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LG DU-42PX12X/12XC colour issue

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    #1

    LG DU-42PX12X/12XC colour issue

    I have an older LG DU-42PX12X/12XC.
    Yeah, I know, pony up and buy a newer model. But I have had this one for awhile, and don't want to spend the $$ unless I have to.
    I think, based on previous posts, that my problem could be those pesky solder joints on the coils, but wanted a little reassurance before I pull this thing off the wall and open her up.
    Problem: Color "posterizing", as it's been referred to on this forum. No other problems, and it has just started getting noticablly worse in the last 3 days. Not unbearable, but still like "paint by numbers" color.
    Am I right about the coils?
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    #2
    Re: LG DU-42PX12X/12XC colour issue

    I split your post off as it's an entirely different TV.

    Most likely, the fault is not the coils -- it's more likely an issue with the voltages, or panel maldischarge which requires a firmware update to the control board.

    Pictures of the fault would help a lot.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      #3
      Re: LG DU-42PX12X/12XC colour issue

      Per your instructions, please see the photoa attached




      I hope I did this properly.
      The one photo with the fine lines is not as true as the other. The fine lines are a result of taking the photo off an operating display. My problem is the war the color doesn't "smooth" and looks loke a poster.
      Attached Files

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        #4
        Re: LG DU-42PX12X/12XC colour issue

        Does anyone have any idea on my problem after seeing the photos?

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          #5
          Re: LG DU-42PX12X/12XC colour issue

          As tom said you need to take the back off and take some voltages to see if they are in spec as printed on a sticker on the panel itself.

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            #6
            Re: LG DU-42PX12X/12XC colour issue

            Thanks.
            A little new to this. I did replace the one main board about 3 yrs ago, so I am no novice, I just haven't done test points on this one yet. I have the equipment though.
            My main question would really be, is a voltage adjustment (if there is any) going to take care of the problem? or another board replacement? I don't want to go through a bunch of things, and just end up needing a new TV
            Any thoughts?

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              #7
              Re: LG DU-42PX12X/12XC colour issue

              Check the voltages then run the internal test patterns. I don't think this is a panel fault if that's what you're asking.

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