After a solder repair under the playfield, most playfield lamps went dark and a few blink weakly. Sound and startup are normal and no fuse is blown.
Most playfield lamps out or weak after a repair: reseat the backbox connectors
Cause: A backbox connector had been disturbed and was making poor contact.
Checks
- Look for solder splashes near the repair first.
- With the game off, unplug and replug every backbox connector.
Fix
- Reseat all the backbox connectors, and repin any that stay loose.
Systems
Games
Related tips
- Several neighbouring lamps out on an under-playfield lamp board: dirty socket contacts
- No general illumination after a new rectifier board, fuses good: check the bulbs
- Maze lights flicker or go dark when flippers fire: loose fuse holder
- Lamps on the auxiliary lamp driver board do not work
- Some controlled lamps out: cold solder joint on the lamp driver board connector
- Controlled lamps stuck or not flashing: reflow MPU and lamp driver header pins
- Playfield GI drops out when the flippers fire: loose ground wire near a lamp
- LE: middle playfield lamps dead, check the hidden fuse block
Source: Pinball Repair help group!! (Facebook group)