Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
SOURCE: Vizio VW42LFHDTV10A
I give you a site for do it your self repair..
http://www.lcd-television-repair.com/
SOURCE: Vizio L32 32 in. HDTV LCD HDMI input not working
I recently had the same problem with my vizeo hdmi port # 1 going bad. Tried everything to fix and called vizeo. There solution for a master reset was turn off tv and unplug from the wall. then hold down the power button for 30 secs and let go. plug the tv back in and hold down the volume down and input select buttons down on side of the tv for 15 secs. release the buttons and turn the tv on after powering down all the components connectd to the tv. If this does not work they told me you need to have it sericed for a bad hdmi input. Hope this info helps anyone out there. It didn't work for me. Its a bummer cause the tv is well taken care of and only 18 months old. Best of luck to all others.
SOURCE: 50' Plasma won't turn on. No power.
hi, i have the same unit and did the same as yours i open it up and it had a blown fuse on the main board there four fuses. mines had ones of the two fuses on the right lower corner of the main board blown out i replaced it and worked fine again.
Testimonial: "Ours ended up being a blown fuse too. $2 and we are back in business! YEAH!"
SOURCE: vizio p50hdtv10a. Tv has sound
sounds like you needed to replace your video fuse before anything normally if you have video but no sound its an audio fuse and vica versa if for some reason both were out I would say your in need of a new power supply I would suggest replacing the fuse and if it still does not work contacting a service tech to run a diagnostic to see what exact part or maintenance you need
Robb
SOURCE: My Vizio vp50hdtv20a has no video but has audio.
A lot of Vizio sets had a habit of the T-Con board fuse opening for no apparent reason. It's a rather small surface mounted devise (smd) that does not look like a fuse your accustomed to. Best to let a professional make sure.
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