The upper flipper stopped working (after a loose coil diode had been reattached). The coil has voltage and the fuses are good, but the flipper board LED for the upper flipper does not light when the button is pressed, while the other two do.
Upper flipper dead and its flipper board LED never lights: dirty cabinet button switch
Cause: The cabinet flipper button on that side uses a double switch stack, and the contact that triggers the upper flipper was dirty, so the flipper board never got the signal.
Checks
- Watch the flipper board LEDs while pressing each button: an LED that never lights points to the button switch or its wiring, not the coil.
- Check whether the button has a single or double stack and test each contact pair.
Fix
- Clean (and gap) the cabinet flipper button switch contacts.
Systems
Games
Related tips
- Flipper sometimes stays up until power off: broken coil diode
- Left flipper stays up until power off: faulty flipper board
- Flipper board LEDs show the cabinet buttons are seen
- Lower right flipper cuts out for a few games at a time: faulty EOS switch
- Solid state flipper has no power though fuses are good
- Measuring voltage at a solid state flipper coil
- Solid state flippers dead, weak or intermittent: clean the switches
- Solid state flipper stays up only after the button is first pressed
Source: Pinball Repair help group!! (Facebook group)