TECH HELP: Cinematronics Cinemat System

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Have what i believe may be an almost working dedicated Cinematronics
Cinemat game system with World Series. I've had this for 2 years and
can't get a useable image on the screen. All i get is checker
board-like jibberish in black and white, and sometimes it has a black
bar down the middle of the screen along with the jibberish patterns. No
color rastor. And this isn't with just ONE board, i've tries about 5
compatible boards and they all produce almost the same kind of image. I
should mention that the +5 is drawn from a switcher, and the rest of
the power is drawn from the original supply (the Dragon's Lair type).
Also the monitor is a WG 4900 with the 6pin connector next to the 3 pin
connector. and there are two 3 pin connectors that go to one of these
marked M1 and M2. The game does power and something does show up on the
screen, but nothing ledgible or in color. I also doubt if all of these
boards are bad, i strongly believe it's the game. Any one that hase one
of these or knows about them, your assistance would be greatly
appreciated. Thanks.