The power to the entire game flickers off and on and then fails completely. The fuses look fine.

Whole game flickers off and on, then dies: burnt ground pin at the power supply board

Cause: The ground pin on the power supply board connector had overheated and burned, so the ground connection for the whole game was intermittent.

Checks

• Look at the power supply board connectors, especially the ground pin, for browning or burn marks on both halves.
• Check the fuse clips: if a fuse pulls out easily by hand, the clip tension is too weak.

Fix

• Replace the burnt header on the power supply board and the matching pin (or the whole housing) on the cable side.

Unplug the game before working on the power supply board.

Systems

• Williams System 11A

Games

• Pinbot

Related tips

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• Power supply board fuses (typical game)
• +5 V fuse blows the instant the game is switched on
• Blown high-voltage display fuse in the backbox
• What the System 11 power supply board feeds

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