Unplug it hold down the Channel Down button and the Volume Up button unplug it for 10 seconds then plug it back in and continue holding them down for another 10 seconds then release. I had the same issue and this fixed it now I have another though *~*
Sharp 46 aquos model LC46E77UN tv turned off power button just flashes on and off tried unplugging and waited an hour and replugged same conclusion power light just flashes I have same problem and just bought the tv so I called and they said that the tv needs servicing
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