Museum of the Game® & International Arcade Museum® Forums

I got a Mechanized Attack PCB and trying to make a JAMMA adapter for it. Pinout is attached. I was able to test it and the board boots but I can't get it to sync. I've tried two different cabinets with the same result. Other PCBs work fine. I've checked continuity on all wires on the adapter and they look good.

On the pinout there is only Video R/G/B and sync. There isn't a video gnd. So on the JAMMA side, that pin isn't connected to anything. Could that be the issue? If so, what do I connect it to? Just the regular GND on the adapter ?