The sound proceesor may have gone out or the power amplifiers that drive the speakers may have gone bad. Try this first to narrow down the problem, try hooking up powered PC speakers to the Audio line out RCA jacks to see if you do get sound there, if it is OK then you have problem in the power amplifiers section, if you do not get sound, then the sound processor has gone out, both the sound processor and the power amp are on the main logic board, You do do get sound from RCA jacks you may want to keep using it that way since the main board and the labor for repairing LCD TV is not cheap.
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The sound proceesor may have gone out or the power amplifiers that drive the speakers may have gone bad.
Try this first to narrow down the problem, try hooking up powered PC speakers to the Audio line out RCA jacks to see if you do get sound there, if it is OK then you have problem in the power amplifiers section, if you do not get sound, then the sound processor has gone out, both the sound processor and the power amp are on the main logic board, You do do get sound from RCA jacks you may want to keep using it that way since the main board and the labor for repairing LCD TV is not cheap.
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
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