VIZIO P50 HDTV20A Plasma Distortion on Screen

[CSF]

The set has distortion like the text showing the channel is in a slight zig-zag patter, also an occasional flickering on the entire screen.
There are 12 capacitors bulged on the power supply board and in testing the voltage it was low from 1 -2 volts below what it should be on all but the 24 volt. Could that cause the issues I'm seeing on the screen?

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

we can't see any issue!

replace all of those caps and see if that changes your fault.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

I'll phrase it another way. Would low power cause display problems like the ones I described?
If the answer is a definite NO why put money in it right? Thanks.

[dskall]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

The answer is most likely the caps are causing ripple feeding into your control boards and creating problems with picture

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

you can not even start to look for any other issue till you have sorted the ones that you know about.

as far as to what the tv is worth to you, i'm afraid that only you can answer that question.

[tvtimmy]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

YES! Start there. Change the 12 bad caps then do some voltage tests if it doesnt clear the fault.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

I'll order some caps and give it a try. Thank you all.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

I replaced 12 obviously bad caps. The voltage is 4.56 for 5, 11.1 for 12 and 22.2 for 24. Not as good as I had hoped. The picture is no better either. I've uploaded a video because the issue is hard to describe. The bright and dimming you see is actual and the close ups show the distortion and blur.

https://www.youtube.com/watch?v=ddqt...ature=youtu.be

Any ideas about where to start and where to junk it?

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

post pics of the whole back of the set and of each board. in particular, pic of control board.

hopefully we can run the test patterns and narrow it down.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

Here the pictures. Part of 2 boards are under the sheet of steel. I can remeove it if need be. Thanks.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

The board in 100_6061 has been replaced.

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

The board in 100_6061 has been replaced.

which board is that?

the control board is the one in the last pic. you normally jumper auto-ext-gen
(but i'm unsure of the way it is done on this board), and remove the lvds cable. that is the one that goes from the control board to the main board. then apply power and you should get test patterns. if the fault is still present, then it is most likely your control board and if it has a clean picture, then it is your main board causing the picture issue.

hopefully someone that knows this control board and let us know of the jumper set up.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

This one, I think its called the Z board sometimes.
I'll look auto-ext-gen and see if I can do that diagnostic. It would be very helpful if some one knew that control board. Thanks for your help.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

I see it the EXT_AUTO_GEN. It has 4 pins on it, so I don't want to go poking around without a map. Here is a picture.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

Okay I found this thread that told me how to jump EXT_AUTO_GEN and get a test pattern.
https://www.badcaps.net/forum/showthread.php?t=57818

I took a video of the test. The pattern was snowy and the bright flashing was still there on some patterns although not as bad. Near the end of the video notice the text in the corner of the screen. It is from a local TV station WSBT and it's like it was burned in, for lack of a better description. FYI I can get a good control board on ebay shipped for $6.99.

https://www.youtube.com/watch?v=VYQw...ature=youtu.be

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

can you show a pic of how you did the jumper, so others that see this can have the information as well.

from the vid, i would say that the control board is good and you are looking at a main board issue.

the burn in can probably be reduced by running a white wash pattern over it for a while, but you will need to check your voltages since you have changed out the x-main. first, you will need to get a good pic though.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

I'll edit a picture to show the jumper set up. From what you told me the test patter must have been okay? It wasn't as clear as I expected it might be.
So the board in this picture is the main board correct.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

To jump the EXT_AUTO_GEN for a test pattern see picture.

[CSF]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

As for the x-main, I could put the other one back in. It didn't make any difference changing any how.

[attainteddragon]

Re: VIZIO P50 HDTV20A Plasma Distortion on Screen

the picture looked ok to me, but you get to see it first hand.

the main is the one that you have indicated.

maybe wait to see what others think as well.