Several coils stop firing at once: the 50 V auto-launch, right scoop, right VUK, right turbo bumper and the knocker. Their switches work in switch test and replacing a coil and fuses changes nothing.

Launcher, scoop, VUK, one pop bumper and knocker all dead: failed TIP36C on the PPB board

Cause: These coils share a high-power supply switched by a TIP36C power transistor on the PPB board, and that transistor had failed. Unplugging the magnet board showed it was not involved.

Checks

• List the dead coils and find what they share on the schematic (supply, fuse, or driver).
• Check all fuses with a meter.
• Unplug the magnet control board to rule it out.
• Test the power transistors on the PPB board.

Fix

• Replace the failed transistor with a TIP36C. It is a PNP part: a TIP35C (NPN) looks the same but will not work.

Systems

• Data East CPU Version 3

Games

• Last Action Hero

Related tips

• 50 V coils use PPB TIP36c transistors, pre-driven from the CPU board
• Solid state flipper has no power though fuses are good
• Three-stage drive for 50 V coils
• Solenoid driver transistor positions on the CPU and PPB boards
• How a coil or flasher is switched: PIA to TTL to pre-driver to driver
• Solid state flipper very weak: power side has failed
• Flipper stuck up with power on (Playboy and later)
• Fliptronics flipper coil wired wrongly

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