If you can find the antenna booster, normally in a closet- Often the coax connections on the back are loose, especially if only one TV is affected. Booster has a green light when on. (for Over the Air reception) It should be off when using cable input. Somewhere (mine is under a bed) the cables do go to a splitter, those connections also need to be checked.
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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