So bad wiring can also be the issue.
So this what I would do:
* measure the voltages at the PSU without the game board connected (to make sure there is no major problem)
* measure the voltages at the game board, since there could be a huge voltage drop in bad wiring
Most games need to be within 4.9 to 5.1 V in order to operate properly. But that can vary a lot, so don’t see that as the only truth, just a general guideline. Bad wiring/connectors is usually causing resistance, and resistance causes voltage drop (Ohms law). So there could be one or two volts being waste from the PSU to the game board.
Usually there are also reference points at the game board that should be verified for correct voltages. Else you could measure the VCC pin at any random logic IC.
If all voltages are correct, my next step would be to check all socketed IC’s. Eroded pins can be the issue or just some glitch that could be solved by reseating them.
I would also look for bad soldering at the bottom side of the game board.
That should give you something to start with. There are plenty of us that would be happy to help you, preserving this (or any) game.
But yes, the Search function should also be used. Nobody at the forums like people coming from nowhere asking “My car doesn’t start, what is the problem?” without specifying any details of the problem nor the model of the car etc.
