Just got a routed Pinbot that was in decent shape and need some help troubleshooting the GI lights in the backbox. I've LED'ed the game and the computer controlled lights in the backbox and the flashers work fine. What I can't seem to figure out is why none of the GI lights don't work (GI and computer controlled lights on the playfield work fine). Here's what I've done so far:

Reseated the two molex connectors for the lights that goes back into the backbox proper
Reseated 1J4, 1J5, 1J6 and 1J7 on the CPU board
Checked all 4 fuses in the backbox
Jiggled the wires that go to the GI backbox lights

Anything else I should check?

I pulled all four of the fuses and checked them with my multimeter. There were all 5 amps and all but one were 250 volts. One was 32 volt and I changed it out with a 250v fuse but it didn’t fix the problem. Any particular spots I need to check voltage on the lights. It doesn’t look too clear where I should check on the power and/or CPU board.

I think I've traced the problem to the harness that plugs into the power board. The molex connector showed signs of a burnt pin. I reseated the again and got my backbox lit up. Now I'll order a new connector housing repin all the connectors and hopefully that will fix it permanently. Oh, as a side note, LED's really make a difference.

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