A group of controlled lamps next to each other stays dark even after repinning the lamp board connectors and reflowing its joints.
Several neighbouring lamps out on an under-playfield lamp board: dirty socket contacts
Cause: The individual sockets on the lamp board had dirty, weak contacts.
Checks
- Check for voltage at each dark socket; if it is there, the socket contacts are the problem.
- Check the lamp board header pins for cracked joints and the connector wires are fully seated.
Fix
- Clean each socket's contacts with a small screwdriver and bend them so they grip the bulb; replace any socket whose contacts are broken.
Systems
Games
Related tips
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Source: Pinball Repair help group!! (Facebook group)