Vizio e500i-b1 turns on with logo then backlight goes out. Already replaced power board and mainboard. It will work if it is unplugged and " Cools Down for a while ". Any way to fix this?

SOURCE: Vizio VX37L HDTV10A no picture

Hi.
You need change the Main board. You have a micropros. problem.

Zane Paul

• 1 Answer
• Posted on Nov 13, 2014

SOURCE: i have a vizio razor led m470vt. power light flashes dim to bright. no screen but have 120v into board. replaced power board but did not fix????

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.

SOURCE: Vizio tv sv420m need help

Sure that the other boards you used were any good? If so, then try the Power supply board since the other boards of your set other than the main board specialize in the video aspects. Since you have no audio the only two boards that could account for no audio are the main board and the PS board which powers everything in the set.

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SOURCE: My Vizio E500i-B1 won't turn on, replaced the power board, still won't turn on. 24V pins are only putting out 15V, PS-On is outting out .3V. What can I check next? Please help! Thanks!

Disconnect all the circuit boards from the power supply board and test the voltages again. If the voltages are correct, connect the other boards one at a time to see if one is dropping the voltage on the power supply. If you find one that lowers the power supply voltages to what you read before, that may be the problem board.

The Knight

• 76851 Answers
• Posted on Jan 25, 2016

SOURCE: Vizio E500i-B1 won't power on unless power is cycled. After unplugging/plugging it back in it will work but it may need the power cycled a couple of times to get the audio and remote to work reliably.

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.