Usually the result of a weak or interruption of the signal. If it occurs on all channels, look into getting an inline amplifier. If you have several splitters going to different tv's or a multiple splitter, the signal is degraded each time the signal is split. You can test this be temporarily making a direct link to the TV from the cable source. If it clears up, then you know you need to amplify the signal.
The signal coming into the cable box could be weak. I know it is a pain to do this, but to test whether the TV itself is having problems or if the signal (or cable box) is bad, you will have to check the TV with another box in the house that works fine on another TV. To eliminate the TV as being the problem, move it to another room and connect it. If the TV works fine there, then swap out the cable box. If the problem moves with the cable box, then get the cable provider to replace the box... however, if the problem does not move, then it is in the wiring or the signal is too weak. There has to be a splitter somewhere that splits the signal to all the different boxes in the house. The splitter itself could be going bad or you just need to amplify the signal from the splitter (usually about $20 at your local Wal-Mart or Target).
Replace the TV
If you have too many connections via splitters in your house, the signal is degraded to the point where the cable box is dropping frames, thereby causing pixelation. You'll need to pick up a good quality signal amplifier to amplify the signal before it goes through the first splitter. The best solution is to buy a splitter/amplifier combo. A good one will run about $60.00 and will be powered via a power supply.
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TV has its own dedicated cable box. Have swapped out AV cable from TV to Box. Occurs on all channels, but especially more prominent in center of screen
TV has its own dedicated cable box. Have swapped out AV cable from TV to Box. Occurs on all channels, but especially more prominent in center of screen
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