I have a millionaire with display problems. The player 1, player 3 and credit/match displays are dark. The player 2 and player 4 displays work except for the 1st digit on each being completely out. To confirm that player 1 and 3 are not out gassed, I connected the display to another system 11 game to see if the player 1 and 3 light up and they do. I swapped data cables between games and there are no changes. I checked the obvious things. No open solder joints anywhere on MPU or Display board, no acid damage and no burned chips or connectors. Power supplies are displaying correct voltage.
Any suggestions on what to test next?