pcb repair

Hi all, I have a pre jamma version of slap fight that’s giving me some problems. I don’t know what to start looking at first so any suggestions appreciated.

So I picked up a Raiden Fighters Jet yesterday, and it's near totally dead. On powerup it briefly flashes a white screen and then it goes black. For a while it was holding the white screen, occasionally blue or teal, and once or twice a carpet pattern. Now, just the brief flash, which is less...