Did the sound work before? No sound on ALL modes?
Service manual: http://76.254.74.102/Updated%20Field%20Tech%20Service%20Manuals/Vizio%20Amtran%20Field%20Tech%20Service%20Manuals/L%20Series/L37HDTV10A%20Service%20Manual.pdf
User manual: http://www.retrevo.com/support/Vizio-L37-TVs-manual/id/3068ag223/t/2/
http://s807.photobucket.com/albums/yy352/budm/VIZIO/Vizio%20L37HDTV/
Look at page 28 and 47 of the user manual, the On screen sound setup, there is the SPEAKER ON/OFF setting on the sound setup. The 'FIXED' is for audio line out (for RCA audio line out) is to let you select the RCA audio output to be variable (control by the TV remote control) or be at FIXED level output, this function is NOT available for this model.
You can find out also if it is the amplifers circuits problem by connecting powered sepakers to the RCA audio line out to see if you can get the sound OK there.
Remote:
Parts: www.shopjimmy.com
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/
Testimonial: "testing out suggestions tomorrow...lot of great ideas and info...thanks...budmrtn"
Go into ur tv Menu goto OPTION go down to Output Select,press enter make sure selection on (Fixed).This fixed selection will pick for the tv out put to tv speaker.Tv should have sound now on it speakers.Try website like Remotes.com to buy the tv original remote work for the best used for to reajustment setting and setting on the tv Menu.
Testimonial: "testing out solutions tomorrow...thanks so much"
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