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When you program your HD converter, it searches for all available channels in your area and you may find, as I have, channels you never knew existed. As for the audio problem, some of the found channels may be so weak that all you get is the picture - no sound. You can delete the problem channels but they are likely to pop up again on your next programming run.
Usually this happens to my set when I am in HD cable channel mode after being on a non-digital ANALOG channel.
I basically reset the TV by changing to a DIGITAL cable channel -- stay on that channel for ten-twenty seconds -- then I switch back DIRECTLY to a HD channel (key in channel number directly on remote).
TV works fine -- seems to be a glitch when the TV changes modes from Analog to HD
to get best picture and sound you need to use HDMI connection. This is normally if you have a HD cable box. If you don't have a HD box, use the coax connection directly from the cable line. On your TV, hit the menu button, use the arrow up/down to select manual channel search, select cable and hit enter. this will scan all the digital and analog channels.
This TV is not able to understand digital channels because its tuner is not able to find that band, it works only in analog channels. To be able to get HD channels is needed a decoder box that has digital tuner build in. for a tv to understand HD Channels with analog tuner is to us to try to speak at the same time different languages.
This set does not support 480I in the DTV mode, only 480P and 1080I is supported.
Try setting the analog setting in the cable box to 480p and that should take care of watching the set in DTV. Most cable boxes have a setting for format changes in the customer menu, depending on the type of box. If you are able to change the format, then the other inputs will not work since they need a 480I signal, as well as VCRs.
Another setup could be to use the S-Video cable or Video input jacks to get a better picture in 480I instead of using the cable input. However, when changing from HD to Analog, you will have to change to the correct input on the set as well.
Hope this helps.