SOURCE: Vizio GV47L screen went black and is now unresponsive
Change the main board if you have good picture and sound. If you don't have picture and sound, the inverter will also need to be change.
SOURCE: My Gv47L Vizio made a loud pop and the screen went
The loud pop has been made by an electrolitic capacitor that literally exploded - almost surely it's on the power source board. Since you still have some form of control over it the capacitor must be situated on the high voltage section of the board and surely there are others that are close to failure in there. Open the tv, locate and replace all the failing or failed capacitors. Tutorial on how to do it.
http://www.youtube.com/watch?v=YCSNWi3UHf4
If you have never used a soldering iron then watch this
http://www.youtube.com/watch?v=1gC3KRfQXwo
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