I have a Sylvania 6419TG and have an RCA indoor antenna hooked up that receives HDTV /VHF/UHF and FM signals. When I do a channel search it receives nothing. Just blurry fuzzy picture. Why is that? I get the same with my Phillips antenna. Both antennas work with my other TV. Can't get it to work with the Sylvania though. Any ideas would be appreciated.