In my area, Comcast just completed removing the analog channels from their system. I rescanned all the channels, the TV stopped at 55%. I tried scanning only the digital channels it stops at 10%, without finding any channels.
I tried disconnecting the cable input, then it scans all the way through without stopping. Hook the cable back up, same results as the first scan.
Now the bad part, before the rescan I was receiving the clear QAM channels, now I cannot receive them even by manually entering them.
I did a reset from the remote, disconnected AC power for a few hours, still no QAM.
It acts like it knows the QAM signals are there, because that is what makes it hang during the scan.