I do not have hd service but do have a cable box that I have connected to the cable jack on the back of the TV. It was working fine but now the picture is fuzzy. I have tried doing a channel scan on both Cable and Antenna and it picks up the digital cable channel but the picture is fuzzy.
Ur standard DTV signal picture ok?Not than ur Main Tuner signal board is dead.Must replaced the Tuner signal board.
Call your cable company as there might be a problem with the drop line or aerial coming into your house. now another thing is if you have a signal splitter( ex: 2-way, 3-way, 4-way) before the cable box, that could be degrading the signal as each input may drop the signal significantly. remeber, don't use too many splitters as they will make the signal faded/fuzzy. also, make sure all the connectors are clean and are not badly bent or the ends frayed. If you can see wire insulation from the cable line then it's no good.
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