Just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This must make the TV to a hard reset. If no other problems to the set's internal circuit boards, it should work properly. If it does not help you, make sure that the main board to this TV is faulty. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
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