Press the 'MENU' button,and press the cursor up/down to select FEATURES and press cursor right.
Press the cursor up/down to select TIMER and press cursor right to select SLEEP.
Press the cursor left/right to select the number of minutes (15, 30, 45, 60, 90, etc.) that you would like to set if for. With the desired time set, the timer begins to countdown from the number of minutes selected and turn the television to standby when the timer reaches zero.