Quoted from Jgaltr56:
Agreed. So Dmod said to not let the high voltage cable come into contact with any board. Sounds like an accident waiting to happen if high voltage can jump through insulation and blast a hole in a chip. Is that what happened here? The instructions do say to remove the cable but nobody ever does.
High voltage won't jump through the insulation. The IDC connectors used for DMD power cables have exposed metal contacts. A problem can result if the connector comes in contact or very close proximity to the circuit board. An accidental short or excessive voltage on the board can cause a chip to fail and become very hot, resulting in a burn in the package.
On WPC games, we recommend completely removing the high voltage wire harness from the game. You can alternately pull fuses and/or disconnect the harness from the DMD controller board, but this doesn't fully protect against a connector coming in contact with a board and shorting against something.
On Whitestar games, you can't remove the high voltage harness because 5V and Ground for the Whitestar board come through the same harness. You can remove the fuse from the DMD power supply board to reduce the chance of a problem, but still need to make sure the connector is tied back away from the boards to prevent an accidental short.