Segments are missing and the R1-R14 resistors test good.

Missing segments: check the UDN7180 with a probe

Cause: A bad UDN7180, its input chips (4558) or the board connector.

Checks

• With high voltage removed, probe the UDN7180 inputs (pins 2-8) for pulses. None: suspect the connector or input chips.
• Probe the outputs. Pulsing inputs with dead outputs means a bad 7180.

Fix

• Replace the failed chip.

The display supply carries about 100 V DC (plus and minus); keep fingers and probes off the master display board and power supply high-voltage section with the game on.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Segment resistors keep burning
• Bottom segments missing and master display resistors burning: shorted display glass
• A segment missing on a score display
• A half-working UDN7180 can still be used
• Whole digits missing
• Four digits missing on the player 2 and 3 displays: bad driver IC12 on the master display
• Score displays dead but digits glow: bad wire in the CPU blanking plug (1J3)
• Master display board versions

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)