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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.
Ok not sure if this is your problem, BUT, I have done this before! If you hit the SLEEP button on your TV's Remote control you may be setting the SLEEP TIMER on your TV. It is made so you can watch a show and fall asleep on your couch and the TV will shut off after a specified time. On mine it is anywhere from 30 minutes to 3 HOURS! My remote says the word SLEEP over the timer button. not sure on yours
Hope that solves the problem, just hit the button until the word "OFF" shows on your screen.
Before going to set the timer, you have to set the current time. Set it according to the manual with you. If the timer function work properly, there must be an uninerrupted power supply also. If the power goes off, the set time will also get resetted, and improper function will occur.
After setting the present time, set the "on" time and "Off" time. The TV will switch on at that time you set, and will switch off automatically after the end time. OK.
firstly check your sleeping timer set ups. if that is okey, then check the following
the power supply components eg
power transistor on the power supply lekage
zener diodes, power diodes of the bridge rectifier.
in short the supply is drowing to much current, hence semiconductors are heating up and reach a cutoff point, and saturates
just checked a similar sets owners manual...the sleep timer on this model is located in the menu---setup,,this menu prompt has language,SLEEP,menu trans,menu timeout ,and default setting....if you don't see the SLEEP mode in setup--you probably don't have it!...hope that helps