One flipper stops working all at once. Its fuses test good, the mechanism doesn't bind, and the cabinet button still works in the menus, but the flipper board's LED for that side doesn't flash when the button is pressed.
Right flipper suddenly dead, no LED on flipper board: dirty, corroded EOS contacts
Cause: The end-of-stroke (EOS) switch on that flipper had dirty, slightly corroded contacts. The solid state flipper board needs a good EOS switch, so a bad one can stop the flipper from firing at all.
Checks
- Watch the flipper board LEDs while pressing each flipper button; the dead side not lighting points at its switch inputs.
- Confirm the cabinet button works (for example by using it in the service menus).
- Briefly jumper the two EOS switch wires together and see whether the flipper starts working.
Fix
- Take the flipper assembly apart, clean the EOS contacts (alcohol was used here) and adjust the switch.
- Replace the EOS contacts if they are worn or pitted.
Games
Related tips
- Flipper board LEDs show the cabinet buttons are seen
- Solid state flipper goes up but will not stay up
- Solid state flipper stays up only after the button is first pressed
Source: Pinball Repair help group!! (Facebook group)