A single six-digit display shows nothing at all.

One six-digit display completely dead

Cause: Each six-digit display uses two UDN6118 driver chips on its own board; one of these may have failed.

Checks

• Swap the display position with a known good one (power off) to confirm the display is at fault.

Fix

• Replace the UDN6118 chips (NTE2021 is a substitute).

System 80/80A displays run on about 60 V DC; switch the game off before unplugging or touching a display or its connector.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• Using a Taxi/Police Force display board in another 16-digit game
• Restoring brightness on 4, 6 and 7 digit display boards
• Alphanumeric segments still missing: the UDN chips
• Missing segment on one or more score displays
• Missing digit on one or more score displays
• Gottlieb System 80: bottom segment missing on one display that follows it: replace Z1
• Display chips on the CPU board fail after swapping displays
• Display fault: board or display?

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)