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The board where the power button is located (same board for the other buttons too) is probably bad. It's all one board, which tells the power board to come on. If this happened after a power surge, and you're not using a surge protector, multiple boards can be bad. (You can't just plug these fragile TV and Blu-Ray players into the wall outlet. Eventually a surge will destroy them). Ps... A lot of people are suddenly making this same complaint with Vizio TV's.
Do you have your television plugged into a surge protector? If not, your television might have blown a fuze. You will have to take your tv down unscrew all the back plate screws and check the fuze. Possibly your remote is dead. Try pushing the power button directly on the tv and see if that works
Tv turn on now,does it have a flashes of picture only a few second than dies and than have only sound left?Yes,than the tv 2 long LCD inverter boards are dead.These 2 long LCD inverter boards are one to the left one to the right both must be replace.The 2 long LCD inverter boards job are to help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 LCD inverter boards for the replacement.
Tv now turn on,tv have power LED light indicator flashes?Tries tv unplug,replug it back like an hour later,the tv now,should resetting itself back to the factory setting.The tv should work now.Not,than the power supply board is dead.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board,will get picture back.Tries these websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.
on the back of the TV where the power cord plugs into the back of the tv there is a small black on/off switch- it's not as obvious as you would think.... but that was turned off. Not sure how that happened since the back of the Tv was never touched when it went dead- but I unplugged the cord from the back of the tv and from the outlet and reset that switch and it worked.