Have TV Questions? Ask a TV Technician
Hello and sorry you're having problems.
We often see these sets develop faults prematurely, and in most cases it requires replacement of a component (the Power Supply Board being the most common).
However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 2 times, and please let me know what happens.
Unfortunately that is the only user level correction for this. The TV has a hardware failure internally that is causing the issue. There are no pushbutton fixes. If you're looking to repair the set yourself, you will need a multi-meter and to be able to test the 12 volt feed from the power supply board that drives the LCD controller to see if the power board or LCD controller is at fault. Let me know if you're considering a DIY repair and also what tools/experience you have.
Alternatively, if this is not something you're comfortable with then a shop will generally charge $250 parts and labor for this repair and can be located at the following link:
Other than that, I'm sorry for the bad news and wish there were a quick fix.
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I can't change the facts. I asked if you have a multi meter and are looking to repair this yourself, that's the only extra info I can offer you.
I'll opt out at this point. Good luck.