Hello,
I have a twilight zone with a flipper issue I've not seen before. Last week the flipper buttons both stopped working mid game. I checked the fuses for continuity all good, checked connectors on board solid, checked switches in test mode eos switch works on all four, checked flipper test and all four respond and hold properly, the flipper buttons don't register at all in any switch test opto not registering. all other coils fire, optics work, and magnets respond too. I'm stumped. What am I not seeing. Thanks in advance

the flippers in test mode work so I will order a new set of flipper opto boards. Thank you

Thanks for assistance, I checked the flippers in test mode and they all worked so I guess I'm ordering a pair of new opto boards for the flippers.

So I received New opto boards and installed at the flippers no change in inoperation at the buttons, no signal in switch test, when button(s) are pushed. where do I go to check the 12v and how?