Not sure if this might apply to your situation, but I just posted this info for another user :
"If you have to convert your HDMI to DVI, use an adapter, but remember that DVI only carries video, no audio, so you'll have to add L/R audio cables. Look for a DVI setting in your TV and turn it ON. Some TVs don't have a specific DVI "setting" but instruct you to use a specific HDMI input for DVI (mine says use HDMI-2), so just use the HDMI-DVI input the manual specifies. If you've got a 1366x768 (720p) TV that shows a dark pic, it might also produce a brighter pic. In fact, even if you're using pure HDMI, try turning the TV's DVI setting ON or use the TV-manual-specified HDMI-DVI input just to see if PQ is improved.
If using a DVI setting or HDMI-DVI input on your TV, set this DVDR's HDMI Format to RGB and NOT YCbCr, cuz RGB is DVI's native format.
If your HDTV also has a setting for "Overscan," try setting it OFF to see if it increases your PQ. Your TV's Overscan function can also affect pic size for JPG/JPEG pics. When using HDMI or Component input on your TV, and you notice poor quality or clipping of JPG/JPEGs (5-10%) from all sides, it could be caused by your TV's Overscan function. You should look for "Overscan" in your TV menus and turn it OFF to see if it helps."