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You may not have the resolution set to hd even though you are on the channel. Confirm that you are using hd cable and your set is displaying 720p or greater. This will sometimes pop up on the screen when you tune to a hd channel. it sounds like you are on 480 i or p. good luck
do you subscribe to the HD, if you do you will have to activate it through the menu button, go into the aspect ratio and set it on 720p or 1080i press OK the it will run a test...press the "up" arrow and then press OK.
Now on Uverse you can only get HD through the HDMI or the Component,red green blue, outputs.
switch the HDMI cable to another HDMI port (if available). or use and AVI/COMPONENT to make sure the device (HOME THEATHER) is working fine. Try also another HDMI cable or hook another device into it to see how it works. If you determine the HDMI port in not working properly, then your Mainboard is damaged and need to be replaced, try EBAY for a general
picture of prices but you will need your product code wich is located
in the back of the TV next to serial number.