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You may have a loose internal connection in the box or the TV connection points. But total tight integrity of cables is very important for a good picture without interference. Try another screw-on cable, just long enough to reach. I've found a difference in the quality of some cables and their connectors. Also try tightening the connector with a wrench, just snug, tighter than finger tight but don't kill it. Sometimes tightening makes bad things go away.
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Reece
Perfection is hard to reach with a screwdriver.
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