Hi, I have a Vizio E550VL the TV turns on for about 30seconds and then turns off by itself. I just installed the power board (0500-0513-1140) (N312a001L) I still have the same problem. I was hoping it was a bad relay on the power board. i was reading that it might be the EEPROM? $15. The other board is 3655-0112-0150(3D) i see the price is $151. Do you think either of these will fix the problem?
Fault to its main board. What else to check? Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
SOURCE: power
The reason the tv is turning itself off, because most TVs have a "Protection Mode" that turns the unit off when it detects a failed part inside the tv.
The most likely the tv has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
Being that the TV is under a year old, it should be still under manufacture warranty. Last thing you want do is void the warranty by opening up the TV. Here's some info to get you started on the warranty:
http://www.vizio.com/support.aspx?id=1588
If it not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.
I hope I shed some light on the subject for you.
SOURCE: TV WILL NOT TURN ON BUT VIZIO LIGHT IS ON
The Service Plan from Walmart is an "extended plan" on top of the manufacture warranty. Your Tv is still under warranty from the manufacture.
Here's a link to get the info you need to get started on a warranty claim:
http://www.vizio.com/support.aspx?id=1588
SOURCE: Vizio VX42L LCD TV died?
it is the power supply. in the given scenario like yours, the PSU is the suspect in 90% of the cases.
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SOURCE: My VP504fhdtv10a vizio plasma TV when connect
Logic Control D Board got nothing to do with this problem. This is your main power supply gone bad(usually not the sub power supply). I just repaired my VIZIO by replacing main power supply. Just remove back cover and your board will be right in the middle of the screen. Just get board part/serial # and google it. My best price was through eBay(around $100). Everything is fine now.
AUO 55.54T01.C04 T-Con Board 
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