The flasher above the upper right flipper keeps burning out, scorching or melting the plastic above it; even an LED replacement fails.

Flasher over the upper right flipper melts its plastic: the flasher is stuck on

Cause: The flasher is locked on at full power rather than strobing, usually from a shorted TIP102 driver transistor, or from a bad ribbon cable to the board that drives it.

Checks

• Confirm in play or flasher test whether the lamp stays fully lit.
• Find which TIP102 drives it (it may be on the 8-driver auxiliary board) and diode-test it.
• Reseat, and if needed replace, the ribbon cables between the boards.

Fix

• Replace the shorted driver transistor or the faulty ribbon cable, then fit a new bulb. Don't fit a new plastic until the flasher flashes normally.

Systems

• WPC Fliptronics

Games

• Twilight Zone

Related tips

• Left mini-playfield magnet dead, about 8 V at it: F101 blows, shorted Q26
• No flashers work
• One flasher never lights
• WPC coils need no diode except the flippers
• A flasher stays on or is very bright
• Driver transistor dies after fitting a coil that has a diode
• No coils, lamps, GI or flashers but display and sound work: check blanking
• Resets during the Powerball battle: reseat J101 and J115 on the power driver

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