Ok I have a Space Invaders machine most everything works. However I cannot seem to get some of the lower play field lights to work no matter what i do. Also only about 1/4 of the infinity back glass lights work. I have replaced the aux lamp board and the rectifier board. This fixed a couple issues. I found two blown transistors one on the lamp driver board. Replaced them. Re soldered all connectors and re pinned all rectifier board plugs. What else is there? I have checked every bulb and every fuse. Not able to get any further. Could the transformer powering the rectifier be putting out weird voltage? Could one of the ic chips on a lamp driver board be bad? All sounds, scoring, and solenoids work perfectly. Displays were replaced and work perfectly. Could the mpu board be bad?

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A direct match to the one I had in the machine that had a bad transistor. I then replaced the transistor in my old board and still the same problems. I tried the new board and my old one with the replaced transistor. Same results

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Yep resoldered all of then today on the aux and regular lamp driver boards.

What’s the fix for that? Any ideas?

Yes i check those its like total sections it seems on the same circuit or common circuit

Ok after looking at the lamp driver board schematic all play field lamps that do not work go to the same IC chip. So I ordered a new main lamp driver board. Let’s see what happens.