Three of the score displays go dark and the remaining one will not show high scores; player 1 still works.

Three displays dead and no high score shown: solder blob on a display connector

Cause: A blob of solder on top of a display connector was shorting the other displays' lines, and it burned out several of the small glass 4.7 k resistors next to J1 on the MPU.

Checks

• Swap the working display into the other positions to tell display faults from wiring faults.
• Inspect each display connector and header for solder splashes or shorts, especially after repinning.
• Measure the small resistors near MPU connector J1; burned ones read open or far off 4.7 k.

Fix

• Remove the solder blob, replace the damaged resistors on the MPU, and recheck all displays.

The displays run on high voltage (around 190 V DC). Power off and let the supply discharge before touching display connectors.

Systems

• Stern MPU-200

Games

• Galaxy

Related tips

• Credit display copied to player 1, game won't start: coin door wire shorting to ground
• No score displays light at all
• F2 blown, no display high voltage at TP2
• One or two score displays completely blank
• Flickering score displays
• Replace a score display glass
• Bally and Stern score display boards
• One digit missing on a score display

Source: Pinball Repair help group!! (Facebook group)