First, make sure you don't have an actual electronic problem. Otherwise, you will "tweak", when you should not. Be carefull what you adjust, & write it down. Dani.
With TV powered ON press: [DISPLAY] and [VIDEO STATUS] on the remote at the same time.
-or- Press the [SLEEP TIMER] key and set the SLEEP TIMER for "0" MIN. While the SLEEP TIMER information is still on screen, press the [DISPLAY] key and [VIDEO STATUS] key of the remote control unit at the same time to enter the SERVICE MENU.
Exit the service menu by twice pressing the [EXIT] key on the remote.