Had a very similar problem with mine - not sure if this will help or not, but it seems to be doing the trick (channels scanning as I type).
I unplugged the tv for about an hour. I unplugged the cable, and all the components. Then I turned the tv on, and was able to get to the menu screen. Previously, I couldn't change channels or even power off from the buttons on the side of the unit either...
Once there, I plugged the coaxial cable directly into the side of the set, then ran the auto-scan.
I know it's not a techincal answer, and a bit strange, but as I mentioned, it seems to be working for my issue.
Good luck!
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