Check the speaker/s. 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. Pull up older posts. Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. http://electronicshelponline.blogspot.com/
SOURCE: Need SHARP LCD TV LC-22L50M-BK Service Manual
hi go to this link to download the manual.thanks hope you rate my response.
http://www.sharp.com.my/aquos/operation_manual/lc22l50m_en.pdf
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