Samsung PN51F5300BFXZA - Manual (Page 72)

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Using the Sleep Timer
O MENU m → System → Time → Sleep Timer → ENTER E
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Sleep Timer t: Automatically shuts off the TV after a preset period of
time. (30, 60, 90, 120, 150, or 180 minutes).
N Use the u/d buttons to select a period of time, and then press
ENTERE. To cancel the
Sleep Timer , select Off .