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Hello, There's lots of things that can cause this- the most common being a faulty power supply board.
However bad sustain boards, shorted driver board or bad mainboard can also cause this problem.
To narrow it down further, we need to know a few more things-
1) Was the TV ever hard to power up or shut itself off in the past?
2) Did this occur after a storm or power outage?
3) Does the power light start blinking after it shuts down?
4) Do you have a multi-meter and have you ever tested voltages before?
Please elaborate and we can proceed.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 3 times, and please let me know what happens.
You're welcome. Let me know if the screen lights up, if the audio turn on chimes- or if the power light starts blinking after it clicks off please.
Okay. The power supply jumps out at me as being the cause of this. That chime should be coming from the TV's speakers. You're saying the set essentially responds to the power button- clicks on- but no light to the screen, then it clicks back off- is this correct?
Are you still with me?
Hello there and welcome to Just Answer. My name is ***** ***** another expert - and I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.
Do you have a multimeter so that we can measure some voltages?Let me know.
Ok, I need to grab the manual and come up with a testing sequence for you. Give me 15 mins if you would please.
If you haven't done so already, remove the back from the TV so that we can test some things.Thanks.
First thing would be to do a visual inspection of the chips on the Y buffer boards. I have indicated those >>>HERE<<<Take a close look for any that may be cracked or exploded. Sometimes, a small pinhole will indicate that the chip has failed.
I'm sorry, I have been unable to complete this request. I am going to opt out of this question which will allow other experts to chime in.
Hello my name is***** do not rate until we are finished. I look forward to assisting and am very sorry to hear that you are having this problem. When you turn it on and hear the click does the power light flash at all while it is clicking? I know you were already asked if it was blinking before it turned off. Where on the TV does the click sound like it is coming from if you listen closely?
5 flashes means there is a power issue, have you checked the power supply?
The easiest way to start is to check the caps and resistors with a multi meter. They will say the voltages on them. If you are not sure how to do that use this video:
The easiest and best way is to remove the board to test it from the bottom. Doing it without removing it can give you improper readings.
You do not need to remove the components just the board itself and test from their connections on the bottom of the board.
You're welcome, let me know the results when you can. If you are lucky you will be able to just replace one of the caps. If not you may need to replace the entire power supply.