The hologram lamp never lights, even in test, while the hologram motors work. The 12 V supply is fine at the power driver board.
Hologram lamp dead: its 12 V wire is loose at the flipper opto board
Cause: The lamp's 12 V feed (grey/yellow) is daisy-chained through the right flipper opto board connector, where the wire had come loose.
Checks
- Measure both sides of the lamp socket to ground with the game on; both should show about 12 V.
- Follow the feed wire back and check every connector it passes through, including the flipper opto board.
Fix
- Reseat the wire properly in the connector (repin or reseat the IDC if needed).
Systems
Games
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Source: Pinball Repair help group!! (Facebook group)