We have a 42" Sharp Aquos. We are having problems with two of the HD channels. On one channel (NBC), the screen continuously blacks out when in HD. When it is the local broadcast that is not in HD, the picture is ok but has lines across the screen, but in the full HD, it continuously blacks out but the audio is still there. On the other channel (CBS), we get lines in both modes, but doesn't black out as much. Does anyone else have this problem? We had the cable company come out and got a new digital cable box, but after trying everything, they said it had to be the TV.
Saying that the problem is with your TV doesn't make any sense since your TV is fed from the cable box. Your TV doesn't know one channel from the next. If it had a problem it would effect all channels. You may not have enough signal to the INPUT of your cable box due to a problem on the pole or at your house or both. Insufficient signal can cause some digital channels to not get decoded properly by the cable box. The lower channels will show noise symptoms such as what you describe but they won't crap out altogether like the digital ones. Have a cable tech come out and measure the signals. Do you have splitters in line with the cable anywhere? If there's any way to beef up the amount of signal getting to the cable box try it.
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