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Most likely a power supply component has aged and thus changed value and/or
failed. Take it to a reputable repair person.
The backlight inverter board may have gone out, or the power supply for the inverter may have gone out. If it is two years old, you should look at the power supply first for bad capacitors. http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find. What is themodel number anyway?
well it looks to me u need a new tv....all the details u give are pointing that ur picture tube is gone.....but call LG help and costumer line and ask them......u may get away from it to get a new tv make sure when u get a new plasma to extend ur warren tie to a max o 3 to 5 years and if this would happend u get it repaires for free.......cost for a new screen app 1000 to 1500 dollars