ANy sign of DC filter caps with open top (may be that was the sound you hear was cap is blowing its tops). You need to do some voltage checking and some visual inspection.
http://www.shopjimmy.com/catalogsearch/result/index/?q=Vizio+GV47L&limit=100
You have to remove the heatsink to see the caps under it.
Post back what you see.
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed TV and monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
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