Looking for someone with some system 11 expertise ...
Not a single button on the service buttons inside the coin door are working
What I know:
I have 12 volts at the switch
All wires appear solid and connected
What I have done:
Shorted pin #9 on J205 to ground and to no effect
Replaced U16 with a new LM339 to no effect
Reflowed solder joints on U15 to no effect
Given that shorting the "enter button" pin to ground (on the CPU board) did nothing tells me that this is a board issue right?
Is replacing U15 the next logical step?
If it helps, I've noticed the call out "thank you" popping up in mid game randomly, and I'm pretty sure that's a coin up call out
You can see in the image that U16 needed to be replaced anyway (look under the battery holder in image 1) with the amount of corrosion that existed on the legs