Quoted from Robotworkshop:
Have you pulled the MPU board to check the edge connectors? On mine I had to clean all of those, fix some battery damage, re-pin the power connector. I also ended up replacing the larger cap in the base of the machine. Is there still an original battery on the board? If so remove it. I've seen some cases where a bad battery on a board was dragging things down. I hate batteries on boards and installed NVRAM on mine.
While having a spare board around for troubleshooting can help you may find you still have the same issues after dropping hundreds on a new board. I'd also check all the grounds on the boards. I haven't done ground mods on mine yet but did ensure they were all making a good connection. At the very least you may want to unplug and reseat each of those ground connection cables that plug in at the back in the base of the machine.
The mechanics of these games are solid. Once you work through the electrical the rest is too.
The mpu was loose, along with a few other boards, when I first looked at this. I didn't clean any edge connectors so I'll try that. The original battery is indeed still on the board.
I think we were also talking on facebook; I'm getting no boot now. Bummer.
I pulled the mpu to check edge connectors again and they already looked fine but I used an eraser on them again to be sure. No change in the game. Only GI now. Fuses all test good.
Checked the big cap in the base of the machine and pulled a solid 12.95V. I'm fine with just assuming this is a board issue and sending it off or replacing, just want to make sure I check off all the other things that could have caused this behavior first. Although, with it not booting at all now.. not sure I can really test anything until boards are sorted. Not sure what damage I did to these last night, but it's doing nothing now.
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Also, I'm assuming the ground for the reset board goes here, is that correct?
Having duplicate games so boards can be dropped in is great. That's what allowed me to quickly figure out that my roy was otherwise working and just needed a working board (well, that and an unobtainable drop target). He does have a Mars God of War but afaik that's as close to 80B as either of us has.