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All Hi Def channels are not Hi Def all the time. Some also broadcast in a different format(not 1080I), which results in a different size picture. Since you are on cable, you have a Hi Def box. If you are seeing black pixels, or freeze frames, you have a bad signal. Make sure all connections are tight on the coax cables. You may have a bad Hi Def box from the cable company. Connect the cable tv line straight to your tv bypassing the box, and see what the picture looks like. I have a Wega 51" and it took some playing around to get the picture looking good on the regular channels. By the way, usually the first 80 channels on your digital box are not digital. The cable company keeps that little secret to themselves
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