With the backbox flasher connector J125 plugged in, coils pulse on their own and the backbox flashers are very bright; it had blown every backbox flasher bulb and melted C11 and bridge BR4. With J125 unplugged everything is normal.

Coils pulse and backbox flashers too bright: flasher power wire on J132

Cause: The single red-white flasher power wire was plugged on header J132 near the bottom of the power driver board instead of its home on J106 near the top. The two headers look the same.

Checks

• Compare every power driver board plug against the manual's connector chart or a photo of a correct board.
• Follow the red-white flash lamp power wire and check which header it is on.

Fix

• Move the flasher power wire to J106, then zip tie it to the wires beside it so it stays there.
• Replace any parts it damaged (bulbs, C11, BR4) and check the other plugs, since a second plug in this game was also on the wrong header.

Turn the game off quickly if coils lock on or pulse; a misplugged connector can melt parts.

Systems

• WPC Fliptronics

Games

• Black Rose

Related tips

• Check the AC power input connectors too
• GI string dead with a scorched connector
• Resets from worn power connectors between transformer, driver and CPU boards
• Gumball diverter, popper and two bumpers dead in test: faulty CPU ribbon
• GI connectors on the driver board
• Two wires on one GI pin
• Repair a burnt GI connector on the driver board
• Lamp matrix connectors on the driver board

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