Asteroids Issue - Game on, 2 lines in top right

TheMooseMan

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Hey Everyone,
a customer of mine has an asteroids cab that coins up and sounds like it plays fine, but all you can see on the display are two 3inch or so lines, that seem to alternate in the top right of the monitor, one horizontal, and one vertical.

Reading around, it seems like it may some 2406 roms or something like that. (i can't remember the exact page I saw it on) Attached are a few pics of what the game looks like fired up.
Any help is appreciated.
 

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Easy way to rule out the monitor is to hook it up to an o-scope if you have one or have access to one. Could just be some game board booboo.
 
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