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The power supply failed on your LCD and will need to be replace or repair. In about 95% of the time the power supply failed due to defective capacitors, shorted diodes or open resistors.
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what do you have connected? you can try withe basics. if you can try a rg-6 cable into the f connector. then try a dvd on video 1 and change the input to input 1 and see. if nothing else try a hard reboot thats unpluging the tv for about 2 min. then reconnect.