Helping out a buddy. He is getting ready to sell his Cybernaut (his only pin) and is having an upper Flipper issue. I have a lot of games but not too many from this era.

Coil is good. Power is good. Switches are good.

Are the flippers driven by chip? It doesn't appear they are driven by transistor.

I thought that this would be easy fix so I stopped by after work with no schematic. So I figured bad transistor. I grounded all driver transistors and it appears that flippers are not driven by them. Couldn't get them to fire. Other coils did.

Again both bottom flippers work, just 3rd Flipper is out.

Any help is much appreciated.

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Could the relay on the board cause this problem?