Got a call to look at a 2014 JJP WOZ. I had seen this game before but it was to troubleshoot some features not working. The game booted OK so I wasn't into the electronics other than a bad opto. Mostly re-plugging connectors back in.
This time the game is dead. Coin door lights lit, no display, no playfield lamps, board led's all seem lit at first glance. Sent a quick text to Lloyd for his expertise. Thank you big fella!
Looking at other posts on the subject and Lloyd's advise I took a quick shot at the reset trick. Not the problem. OK, now I get to use all those years of troubleshooting experience. (Getting lazy and was hoping not to go there).
What do you do? Check voltages on the Unified Power Source Board. +5 and +3 good. +12 missing. OK now we know why it doesn't boot.
Fuse F6 Good but the LED under it was out. Checking found no +12 on either end of fuse holder. Looking at the circuit schematic to understand the specifics I then took a good look at the pcb. Q21 blown and some other damage. Can not tell if the Synchronous Buck Controller is damaged. I hate SMT. Time for a new board.
What took it out? I'm guessing a Surge.