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Please check that the sleep timer did not somehow get set. If it's not the sleep timer, check if the panel stays ON longer after it's been off for awhile to cool down. Possibly a heat problem with the power supply or main board.
I am sharing four cases in which your tv either turns itself off or appears to turn itself off.
TV appears to be off
You using your tv as a monitor or your pc is in sleeping mode.
Your cable or satellite Box is not outputting a signal.
TV turns iteself off
The sleep timer is set.
The off timer is set.
Your tv appears to be off:
If you are using the tv as a monitorIf you are using tv as a monitor and the stand-by light only
blinks for a few seconds when you press the power button,your pc is in the sleeping mode. To take your pc out of sleep,press a key from your key board or move the mouse.Tv turns on.
If you are using TV with a cable or satellite Box
If you have a cable or satellite Box your Tv may appear be off because the cable or satellite Box is not outputting a signal.Press the guide or info button on the cable or satellite Box remote control.
if the screen displays info or guide data,the problem is caused by the Box,you must call your cable provider.
if screen does not display info data,change the source on your TV.
Just look in the menu options for "Sleep mode" and set it to OFF! If that doesn't work, try unplugging the television for an hour or set. That usually resets it to the factory default setting. You might be able to reset it by looking in the menu options and select "Factory Reset" and that should reset the Sleep mode. Hope that helps!!
Check this, for how long the TV is on? 30 min., 45min, 1 hour? because maybe you have accidentally programmed the SLEEP control. If so, go to the set up options or menu with the remote control and check the status of the sleep power off time. Or maybe the TV has the otion to power off automaticly set the same way that is the alarm turn on.