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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How do i fix my LG 50PC3D all of a sudden it has a grainy flashing screen and i hear the static through the speakers so it has sound.

Contact the authorized service cener for LG; in this case. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.

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If the unit has not previously had the PSU or Y-SUS boards replaced prior to this issue. Then it sounds like the voltages are off on one of those two boards. There is a process for checking those voltages and trying to adjust them. If those boards were recently replaced I would say the tech did not check voltage accuracy. But if it just happened out of no where go with the Y-SUS board as the problem. I say that because the unit powers on.

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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 .

This might solve the problem. On the other hand you should realy measure this one out...

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might be a ground issue. plug it into other outlets and make sure the ground prong is still attached to the plug.

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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!


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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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contact your cable provider, and let them know what is going on to your cable..^.^

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hello misterwuggle, I Have a DS Of my own, but have never had this type of problem. All I Can Think of is going to get it looked at. Try going to your local video game store, such as game. Hope This Helps! Rosebetts xxxx

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