• There is a faint horizontal bar running the entire width of the screen almost halfway from the bottom
• Width of bar is approximately 15 mm
• Bar appears on multiple inputs (component from DirecTv HD box and composite from DVD player)
• Inside this bar the picture seems to be slightly lighter than is should be

This can be solved with the latest software, here available on this site.

You can use your update assistant to guide you.

Press MENU on the remote control.
Press Right.
Press Down to select 'Software update' and press right
Press Right to select 'Update assistant' and press right again
Press OK to activate the 'Update assistant', how will guide you thru the software update.