Vizio E470vl Dreaded white logo no backlight

[dadof4]

So, I have (2) E470VL TVs both with issues. This first one had the back light on and a white logo, but no picture or sound. Based on some of the reading here, I purchased a new main board for it and that fixed it.

Here is the crappy part. The second E470VL, when you pushed the power button. The Vizio logo went from amber to white, but no back light, picture or sound. I thought I read here that a new power board would fix that. So, I ordered the new power board and it still had the same issue. Then, I got the bright idea to take the new main board that I put in the 1st into the 2nd TV. New power board, new main board, it should power up and work right? Nope, the back light started to come on. Then I hear a sound from the power board that sounded like a computer hard drive writing and the back light goes out and now I'm back to the white logo and no back light. The kicker is now when I put the new main board back into the first TV that worked, it now has the same problem! White logo with no back light.

Since the issue reproduced itself on the previously working 1st TV. I would like to troubleshoot what "blew" on the new main board to cause the issue. Any ideas on where I should start would be much appreciated.

[drpj23]

Re: Vizio E470vl Dreaded white logo no backlight

Can you post a high quality pics of the new main and the inverter(s) of the second tv mentioned?

[retiredcaps]

Re: Vizio E470vl Dreaded white logo no backlight

Follow my sig file below on how

1) attach pictures

2) test a voltage regulator since it is a Vizio

[dadof4]

Re: Vizio E470vl Dreaded white logo no backlight

Here are those images. If these are not good enough, I will take better pics tomorrow. Thanks

[drpj23]

Re: Vizio E470vl Dreaded white logo no backlight

What are the voltages on that connector on the power supply?

And for kicks, what happens when you put the main from the second tv into the first one?

The hard drive sound, sounds like arcing.

[dadof4]

Re: Vizio E470vl Dreaded white logo no backlight

Here is an image of the IC from the power board to the main board. I think this is what you were asking for as it relates to voltages of the connector.

Also, when I put the 2nd main board into the 1st TV. The same problem occurs, white logo, no back light.

[drpj23]

Re: Vizio E470vl Dreaded white logo no backlight

Ok, better question, do you have or have access to a digital multi meter?

The arcing possibly damaged the power supply or at least the inverter portion so now you are stuck with symptoms for the second (so in theory a p/s should fix the first tv). The main may be ok for both tvs.

Can you see an image on the screen (for both tvs) (i.e. in a dark room shine a flashlight and see if you can see a menu pop up?)

For the second tv, you may have a short in the backlight.

[dadof4]

Re: Vizio E470vl Dreaded white logo no backlight

Ok, so I have some good news. I was able to exchange out the main board that I just purchased and the 2nd TV broke. With the newly exchanged main board, TV 1 is working again.

drpj23, yes I have a digital multimeter. How would I test to see if I have a short in the backlight of the 2nd TV?

Thanks

[drpj23]

Re: Vizio E470vl Dreaded white logo no backlight

Well, first we are going to troubleshoot with the inverters disconnected since that was the probable cause for it. Install the power and main and see if it'll cut on and act as it is supposed to. With the multimeter, verify the voltages coming out of the power supply.

So for example
Connector JW34
Pin 1 - 24v - 23.87v

[vertondem]

Re: Vizio E470vl Dreaded white logo no backlight

What was the final outcome of this problem??

[homa35]

Re: Vizio E470vl Dreaded white logo no backlight

I have vizio E470vl first it quit working on hdmi ports then lost picture
I have sound when I turn it on but no picture
Can you help
Thank you

[retiredcaps]

Re: Vizio E470vl Dreaded white logo no backlight

It never ceases to amaze me how many people come here looking for help, but don't even bother to try or report the results of the suggestions posted earlier.