Vizio VO420E - No Video But Has Backlight,Sound.

[dodadew]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

I was off on my numbers...I guess I read them upside down or am dislexic or something...but Backlight on 0.33a and VIzio logo / blue screen .57a

[budm]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

OK, that is good. You can jump that L57, that L57 is used as a little filter so the very high frequency noise generated in the T-CON circuit will not be fed back into the power supply, you may not notice or see any noise on the screen. It is not much of inductor.
You may be able to use one of these that can handle 2A or more, the vlaue I am not sure, but one with low DCR will do.
http://aemcomponents.com/products/sm...ors-and-beads/

[dodadew]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

I will just jump it and give it a few days of use to see if I get any noise in the picture...if I do at the point...I will grab a few different beads and give them each a try. They sure don't make it easy to find a value on them.

Thanks so much for your help...I am positive I would not have been able to single out one little SMD bead in this whole board without your guidance. At least I can say I do know how to solder SMD parts so you wont be hearing from me if I had accidentally lifted a trace or pulled off a few resistors. Lets hope this was the only problem though, but I feel confident it was.

[budm]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

Please keep us post so we will know if you have any other problem. I am glad it is not the LCD panel problem.

[dodadew]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

Well, I have a new problem...I put it all back together and started a movie in it...this was on the kitchen counter. Now the problem is that I cant peel my kids away from it. Dont see any noise in the picture...and I am also glad it was not an LCD problem. This fix was much cheaper than a new mainboard, and for the $30 I have into it I think it was a great find.

[budm]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

I wonder how many people know about the cause of this problem, I am sure you are not the only one with this symptom. Hopefully other people will search for the solution and find this site.

[dodadew]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

That's how I found out about the site... Hopefully Google quickly indexes it. I checked my other TV... Same model and same board... So when that one breaks down I can fix it too. Hopefully it won't.

[dodadew]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

I would say to check the t con.

Thanks to you too... It was not getting power.

[audiofreak19]

Re: Vizio VO420E - No Video But Has Backlight,Sound.

No problem. I'm glad you were able to fix it and also learn more about how your tv works