vizio vp322 powers on but weird pixelation

[jose6326]

I picked up this tv for free
The lady was going to throw it in the trash

I read previous posts on this model tv but nothing comes close to what im experiencing unless I misread something

Anyways when I press the power button(no remote control) it powers up, psu clicks, tcon lights up and ysus turns on with a noticable buzzing noize.
No logo shows up on the screen then this weird blue pixelation is going on.
I hope the panel isnt defective

I checked the fuses on the psu and they are good
No visible faulty caps
The y-sus board fuse is good

Here are the voltage readings
Connector on psu going to ysus board
Va 59.6v
Vs 190.4
5.05v

Connector on psu to main board
5.08v
12.11v
16.41v



After the tv has been on for a few minutes some of the blue pixels have disappeared. Not sure if this is good or bad

The 7th and 10th picture are blue pixels just like the 6th picture. The lighting in my room caused a different color but its blue


So what else should I test?

[Shinju]

Re: vizio vp322 powers on but weird pixelation

You need to find the voltage test points on the Ysus and xmain and see what they are. There is a sticker on the panel telling you all these voltages can you post a photo of that?

[jose6326]

Re: vizio vp322 powers on but weird pixelation

I did its pic number 11

And I tested the voltages at the connector

[Shinju]

Re: vizio vp322 powers on but weird pixelation

You are missing VZB, the test point is on the Ysus the arrow points to the leg of a resistor. VSC is also on the Ysus he test point is below a large red capacitor.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

i dont know why my camera flipped some of the pictures but i can retake pictures if needed

[Shinju]

Re: vizio vp322 powers on but weird pixelation

I believe the way this plasma is designed is the x and y are on the same board, smallest plasma made in the states as far as I know.

I have only got to play with one, never had the chance to own one to tinker with.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

Vzb is 79.4v

Vsc is -103.2v

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Yeah, VSC should be -185 and VZB 140 as per sticker spec. You got a bad y/x board. Lucky for you these are cheap.


Match your Ysus part number here and your are set.

http://www.shopjimmy.com/vizio/vp322...o+VP322HDTV10A

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Just to be 100% sure let's try the test patterns, ok on your controller board you will see 3 copper ring holes near the bottom right of the board.

With the TV off and the LVDS unplugged from the controller board jump R241 and R211 with a jumper wire and plug in the TV and tell us what you see on the screen.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

i ordered the board

thanks for the help

what causes this problem on the ysus?

[Shinju]

Re: vizio vp322 powers on but weird pixelation

LVDS cable connects the mainboard to the controller board.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

The red circle or purple circle is the lvds cable?

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Purple.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

Ok I jumpered the board like you said

I got several patterns with different colors but the patterns are distorted like the pictures I posted before of the blue pixelation

The paterns would go vertical and horizontal

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Question, the longer you keep this unit on does the dark splotches start to go away?

[jose6326]

Re: vizio vp322 powers on but weird pixelation

if you look at my first post pictures number 6 and 7 are when i frist powered the tv

picture number 10 is after the tv has been on for more then 10minutes

so yes the blue pixels spots go away but not all

i hope i am making sense

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Also while you have your TV apart I would replace the 2 3300uf Caps on the power supply and the 470v as the caps for spots C205 C241 and C236 (cannot remember their values) these are located near the plug going to the mainboard.

The will fail they are the other cause of these little plasma panels failures on the power supply.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

So I should replace all the caps in the red circle right?

And I should also order the ysus board right?

[Shinju]

Re: vizio vp322 powers on but weird pixelation

Sure, those are them. This looks like a sustain failure if it was mine I would take a chance for 20.00 +ship, these are cool little 720p tvs.

[jose6326]

Re: vizio vp322 powers on but weird pixelation

I will order every thing tomorrow morning

Thanks for all your help