AR-5618
Do a hard reset to this set and check. To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset.
If it do not help you; the fault is with its main board. Contact any service technician; or the authorized service centre.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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