Let verify first to narrow down to where the problem can be, attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. Please post back what you find. You may be better off if the sound does work through the PC speakers, to get the TV repaired; it will be more than $100 and up.
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http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
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Sound from the PC speakers is the same quality as the internal TV speakers.
That means you have sound processor problem, which means you will have to replace the main board which is not cheap and if you can get one.
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