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I'm not sure why you cant make adjustments when in HD mode. I have been able to make adjustments when either in OTA (Over the air) TV mode or with my Bluray Player on HDMI 1. Each input is individually adjustable. I use the remote and press MENU to get the the picture adjustments by highlighting the selecttion to change on the remote and using the UP,DOWN, LEFT, RIGHT arrows in the center of the remote to make the changes. Hopefully this helps. I make all adjustments with the remote.
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