I have the exact same problem. It may be the tuner board is bad. I did some research and it seems like this tv is junk. I saw a link that said call Vizio and they are aware of all it's problems and are willing to give a new tv free of charge. I called and they knew nothing about it, but did offer to fix it out of warranty for $285 all problems fixed out the door. Also, TV locks up on RGB input and can't switch inputs until I hooked a computer to the RGB input, then I was able to select a different input.
\012Please post if you found a solution to the DTV issue..
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