Mrs pacman help PLEASE!!

Rome

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Just picked up this mrs pacman, and it's great, plays fine, it has a little tiny issue, which isn't really a bad issue i don't think, but it's kind of annoying.. I have perfect picture/color and gameplay, just on the black screen areas i have thses like white dots/ dot lines scrolling up the screen.. i posted a video to show the problem.. I can't seem to narrow down what is causing it.. i've checked the neck board, fuses, all connectors/chips are secure, ?? i'm clueless.. seems like interference of some sort, but i can't nail it down..

http://www.youtube.com/watch?feature=player_embedded&v=8l4g0u0iq7I
 
Looks like you have the humbar as well... Start with the easy stuff... clean the edge connector. Put new fuses / fuseholders in it... You may have some crud buildup around the legs of your roms too.
 
Check the power cord and see if the ground wire is still there, where it plugs into the wall. You might also look inside to see if that same power cord goes to the line filter inside the cab, it should be a small silver box that that power cord goes to. While you are there look for any wires going near the monitor pcb and any other wires that could be picking up some noise. The Isolation transformer might be getting some kind of noise from some where else (from the output to the monitor chassis (pcb)).
 
Turn dip 8 on. Does the interference freeze?

Additionally, is the filter board there?
 
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