Question about LG 42PX5D 42 in. Plasma HDTV

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42" LG plasma tv multicolor vertical bars

Hello,
I was wondering if you could help me in diagnozing a problem that I have with my 42" LG plasma tv (RU-42PZ61).

The initial problem started with two vertical red bars ~2" on each side that would occasionally go away and then return.
By poking around I found to be a possible cold solder joint on the control board (6871QCH038A). By wedging a piece of wood behind the board it would work ok for quite a while. Until one day the image detriorited completly. I believe that I heard a pop one day. I ordered a replacement for this board w/ a different part # (6871QCH060Q) that they said replaces the old one ($240 outch..).

The board replacement did not fix it completly; now it has verticall lines of all colors.
(When I switch to an input that has no signal, the screen reduces to a narrow vertical strip of about 6 or 8"). So I believe that another board was also damaged. (sound is ok)

How can I determine what board is at fault?
On the tuner board (6870VS1984E) there is an led that flashes near the (eeprom?) long IC on a socket. I don't have the service manual for this set.

I will be very thankful to any help that you could provide me with.

Best regards,

Luis

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  • 3 more comments 
  • Ruka Mar 28, 2008

    i have same problem with my 42" zenith ,

  • bunkers Jul 14, 2008

    Luis, I would love to hear how your problem turned out. I have the same problem with my LG DU42PX12XC 42" plasma purchased in 9/2005. It had a red dot problem that was fixed after the second repair attempt.



    Then more recently, developed a blue bar on the right, then both a blue and red horizontal bar on the red side ... then finally it shuttered and now doesn't display hardly at all. It will after resting, but only for a few minutes before crapping out. Sound work fine, picture fine when it wants to ... but the bars remain and its ability to stay up isn't there anymore. I'm wondering if the 6871QCH060Q part will work on mine. Did you have to replace anything else? Thanks, Scott

  • Anonymous Dec 07, 2008

    Did you ever find a solution?

  • Anonymous May 03, 2009

    TV was turned on and off at wall 3 times and then the multicoloured vertical bars come on. Changing input gives the same 8" RHS side bars, the sound seems OK. After about three or four minutes, the tv turns off. I think it is screwed!. The LG man on the phone said it is either the Picture board needing replacing or the screen is wrecked.

  • macosirb May 18, 2009

    I have the same problem on
    LG RU-42PX11, multiple coulour vertcal line, please can you let me know what I can do. Thanks

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6871QCH038A......I replaced this board with one bought at Parts Store.com for 112.00, number 6871QCH038C. Set now works like new with no problems. If this is such a wide spread problems with these sets, LG should have done something to help....

Posted on Oct 08, 2009

Never buy LG products again !

Posted on Sep 06, 2008

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