I am fixing a Rocky and Bullwinkle for a friend, on startup, all coils fire in a sequence and dmd is not on. It may do that a few times or only once. Once the game boots up, start a game, the launch button does not work and niether do the flippers. As far as the flippers go, it is not the flipper board, switched it out with a known working board, same problem.
A few weeks ago it would just keep firing the balls out and all coils would fire in sequence. I found the solder on the pins for the relay that is on the playfield power board cracked. Once solder was removed and reflowed the game worked fine for a couple of weeks until this happened.
He has a lethal weapon 3 which has the same boards, can I switch them out one at a time for troubleshooting? What could be the likely problem? CPU or playfield power board?