smash tv

Helping a friend revive this Smash TV I have it hooked up in my NEO-GEO cab (with a JNX adapter). PSU is a confirmed working Meanwell MWP-606, so no issue there. I've turned up the PSU so the PCB is reading 5.05v at the Jamma edge (measured on the board) PCB won't boot and I don't notice any...