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Switch off TV, switch off power, remove plug and wait for 48 hours and retry. If problem persists, I suggest it is better to refer it to a qualified service technician, since the back cover has to be opened for investigation/rectification.
If the power light stays green then the current absorbed by the different boards appear to be normal. If that is the case then most likely you have a bad contact in the data cables or in the mainboard.
You will need to open the tv, inspect for damage and reseat all the components then (if that doesn't fixes it, you will need to extract the mainboard and check the soldering on the board and the status of the processor.
I just started having this problem myself.
Try unplugging the TV for 5 minutes, plug it back in and turn it on. This worked for me and so far it's still working.
Someone said this is a "cold reset" and works for a number of problems.