Hi All,
I only bought my Super Pang (Bootleg) PCB a week or so ago and it worked normally, I removed my joysticks to clean out the gunk and swap a few Switches, everything worked with the machine open, I unplugged it and all I did was push the PCB back a little on top of it's plywood shelf and close the machine up, after switching it on again there was a horrible sound coming from the speaker and the screen showed a corrupt white screen with light blue blocks, I switched it off and on again and I saw a message saying RAM OK with lines across the screen, after switching it off and on again a few times I get different screens with corruption and sometimes the game seems to work, but there is no sound, about one time in ten it will start and work normal, sometimes at switch on it seems to be making corrupt sounds like in attract mode, but AFAIK attract mode sounds is off so it shouldn't be doing sound anyway until a coin is inserted, my initial thought was I may have pulled a solder point loose when sliding the board along the wooden shelf, but I can't see any loose.
Where do I go from here to try and diagnose the fault, I have a multimeter, (I think it has logic test) and I have checked I'm getting about 5.1V at the chips and just over 12V (forgot the exact voltage) but the voltages seem to be correct.
Thanks,
Chris.