Vizio SV420XVT1A LCD 2 Seconds to Black

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

But I should be able to jump the 5v to the ps-on with a 1k resistor, to power the board up but I don't know if that will work.

[budm]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

But we already know that the PS_ON is working since you are getting the correct voltage on the large cap since you had install the new Main board, right now the Inverter circuits just goes into shutdown for a reason.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

So there is no way to power the board on if it's not fully plugged into the main board and grounded to the chassis?

[budm]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

You can turn it on as you did before using the resistor between the PS_ON and the 5v standby pin, I thought had done that before.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

I was going to but had other things to test first, need to go get the resistor and give that a shot. Hopefully I can find a 1k resistor tomorrow.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

So I buckled and decided to buy the power board there was only 1 in stock so I did not want to miss out on it. It was 89 +core so once I get that in we will see if it was worth it.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

Tracking part now estimated delivery tues 4/10. Will post results when I get it and install.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

So part came in replace ps board and everything is back up and running. Thanks budm for putting up with me. This forum is a great for help and I will definitely be back.

[budm]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

That is great news, thank for posting the result. By the way, what are you going with the old board, I would not mind buying from you since there are more people with the same symptom as yours, If I can figure it out then I may be able to post what I found what went wrong with the board. Ooops, I see that they charged you for the core.

[Crimsonmt]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

Yeah im glad to have it working, the place i bought is holding a core charge which is to bad if that was not the case I would have definetly dontated for the cause.

[hursey013]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

This may be a long shot but I think I'm having a similar problem and I was hoping if you can advise if you think a new powerboard is the correct route for me to go.

42" VW42L Vizio LCD - When I power on the tv, the Vizio logo goes from amber to white. The backlight flashes for a second then goes off (seems to stay on for 2 seconds first time, then progressively less time each subsequent time until its just a flash). Audio works, no menu. I took the back cover off and don't see any visible damage, although when I do turn it on there is a brief static sound that happens that corresponds with the backlight being on.

Other than that, and you didn't mention this in your post, but this just didn't happen out of the blue - for several weeks my backlight would flicker in such a way that it seemed that it was slowly going out. One day it was flickering and finally just went black.

I don't have nearly the expertise you have to test all the electrical outputs so this is more of a "hoping to get lucky" option in replacing a board rather than having to pay a repair shop or buy a new tv.

Appreciate any help you can provide, -Brian

[mark2924]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

Ive got the same TV but a different problem, no 5vdc coming from PS board, tested the above mentioned cap and only have 165 volts dc, where should I look next? Also on the transformer that supplies 5 volts I have nothing on the 5 volts side and 165 on the feed side....

[budm]

Re: Vizio SV420XVT1A LCD 2 Seconds to Black

Since this thread got to be very long and it is hard to go back and look at all the old pictures, it will be easier for me if you will post good clear pictures of your board that way I can see if there is any simple thing I can see on YOUR board. Post both top and bottom side. Then pictures of 1/4 of the board of the so I can see real close up.