This model only has one HD input---it has two sets of component inputs on the back and one is marked 480/1080----in the menu it will be the DTV input.
Check to make sure you are not connected to the other component input.
Let me know what happens and let me know exactly where you are connected and what are using for signal.
If this told you something you did not know rate this solution as very helpful as I do this here for free.
SD TECH
TWO POSSIBLE REASONS:
Source for HD signal bad or cables used. I presume you are using a box of some kind for this.
If it goes to the DTV input the second choice would be to try hard reset of the set--usually if this is needed set will not go to certain inputs.
Set has 3 hidden menus, Tech adjust, Convergence, and OPTION MENU.
All are accessed with 4 digit number via the original remote. I know the codes and can tell them to you.
Option menu resets tv to condition it was when new in the box.
I suspect problem is not set but with source of signal to set.
SD TECH
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Verified input set to DTV. Still only standard channels work, not HD
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