My suggestion is to use the warranty that came with the tv and get a new one. Most of the time things like that will cost you more to figure out how to fix it and get people to help you try and fix it, so again return it and get a new one, your better off.
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Tries tv unplug,replug it back about an hour later.The tv,now should reset itself back to factory setting.The tv should work now,not than the power supply board is dying,not giving the right voltage to the rest of the tv anymore.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Time to get a new TV. I have similar problem. In my case, the set turns off, LED blinking green for about a minute or 2, then the set will turn on by itself. Something the LED started to blink yellow after blinking green and then shuts off. I can turn it back on. This happens 3 or 4 times in an hour. After that, the TV stays on for as many hours as I want until I shut it off.
And then the problem repeats everytime I turn it on from a cold start.
I have my eyes on the 50 inch Plasma from Panasonic. Bestbuy has one for 999.99.
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.