Question about LG DU-42PX12XC 42 in. Plasma HDTV

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Colorful "speckles" on screen

I have coloful static looking speckles. What causes this? I already replaced Y-sus.

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You will need to replace the conrol circuit board. This also rrepairs the intermittent "red/blue/green" band that can appear anywhere on the panel.

Posted on Feb 28, 2009

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Could be the screen burn from watching T.V. on a show and the thing burnt in (in this case the colors, yes it can burn colors.) and there's nothing you can do. The insides of the T.V.'s have plasma gases which can flow out of control.

Posted on Jan 29, 2009

  • Todd Hill
    Todd Hill Apr 11, 2014

    adjust vs voltage. if it dosent come out,bad panel

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Sounds like the y sus was blown out but what cause it. Were you careful when you were checking voltages? As long as you didn't short 2 components together, your y sus should be fine. Unless the y buffer up and/or down blew them out. Even the panel could blow it.

Basically you need a scope to adjust the ramps and everything. You can adjust VA and VS with a meter. If you don't have access to a scope, then just start changing the ramps etc by eye. It might take a little bit to get but eventually you'll get it.

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I'm not sure: on the Y-sus board there are 3 small power supplies. ( 3 small transformers standing together. They supply 15 volts each.) One of them supplies the 15 volts for the z-sus board this one might be defective. Replace the Elco's on this one by ordenary elco's (low -ones) in stead of the smd- elco's .

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I had the same problem with my TV. It was a horizontal problem with different shades of color, and black spots. I replaced my Upper & Lower Y-buffer boards. Your Y-sus board should be okay since it still powers on the screen. You should replace the Y-buffers Upper & Lower, and it should work. I hope this helps.

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Hello,
As per your description Your problem may be with Y-sus board.(It could be 50:50 chance of Y-sus or Panel)
How to confirm:Follow these instruction.

On Y-sus board there is 2 preset Variable resistors VR1 and VR2.Try to adjust slowly VR1 first and see any change in your Plasma Panel.If speckle amount reduces change Y-sus.

Otherwse you have a bad panel.

Dont forget to rate!

GoodcLuck
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if unit is still under warranty, utilize it. otherwise your y-sus bd is failing. the problem will get worse. hope this helps.

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