There is some problem with its audio output section circuit. It is difficult to predict. Your set needs a through check up. Contact any experienced service technician. It will be the best. This is not a user repairable fault. If you wish to get some details; check the site linked here. Pull up older posts. https://electronicshelponline.blogspot.com/ , faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Screen-shots to defective LCD and Plasma panels are given. You can see and compare to that to your TVs', and can make sure about the fault to an extent.
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