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Main board fault. Shorted component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It sounds to be a panel fault. Contact any service technician, and make it sure. If you wish to get some screen-shots about faulty displays http://electronicshelponline.blogspot.com/ check this link. Pull up previous posts there, either by its left side bar,
or view it in Timslide option.
It sounds that, the memory IC to your TV has damaged. This IC can be located very near to main system control IC. A very small one, with 8 solder terminals. Even though it is very small, function of it while the TV works is great. The work is a semi-skilled one, and you must have some knowledge in electronics to proceed.
Sound like the TV is in protection mode. This happens when a part goes bad inside. the TV turns OFF to protect the other parts from being damaged.
Most commonly it's a power supply related issue. A bad capacitor or transformer on the power supply board is to blame.
For a do-it-yourself fixer with electronic experience, a Service Manual is the best for trouble shooting the problem down to the bad part. Normally, you can find it over the internet for less than $20.
Try Shining a bright light at the screen. can you see any images on the screen? If you can, then the backlight on the tv has gone, and can be replaced.
If you cant then it may be a fault with the inverror (power) board on the TV