Samsung PN51E6500EFXZA - Manual (Page 171)

N Available only when Clock Mode
is set to Manual .
●
Sleep Timer
Automatically shuts off the TV after a
preset period of time. (30, 60, 90, 120,
150, or 180 minutes).
N Select a period of time using your
remote. To cancel the Sleep Timer ,
select Off .
●
On Timer
Set On Timer so that your TV turns on