Samsung PN50A550S1FXZA User Manual page 55

Settin theSlee Timer
The sleep timer automatically shuts off the TV after a preset time (30, 60, 90,
120, 150 and 180 minutes).
1 Press the MENU button to display the menu.
Press the A or _' button to select Setup, then press the ENTER button.
Press the A or _' button to select Time, then press the ENTER button.
2 Press the A or _' button to select Sleep Timer, then press the ENTER button.
Press the A or _' button to select the minute, then press the ENTER button.
To cancel the set sleep timer:
Press the A or _' button to select Off, then press the ENTER button.
Press the EXiT button to exit.