My vizio tv has no picture but has sound BUT it started a few weeks before that where the screen got darker in a few spots and then eventually went all black.

The Vizio "E" (economy) series sets have local diming, on most brands if some of the lamps go bad the screen is black but not on these model Vizio TV's, for this reason it's harder to troubleshoot the set for possible bad backlights or backlight inverter issues. If you have a LED backlight tester you can test each zone at the backlight connector off the inverter board to see if each is working, without a tester you're going to need to remove the panel then move strips that don't light to ones that do and see if it's the strips bad or inverter issues.

Set is wearing out..cheapr to buy new then fix. For now unplug tv for awhile n see if it temporary clears. Also w new tv put alittl fan inback to turn off n on...cause heat kills televisions like it does to computers

This sounds like a heat build up in the TV set if not ventilated properly it causes the shading effect on the screen coating causing the dark area eventually it takes over the whole screen

Hi Brandon,
I am afraid that the dark spot in the screen is not repairable. Manage as long as you can or go for a new tv.

My 2006 model had a problem right after I bought it, it started getting colored splotches all over, so I called panasonic and they said it could not be fixed....since I bought the insurance they sent me my money back for the tv. About 2 weeks later I got a call saying the panasonic company had sent in a repair ticket and made an appointment to come fix my tv....it turned out to be an eeprom reprogramming problem. They fixed it and panasonic paid for it. :-) The tv had a beautiful picture after that up until about October 2013. When you replace the lamp, it's important to clean out the area the lamp goes into. I wipe everything in there with a soft cloth and I also use the crevice tool on the vacuum to vacumm it out really well. Seemed to make a difference to me. But depending on the age of your tv, it could judt be a sign that something is going wrong in the light engine. My tv got darker (I just went in and lightened it in the settings) and after awhile I had to replace the lamp more often and then it started getting tiny blue spots around the perimeter of the screen. The grandkids called it the milky way. It eventually got red vertical lines and they would go away if we turned it off for a few minutes, but after awhile they were here to stay....the light engine was definitely going out. So, now we have a new 65" tv.

THE MAIN BOARD AV BOARD HAS WENT OUT JUT HAPPENED TO ME TODAY

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/shawn_b2b2e24a98865a53

Check and replace the back-light inverter baord.

REPLACE THE LAMP IT IS LOCATED IN THE BACK OF THE TV THERE ARE INSTRUCTIONS IN THE OWNERS MANUAL FOR REPLACEMENT IT IS CONSIDERED CUSTOMER REPLACEABLE ITEM.
PART NUMBER 915B403001 Lamp (180W)

This sounds like tiling. are you using a cable box?

Does it do this with other input devices? Sounds like a electrical surge.