I'm pretty decent at troubleshooting the switch matrix but this one has me stumped. Working on a buddy's FBC and have it down to a few switches that won't register: Middle Pop Bumper, Top Pop Bumper and On Kicker. Switch test shows 4 (Top Bumper) stuck, I tested the switch / diode / capacitor with a meter and they test fine. I pulled the J2 connector and used a diode to verify that the stuck switch goes away and that all the switches above work properly when simulated with a diode on J2 so I believe the problem has to be on the Playfield. I unsoldered both wires going to the top pop bumper and the game still shows 4 as being stuck, and so am I! The problem doesn't form your standard square or rectangle on the matrix and all the voltages at the switch (from strobes) appear to be good, I also verified wiring from switches to the connector, headers have been replaced (not by me) and look really good including the solder joints under magnification. Suggestions for next steps to take please!
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