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I've been trying to repair my G4 MDD power supply for awhile now and not sure what exactly to replace on it. I've replaced all the caps except for the 3 big 450v ones. I know that the mosfets also should probably be replaced (presumably the ones on the heat sinks). Not sure if anything else...

The cap leakage seemed to be minimal. There was no battery bomb. I will take a look for broken traces around the ROM maybe. I did try a ROM simm from my se/30 and jumped the pins to use the rom simm but there was no change. However I did not both the 12v line and 5v line were a little low.

I’ve got this iisi that displays a yellow screen on boot up with no chime or anything else. I’ve recapped the power supply and the logic board. I’ve removed all the ram and this is the board with the rom on the board. I’m not sure where to go from here. Any ideas?