My VIZIO E500i-B1 recently stopped working (again). A couple months ago, the Vizio logo would flash on the screen for a second and then go black but I still had audio. If I left the TV unplugged while I was at work, came home and plugged it in, it would (usually) work just fine. I replaced the Power Board and for a month it worked like it was brand new. Now today, the logo MIGHT flash on for a second then a black screen with audio, OR it just stays completely black with no audio. Backlight is not turning on either.
You might want to check the VIZIO website for help. Given how cheap even 4K UHD TV's are today, probably not worth fixing again. Unless under warranty, of course.
Fault to the main power supply regulator section. 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. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
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.
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