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LG plasma tv RU-50PZ61 has greenish snow in picture.

LG plasma RU -50PZ61 TV.


Bought this tv as is, and it had a Z-pcboard problem.
Rebuilt the Z-Board, changed all electrolytic caps on the board.

Checked the power board and looked at the others briefly.

Tv now works, but I have noticed when the image on the screen changes, and mainly when going into a picture with a lot of black,there is a lot of greenish snow on screen for a second or two. This happens in al video signals.

The greenish snow seems to appear in the dark areas of the picture.

thanks Bill I.

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  • William Infantozzi Jan 31, 2009

    The Vs, and the Va voltages are right on .
    I have a service manual, but it does not address the tweeking of the adjustments on the y-sustain pc board.
    I need test points , or scope points ,and a procedure in order to tweek any of the adjustments, I don't want to make it worse.

    If you could further help me I would appreciate it.

    thanks , Bill I.

  • William Infantozzi Feb 03, 2009

    Need a step by step of how to (tweek)(adjust) the adjustments on the sustain pc board.

  • William Infantozzi Feb 04, 2009

    Does anyone know how to adjust the controls on the sustain pc board, of this tv? RU-50PZ61

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Hi!
Have a look at link below.
(The data of adjustment voltage may be on label, which is attached on the metal part under Y-Sustain
board)
http://www.iwaynet.net/~nesda/DW42Wide.pdf

Posted on Feb 04, 2009

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This may be a burn in effect. plasmas are notorious for this.

Posted on Feb 03, 2009

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It can be due to loose inter nal soldering joints and mostly gets solved br cold soldering whole board .

Posted on Jan 31, 2009

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That is called diffusion. that can be adjusted out in most cases by adjusting the y sustain pcb but can also be the main pcb, the logic pcb and panel itself but not likely 

Posted on Jan 28, 2009

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