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Re: TV turns off by itself.
Ok cowsad! you have defective tact switch relace all tact switches! the tact switch is have only resistance if you press it, but now ithink your switches is now have smal resistance thats why your tv is on and off automatically.
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Check the tv menu settings...go to where you set the date and time etc... usually in the general section..
Look for timer or timers...turn off sleep timer, turn off power on timer and turn off power off timer...cheers
Put your hand on the back of your TV to check for overheating, if your set keeps switching itself off without warning.
Many TV sets come equipped with a safety feature that switches the power off if the set gets too warm.
Check the cooling vents located at the rear of your unit. Vents can collect dust and dirt, resulting in the fans becoming blocked and failing to work properly.
Remove dirt from the vents with a damp, clean cloth. Ensure the air conditioning is kept at adequate levels in the room where your TV is located. Keep the drapes shut on hot, sunny days to keep the room cooler.
Check the sleep-timer function on your TV if it keeps turning off. A sleep-timer is used to turn a television set off after a certain period of time has elapsed. If the sleep-timer is not turned off, your television will continue to turn itself off after a certain period of time.
If the problem persists,then a heat sink has gone bad.
The on/off button simply toggles a low voltage circuit that powers your tv. If it is dusty, it may complete the electrical circuit and send a false signal.
Take a can of compressed air, open the back and clean the dust off the circuit boards.
Is there a dark patch when you see the picture, easiest way to check is on the tv tuner with no cable attached, this way you have a grey static screen, if there is a darkness across the screen when it lights for that breif moment, then it may have a broken backlight tube. Had the same problem with my 32" LG.
More than not if it is a loud noise shortly after you turn the set on, the color wheel is bad. The color wheel is not available by itself and requires the complete light engine to be replaced. The part number for the light engine is 75002250. I would suggest having a technician replace this for you if this is the case. Please take a moment to rate my answer. Thanks...