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Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
possibe dirty switch. Pull the back of the TV off and unclip the panel that has the switches in it. Spray contact cleaner into the switch while pressing repeatedly. Common problem with these TVs. will take about 10 minutes...good luck