playchoice 10 board

spanks_4

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Anyone work on single monitor pc10 boards? When I turn the game on the red led flashes and then nothing else happens. The power supply has been rebuilt and the voltages are sitting at 4.8v and 11.8v at the board.
 
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I pulled the z80, the ppu, and the other processor by the ppu. Sanded/cleaned the legs and reseated. Plugged the board back in and let it run to see if anything was getting overly hot and nothing was. I don't have any spare z80 chips to see if maybe this one is bad and not sure if I can reverse test it like I can with LS04 chips. Can I test the crystal with a MM?

Here is all the board does when it's turned on: https://www.youtube.com/watch?v=99fZJnE--Eg A single led blink and then nothing.
 
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Update: 8Y on the board had a grounded leg 6. Pulled the chip, put in a socket, and that fixed that. The Eprom at 8T was bad so replaced it with a 1.1 bios eprom and all is good now.
 
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