Several controlled lamps don't light on a game that has been sitting unused.
Some controlled lamps out: cold solder joint on the lamp driver board connector
Cause: A cracked (cold) solder joint on a header pin of the lamp driver board connector.
Checks
- Inspect the lamp driver board's header pins closely for ring cracks around the pins.
- Check which lamps share the affected pin's row or column.
Fix
- Reflow the cracked header joint (or replace the header pins).
Systems
Games
Related tips
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- Substitute SCRs for the lamp driver board
Source: Pinball Repair help group!! (Facebook group)