left/right flipper switches (detection) not working - switch test and confirm. then check out the flipper board for issues. usual "help" files have debunking steps.

There have been 3 threads about this (or something close to this) in the past 2 days.

I will pass along my past experience. I had a Last Action Hero where the flippers worked fine, but inputting initials or a custom message in the setting was a jerky mess (sometime a flipper button wouldn't change the letter...other times it would jump 2 or 3 letters). It was an issue with the flipper board. I don't know what....but it wasn't as easy as a fuse. It needed board work done to correct the issue. The flipper board is in the lower cabinet, almost halfway back on the left.

its a isolator circuit that went bad in your case. typically a single chip or a resistor that melted out or cold solder due to dissipation of heat issues.

Watch this handy instruction video!!

other thread helped me remember this stuff.. first check your EOS switches that they havent broken /are contacting.

I hope that fixes you up. I figured this problem was long resolved.

Yeah, don't call that guy again...

Post a pic of the black wire insitu.
Then we can figure out where it might go.
As noted, the SSFB is also on the switch matrix. When a flipper cabinet switch is grounded, the SSFB indicates the switch closure to the MPU.

There are two TO-92 case transistors in this circuit, but connectors are always the first suspicion.
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Chris Hibler