I had somewhat the same problem. Good picture with antenna or DVD, fuzzy when on cable while others had clear picture. Booster on/off, no difference. Except if you pulled on upper right hand corner of TV, then clear picture. Dealer has supposedly fixed, but RV has been in storage ever since so acid test will be when we camp again and have cable hookup. By the way, anyone know how to get flat screen off the wall in Georgetown 335DS? I assume it was just a loose connection but wasn't going to mess with it as long as it was under warranty.