Quoted from nugsy:
Question about troubleshooting light boards: the leftmost stand up in the center 3-bank has gone out ("Advance" in "Advance Escape Route"). When I first got the machine, it was working according to pictures I have. I replaced the bulb and cleaned off the connections to the twist socket on both the socket pins and board connector with no success. I traced the wiring about as competently as I could, reseated a few connectors as well as the light matrix headers in the backbox. I didn't notice any burnt pins or otherwise obviously bad connections.
What might a T2 veteran recommend looking into next? T2 is for all intents and purposes my very first pin and I am learning a lot about repair as I go. Any advice is welcome
Start at the source and work back. First remove the plug from the light board. Then test the socket flanges via DMM continuity. Then, test continuity with a DMM from the pins on the board to the socket solder "half moons" (where the flanges twist in). Then, test continuity from the plug end that goes to the light board, to the plug end that goes to the backbox board.
My guess is that you have a poor connection at the board somewhere. Either the pin to the socket receptacle, or the socket to the receptacle.
Oh, and make sure the light bulb/led is working before anything.