None of the playfield optos work, the power LED on the opto control board is off, and a known-good opto board behaves the same.
Every opto dead and opto board LED off: check the J118 ground
Cause: The opto board was not getting a ground: 12 V was present at J118 but the ground wire had no continuity to the opto board.
Checks
- Confirm 12 V at J118 on the power driver board.
- Check continuity of both the 12 V and ground wires from J118 to the opto board.
- On the opto board, look for a leaked 100 uF capacitor that has eaten the power trace.
Fix
- Make up a new J118 connector and repair the ground wire to the opto board.
Systems
Games
Related tips
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- Opto switches dead all at once
Source: Pinball Repair help group!! (Facebook group)