SOURCE: my 42inch vizio flat screen tv has no sound. Great picture
check the sound set up menu first if set to off. if ok check the speaker weather is worn out.
SOURCE: vizio e420va no power no light
Suggest to plug unit in another outlet and run basic troubleshooting again as per user guide.
May want to unplug unit and hold power button for 30 seconds for power cycle.
May want look very closely to screen to see if you are still able to get moving images. (Backlight might be dead)
If none works suggest service for unit.
Ref: http://store.vizio.com/documents/downloads/hdtv/E420VA/UM_E420VA.pdf
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