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If your TV was "Built" prior to November 2006 it does Not have a Digital tuner and you need a converter box (if you are using an off-air antenna) Hope this helps
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You might need to adjust your antenna and reprogram your channels. It helps to reprogram every once in a while anyway, because new channels are always coming out.
HD would include a search in a digital mode.Also, there may be another RF connection marked HD or Digital connection, use that RF connector. Thanks for asking me.
You may not have the resolution set to hd even though you are on the channel. Confirm that you are using hd cable and your set is displaying 720p or greater. This will sometimes pop up on the screen when you tune to a hd channel. it sounds like you are on 480 i or p. good luck
Both the TV and the Cable box have Aspect(height/width) settings. You must confirme the setting on the cable box and then do the TV.
1. Set TV to Native, this should show image exactly as the cable box sends it.
2. change Aspect settings on the cable box until you get one that works
3. if you get a good one, then your OK. You will just need to find a setting between the 2 devices that work for you. Also, these settings may change automatically for the TV or cable box based on the channel
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.
what is the model, and are you on cable or antenna?
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