Dead displays with an orange glow are not a power fault
If dead score displays show a small orange glow in one corner, they are getting their high voltage, and the fault is elsewhere (driver chips, display driver board or CPU), not the power supply.
Systems
Related tips
- All score displays dead
- One score display dead
- Digits burning or faint on players 1 and 3 (or 2 and 4)
- Score displays dead but digits glow: bad wire in the CPU blanking plug (1J3)
- Score displays weak, dim or dead with fuses good
- Display driver board versions
- Upgrade R2/R5 and check R1/R4 in the display supply
- Master display board versions
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)