I have a Polaroid 40" LCD TV about a year old. I use it only with HD antena (No cable or dish). I used to get all the free local channels HD broadcasts. However, yesterday the TV lost all its channel. It keeps on flashing message that scan for channels, and when I scan no channels are found.

I did connect it with analog antena, and many of the channels do show up (not in HD mode).

Any help will be appreciated... Thanks in advance

All is well. Seems that I was using wrong setting while searching for channels.