None of the GI lamps light, the fuses test good and the 6.5 V AC GI supply reaches the board; the black lights don't work either.

All GI out with good fuses and 6.5 V AC arriving: the bulbs themselves were burnt out

Cause: Almost every GI bulb in the game had burnt out, and the black light tubes' starters had failed.

Checks

• Measure the GI voltage at a socket, then try a known-good bulb in it before chasing relays and connectors.
• For the black lights, check the fluorescent starters.

Fix

• Replace the burnt-out GI bulbs (many owners fit LEDs) and the black light starters.

Systems

• Sega/Stern Whitestar

Games

• Viper Night Drivin'

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