Bought a LAH a while back and finally got around to fault finding and repairing the game. Was able to get a few hundred off the purchase price at the time, as multiple coils were firing at random times throughout game play.

Turns out the relay on the PPB was toast and burnt a few tracks as you can see in the photos. The relay installed on the PPB had a 24V AC coil which was open circuit and it's driver transistor on the MPU was also shot.

With the relay on the PPB faulty an unable to change state due to the open circuit coil, the game was firing coils instead of flashers. When it wanted to fire a flasher it wasn't able to switch to the flashers B circuit from the coils on the A circuit due to the bad relay.

With the old relay replaced and the board cleaned up, traces repaired and a new relay with a 24V DC coil installed, the game now functions correctly.

It's been so long ago that I last played a LAH, I had no recollection of the game play. Just finished playing a few games which I really enjoyed.

Unfortunately I didn't take photos after repairing the board. Next time I have the backglass out, I'll remove the board and take a few photos to update this post.
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