On a 6803 dual display module, one segment stays lit on every digit and the other display on the same module also misbehaves. With that module unplugged the other display is fine, and the fault follows the module to another game.

One segment always on and the other display corrupted: replace the 74HC373

Cause: A failed 74HC373 latch on the display module. It passed a plug-in chip tester but was still bad.

Checks

• Move the module to another game to confirm it is the module.
• Check the segment's driver transistor and resistors.
• Use a logic probe on the 74HC373 outputs and compare with a working segment.

Fix

• Replace the 74HC373 even if a chip tester says it is good.

These displays use high voltage; work on the module unplugged.

Systems

• Bally 6803

Games

• Hardbody

Related tips

• Why 6803 alphanumeric characters look odd
• 6803 games with 9-segment alphanumeric displays and Turbo Cheap Squeak
• 7-digit display driver boards use discrete parts
• Score displays show garbage now and then

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