Samsung LN19D450G1DXZA - Manual (Page 186)

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English
Issues Solutions and Explanations
The TV turns off
automatically.
●
Ensure the Sleep Timer is set to Off in the System
menu.
●
If your PC is connected to the TV, check your PC power
settings.
●
Make sure the AC power cord is plugged in securely to
the wall outlet and the TV.
●
When you are watching TV programs from an antenna,
the TV will turn off after 10 - 15 minutes if there is no
signal.