42" Vizio VW42L Vertical Lines and Crazy Picture!

[Glitcher]

I got this TV for free, turned it on and there's a bar of rainbow vertical lines. I thought to myself damn looks like another bad panel... However I noticed that the TV wouldn't turn off unplugged (typical voltage regulator problem I read about). I unplugged the tcon, and the lines went away. unplugged one side of the tcon and the lines went to the position where it was still plugged in.

I'm not entire sure if its just the main board. Didn't really want to mess with it anymore thinking it might be a bad main problem AND panel.
But I decided to look at it again today and it did something crazy while I left it on for awhile.

More lines appeared in the screen but then it did a crazy faded transition into blue and green static and etc. See the video! It shows everything, since its kind of hard to explain.

VIDEO OF PROBLEM: (It gets good at around 1:28, and don't mind the music =])

[Glitcher]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Looks like my wifi is down.. Can't upload the video til later.
Here are the voltage regulator readings

U7
Amc1117
0.02
1.02
2.07

U33
Amc1117
1.29
2.07
5.10

U9
K1117s15
0.00
1.20
2.07

U8
Amc1117
2.02
3.27
5.13

U2
Amc1117
2.05
3.29
5.10

[budm]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Another one of those bad U33, 1.25Vref + pin1 1.29V the output on pin 2 then should be 2.50V, you are only getting 2.09V, this 2.09V is fed into U7 but it is too low for U7 to work.

[johnboy1313]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

I would change U7 while I was in there too. It is common for those two to go bad.

[Glitcher]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Heres the video. The transition happens at 1:28.
http://www.youtube.com/watch?v=svG3G...ature=youtu.be

Well I just replaced the U33 regulator and the tv is working back to normal!

[budm]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Another success repair due to bed LDO regulator.

[tom66]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Nice one. I had a bad regulator on 37" BEKO chassis recently. I think that's the 4th one I did. And they're always those SOT223 1117 types. They are OK if kept cold, but I think the manufacturers dissipate too much power in them leading to early failure.

[Glitcher]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

This is actually my first repair on the vizio regulator problem. I've read about them a lot but never actually came across one til now. I even almost gave up thinking it was a panel problem, but I had some extra time due to the current snow storm and decided to take a look.

[truep]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

I would use a heat transfer glue and glue a small heat sink to the regulator. It does take a day to set though.

[ivtec]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

I would use a heat transfer glue and glue a small heat sink to the regulator. It does take a day to set though.

Hi truep: what about a little pc fan?

[ivtec]

Re: 42" Vizio VW42L Vertical Lines and Crazy Picture!

Hi truep: what about a little pc fan?

Hi truep: it's me again, i have the exact same tv modle# and i did repair the inverter boards for the bad caps, and it's running great,but when i turn it off or on it kinda clicks for a few seconds while the caps have charge like a click of a relay or a regulator,nothings that affects the tv , does yours do that?