may have better luck posting in the pinball section.
out of dumb curiosity, does it do this upon power-up too? from what I read about Data East pinball machines is that the version # screen that comes up when you turn the machine on is built-in the display itself.
if all the lines come up in that, then you're probably looking at a signal cable/communication problem between the game board and the display.
beyond that, I don't know what to tell you, I don't muck with those at all. good luck though!