I have had this TV since January 2011. Worked perfectly from then all the way up to (but not including) today. It was on last night and working without a problem. I turn it on today and it turns off shortly after running. The blue light fades and changes to blinking red. The blink is steady and doesn't stop, as far as I know (I let it blink about 20 times before turning it off). Pressing the power button on the remote or the TV when the light is blinking turns the TV back on. I timed how long it is off. 35 seconds elapse from the time I press the power button to the time the TV turns off. During those 35 seconds, the TV appears to be working absolutely perfectly. The picture and sound are great. I tested it with my Xbox 360 on and I also tested it with just the screen saver. 35 seconds of power each time. I have an electronic duster that I aimed into the vents to knock any potential dust loose, but this did not fix it. I have not tried removing the back panel and dusting. Thank you in advance for the help.
The TV is going into protection mode. Could be a problem with moisture. Can you try warming up the rear with a hair drier? Ensure that you do not apply too much heat to avoid damage to plastic parts. If you can remove the back cover (after unplugging the power outlet and switching off the TV), try doing in on the entire PCB, if you suspect moisture is the problem. Please do not touch anything in the board by bare hand as there would be high voltage charge in capacitors even after switch off. If it does not work, this might need attention of a qualified service technician
Now there is a challange.
My LG has not shown this behaviour yet. Do you still have the DVD disk that came with the TV.
If you do you will get your answer there I presume.
Make sure that you are using the correct input.
kollagunn
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