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Unplug the television. Check to see if the plugs are polarized (one bigger than the other). Sounds like if the plug was plugged in the wrong way could cause what we call a hot chassis. The tv is not properly grounded, it appears to be a grounding issue.
try setting the tv to channel 3 or 4. if that does not work, try finding a "input" or "source" or video" button on the remote and cycle thru them, this should get you back up and running. remember to have the cable box turned on during this so youll see when it comes back on.
i hve the same tv and the same problem. heres the fix; you must take off the back cover so you have the back of the lcd exposed. its about 30 r so screws to get it all off. once you have the back panal off look at the side where the power button channel button and volume ect. button are. follow the wire thats connected to that, to the motherboard. simply unplug this wire from the mother board and use your remote control to change channels and power on off the unit from now on.
Unplug TV set from the outlet, wait 30 seconds, plug it back in, select right input with your remote if you using cable box or Punch the channel that you want to watch if you have cable service connected directly to the TV.
I have one in my shop with the same problem. Power is the only function that works. I repaired the power supply six monts ago. Now it looks like a bad digital processor board which is non-repairable. I can't believe what's happened to the tv business. Absolutely disgusting!