Been doing a bunch of research, and before I go replacing all kinds of connectors and reflowing solder all over the place, I thought I'd try to narrow things down.
I got readings for AC voltage at transformer plug, plug into PSB, and also at pins heading out of the power supply. I haven't checked the relay yet, but if the pins going out of the power supply read voltage, should I?
Here is a small piece of info that hopefully will help guide your advice:
When I tested the voltage of the wires for the working GI circuit (purple/white-purple) and the non-working circuit (yellow/white-yellow) i got slightly different results. I did this by putting my black lead on cabinet ground and red lead on wires where soldered to lamp sockets at various locations.
Purple wires = 6.5
White-Purple wires = 11.9
Not working GI:
Yellow wires = 6.5
White-yellow wires = 6.5
Any ideas of what order I should reflow parts or replace?
Also of note: only one circuit of GI in the backbox is working. Green/White-Green. The other 3 circuits (yellow-green+red, Yellow-Black+Red-Black, and Yellow-Red+Red-Black) are all out. Funny thing though. those three cicuits have diodes on each lamp. Also, my voltage reading jumps around all over the place. I figured I would deal with this after fixing the playfield GI unless it is all related.
Final weird thing. The white resistors just above CN 7 on the CPU seem to be getting fairly hot. Think that is unrelated because those are for lamp matrix (not GI). Still slightly concerned with how hot those are getting.