I had problems with old score displays with burnt spots, burnt traces on the board, burnt resistors, mismatched models, etc.. Nothing working proper and this is machine I am trying to restore so I bought a replacement 5 pack from Wolffpac Tech. Now I have soldered everything together and installed and none of the new displays working.. The fuse on the solenoid board has connectivity and was recently replaced and intact. Does anyone have suggestions on what it could be. It was wasn't previously working perfectly but I had 2 to 3 numbers flickering in each board.

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Shackler: I will contact manufacturer about possible step I was not aware about but more about what you indicated earlier, to clarify, both J1 pins on the MPU and J1 on the lamp driver board affect the score displays?