WG 4901 monitor help..picture not staying locked

knight rider

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I have a wg 4901 monitor in my cheyenne cabinet. Now something happened to the main game pcb it smoked on me. After replacing the main pcb with a known good working one,
Ever since then, everytime I turn the game on the screen always moves vertically, its never in the same spot everytime I turn it on.I tried a known good working board that does the same thing to it in my cabinet but not his cabinet.I never had this problem before my original pcb smoked, the picture stayed locked in. I have to adjust it everytime I turn it on.

Anybody have any ideas what took a crap on me that controls the screen not to remember its place or stay locked in????

thanks john
 
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