To adjust brightness, follow these steps:
Make sure the TV is on and set to the correct input to view the System menu
On the remote, press SYSTEM
Press the RIGHT arrow to highlight the "Media centre" icon
Press ENTER. "Display brightness" will be highlighted
Press ENTER. The current brightness setting will be highlighted
Press the UP arrow or DOWN arrow to change the brightness setting. The brightness setting will be between 1 and 4
Press the RIGHT arrow to highlight the "Media centre" icon
Press ENTER to confirm and then EXIT to leave the menu