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2609 Display unstable, jumping up and down... original Inty boards

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Hi. Does anyone have any advice on how to fix the screen jumping that seems to be common on a few of my original Inty 2609 PCB boards? I get it on my Sears unit, Tandyvision and one of my Mattel units as well. Works fine for 10 min maybe 15, then the display start jumping up and down.


It's not my late model Panasonic TV as it doesn't happen on every unit I own... just a few.





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