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.
I have this same problem with my Vizio. Model E601i-A3
60" LED, believe. Maybe 64"
Anyway, the solution is much simpler than these other answers make it sound. 1) Unplug tv from wall.
2) Unplug all external devices (all HDMI ports, any cable hookups, any rgb/vga connections, and any speakers attached.)
3) Unplug USB drives/attachments.
4) Plug TV back into outlet.
It should power up just fine. Then you can go ahead and reattach all your devices WITH THE TV SCREEN ON, reattach your USB sticks and you should be good to go.
Every time the TV is moved or is unplugged for any period of time, follow these procedures. The real culprit is the USB drives - the TV, like many laptops I've had, can't boot up with them attached. Thankfully once the TV learns what they are they no longer have to be removed.
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
Testimonial: "The blink code does not apply for this model. It seems more of a firmware issue. Someone suggested the 30 seconds reset multiple time which seem to do something because now the tv powers on and goes to the Vizio logo screen and just sits there. After about 2 minutes, it power cycles. I currently have an Ethernet cable and a blu ray connected to it to see if it detects any incoming signals. So far nothing."
SOURCE: How do I fix my VIZIO TV?
Vizio TV Repair - Instructables
www.instructables.com/id/Vizio-TV-Repair/
InstructablesSo my Vizio TV was flashing on & off rapidly every time I switched it on. ... good way to get something to work, but it got things working until I had time to repair it.
Fix Power Problems In 5 Easy Steps: What To Do When ...
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Aug 26, 2015 - Vizio TV power cord plugging into a power outlet. Do you know ... Powerproblems might require service or replacing parts inside the TV. Before ...
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