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

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Have sound, but only bright mostly yellow vertical lines on my LG DU-42PX12X .

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  • Corey Knoettgen
    Corey Knoettgen May 11, 2010

    Is the cable or sat box connected using an HDMI cable, regular cable, or Red/Green/Blue cable? Do the lines appear when you press the "Menu" button on the Television (not the cable or sat) remote? Do the yellow lines appear on another source - on a dvd player, for instance?

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  • 8,596 Answers

Since I haven't heard back ,I am clearing this from my queue. Best of luck.

Posted on May 30, 2008

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1 Answer

LG DU42PX12X - red and pink vertical lines.


I know this post is old,
But I had the same problem.
I was able to fix it.
Heres a write up I did on the "How To".
I added pictures and diagrams too.
http://jasonkoller.blogspot.com/2011/02/lg-du-42px12x-plasma-tv-fix.html

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Mar 15, 2010 | LG DU-42PX12XC 42 in. Plasma HDTV

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Red line down right and left side of 42" LG plasma.


Hello; I am John at J D Electronics in Poland, Maine. I have an LG TV that was donated to me. It is a plasma model DU-42PX12X. It had 1 inch wide red and green vertical bar on the right and a blue and yellow on the left. These bars appeared intermittently. pressing on the control board would make the bars go away. I have read many blogs on this problem and they all say to replace the control board located under that huge A / V input board ( held in by 4 screws on the large aluminum frame). The original part is # 6871QCH038A The replacement ends with a C instead of an A Aprox 90 to 135 dollars. This board is used on many different LG and Zenith models and is a HIGH failure rate part. I like to know WHY parts/boards fail and I found out why this board fails. There is a large square IC in middle of the board aprx 1 1/8 inch square. This type of IC is called BGA or Ball Grid Array. The solder connections cannot be seen , since they are under the IC . This IC was not properly soldered at the factory and that is why hundreds of these sets failed. I used my hot air soldering station on it's highest setting to heat up this IC . The IC must be directly heated from the top and some heat on the bottom of the PC Board. Liquid flux should applied to the 4 side edges of the IC prior to heating. The bars are now gone! To get to this board, remove all perimeter screws and all middle screws of the back cover. The A V board will hinge back to expose the control board if you unplug the cables to the side inputs and the one to the button board. The set will still run face down on a table with something to prop up the bottom screen so you can watch the bars. If the set was run for a long time with the bars, there will be some darkening where the bars have " burned" the screen. This is perminent, but usually acceptable.

Sep 18, 2009 | LG DU-42PX12XC 42 in. Plasma HDTV

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Vertical lines on LG-DU-42PX12X


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Issue with LG Plasma tv model # DU-42PX12X


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1 Answer

LG DU-42PX12X Plasma, picture startes flashing then goes black after a few minutes


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caypianan@yahoo.com

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5 Answers

Were can I get this board 6871QCH038A


the actual problem are the solder balls under the chip it can be fixed easily by reworking it, we have done it in a few dozens tv so far with excellent results the usual problems are: red vertical lines , one half of the screen not working, color lines and it usually cost only the time to perform it.
azhdtv at 85040

Jul 16, 2008 | LG DU-42PX12XC 42 in. Plasma HDTV

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DU 42PX12X LG


What have you tested so far?

Jun 20, 2008 | LG 42PX5D 42 in. Plasma HDTV

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LG DU-42PX12X Verticle lines of various colors, and widths throughout the screen.


Check within you area for a reliable LG repair center. To fix the problem of the blue, red or green vertical line you just need to replace the control board PN 6871QCH038C. The part cost about $150.00 and a honest repair center should not beat you up to bad on the labor. Good luck and Good viewing.

Feb 06, 2008 | LG DU-42PX12XC 42 in. Plasma HDTV

3 Answers

Vertical lines all over...have pic


I had the same problem on my DU-42px12xc. Red, green , and blue lines vertically on the right side of the screen. I found a loose solder connection under the inputs board on a resistor. After re-soldering, everything was crystal. I'm happy I grabbed this tv before my work threw it out. Be very careful when soldering SMT components. Use proper equipment. I had to troubleshoot while the tv was on, so I was extremely careful not to short anything out.

I pulled the inputs board out to gain access to the "Y-axis" pins.
41d5250.jpg resistor located under the inputs
fd8bf0e.jpg9d002b6.jpg I started pushing on the resistors 'till the color lines started working correctly, and re-soldered the four resistors.

Jan 23, 2008 | LG DU-42PX12XC 42 in. Plasma HDTV

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