This sounds like it might be a main board issue. Depending on the television brand there are different replacements you can get at different prices. I would try unplugging the tv from the wall first then try plugging it back in while holding channel up/volume up on the tv as you are plugging it back into the wall. If this doesn't change anything it is most likely a problem with your main board.
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Hi, please call a specialist in that for assistance. As of now and future: Follow what everyone says: "Turn off the modem and TV during a lightning storm".
Is it repairable, well, this question can be answered only after opening the back cover and evaluating the damage. From you side, please connect the TV to a different power outlet where other similar devices are working and see. Then try changing the input device to something that sure works. If it does not work even then, this may need attention by a qualified service technician.
Sounds like you are missing your 5VDC standby voltage from the power supply. You either have a blown fuse or a defective power supply. Did this happen out of the blue or after a T-storm???
Unplug from the wall and hit the power button on the tv. The light may come on dim then fade out or you hear a click. This means it has built in surge protection. Plug it back into the wall and you should be good to go if nothing burnt up.
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