Samsung UN50ES6100 E-Manual page 608

If your Samsung TV appears to turn off
by itself, there may be an issue with
either your Timer settings or your Eco
friendly No Signal Power Off feature.
First make sure Sleep Timer is not
accidentally set. The Sleep Timer turns
off the TV automatically after a certain
period of time has passed.
Œ
Sleep
Sleep Timer
If the Sleep Timer is not activated, you
Timer: System
→ →
Time