I picked up a NASCAR at Midwest Gaming Classic a few months ago and have been trying to fix it. My pin was apparently highly abused at a Chuck E. Cheese during it's prior life and virtually everything on it was broken. I've fixed just about everything but couldn't get the Garage Release Coil Q5 or the Inner Orbit Post coil Q23 to work no matter what I tried. Finally decided to take a look at the I/O board and was shocked but what I saw.
Take a look at the hack job somebody did - multiple scorch marks on the board, drive transistor replacements made with leads left untrimmed and jumper wires attached to them on the back side of the board with big blobs of solder. Some of the jumper wires were nicked and the ends had frayed copper strands that were actually touching adjacent wire traces. I was absolutely appalled!
This board is on its way to TwoBits.com for repair. Hope it is salvageable. This is a great example of why amateurs should not attempt to fix boards.