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Replace the inverter board very easy repair takes just a few minutes to remove the old board and install the new. You can get the inverter board from www.tvrepairworld.com they will also assist with installtion instructions for free if you need them.
I have the same TV and what is happing is the TV has 2 recievers in it to allow the PIP, So you have a power pack gone on 1 reciever the other is working, Your set has 2 power packs,1 for each receiver.
I had both of mine go, 150$ a piece to have fixed, good luck.
Look at the venting grills, you should see whit lights inside the set. If not, the backlight inverter board may have gone out or the power supply supplying the power to the inverter board may have gone out. Those are the two places to look first. It may have bad capacitors in the power supply. http://en.wikipedia.org/wiki/Capacitor_plague
If the screen is black and you have sound then lightly press and shine a strong flashlight against the screen. If you see an image around the edge of the flashlight, an image is being 'displayed'. The problem is probably in the Inverter/CCFT or the power going to the Inverter.
Try a "hard restart" , which simply means unplugging the power cord of the TV, then replugging it after 4 hours have passed. This technique helps to reprogram the electronics of the TV.
Hope this suggestion works for you.
try putting it in recovery mode what you have 2 do is is hold down the play button while you turn on your mp3, as soon as you see thee logo release the play button and then choose the "reload os/ firmware" then follow instructions