Ursprünglicher Beitrag von: James Van Damme ,
Probably a cracked circuit board somewhere. They can be very hard to find and very tiny. Trace around with a voltmeter and see if you can find where the voltage comes back. If you can’t find it try putting a jumper wire from the good side to the bad side. Get a schematic or wiring diagram, or draw one yourself so you understand what’s what.