having some very funky results.
cut wires off of j4 connector at mpu. stripped and crimped new pins into connector. double checked color codes to wires in proper position. traced wires with meter to make sure they went were they should and no cross connections.
removed pins from board on j4. cleaned area with fiberglass pen so nice and shiny. used a little bit of flux and soldered new pins to board. tested to see if any were cross connected with a meter and also confirmed they were connected to what needed to be.
first test, got flicker but no flashes.
disconnected from board and started running jumpers from connector to board. started with gnd +5, unreg, 43 volts and it booted.
started plugging all the other wires in and it still booted fully connected with jumper wires. the board at this time was resting on a piece of paper in the bottom of the head unit. I lifted the board so it was now in a vertical stance and it stopped booting.
disconnected one of the 5 volts inputs and the game would boot. swapped with the other 5 volt input and the game booted.
removed all jumpers and and took 5 volt inputs one at a time out of connector and the board does not boot. removed them both and tried to jump the 5 volts from tp3 on solenoid to tp5 on mpu and I get the led locked on. was wondering maybe intermittent connection on caps from 5 volt bus with maybe an intermittent cap there shorting?