A few weeks ago, I played a few games on my Pin*Bot after finally fixing the flipper buttons, which took me forever to get to, then turned it off for the night. When I turned it on the next day, instead of booting, the displays flickered nonsense, the speakers buzzed the 60 cycle hum at full volume, one of the relays in the backbox flickered on and off at a similar frequency, and some, but not all, of Pin*Bot's translite mouth lights stuck on. I've looked everywhere for a short, but I haven't found anything. Any ideas on what caused this will be appreciated!

The batteries haven't leaked. I installed a remote battery holder around two months after I got the machine (two years ago) and it was one of the first places I checked for a short. The wires are still attached as they should be and there's (fortunately) absolutely no acid damage on the board.

Bump to help me fix one of the best system 11 games!

I do have a volt meter. I'll check the voltage, but I'm fairly sure that there's a short or failed component somewhere due to the 60 cycle hum. I'm just not sure how to find it.

Bump! Does anyone know which component could cause this if it's not a short?

Sorry for the delay. I know that system 11 games have an audible 60 cycle hum even when working well, but when I turn on the game, there's no sound other than a deafening 60 cycle frequency at the loudest volume the speakers can produce, not a hum. I miswrote. The sound in unaffected by the volume pot.

I'm afraid to check the voltages, because the game seems as though it might be damaged by keeping it on for long enough to check them. I think that the primarily affected parts of the game are the MPU, which appears to be causing the controlled lamps to stick on and flicker, and something in the sound circuit. I'll try to take a video to show the problem.