Samsung UE40C6620 LED LCD Discolouration

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  • 2407cap
    Member
    • Mar 2012
    • 13
    • UK
    #1

    Samsung UE40C6620 LED LCD Discolouration

    Hi all,

    Having an issue with a Samsung UE40C6620. Unit was purchased new in 2010. It's a 40" LED LCD model, UK spec.

    A few months ago an intermittent fault appeared. The defect is hard to describe, but is shown in the attached images. When the fault appears, a quarter of the screen is discoloured with waves of blue pixels.

    The issue affects all inputs. It is intermittent, so for extended periods over the last few months it has gone away and the image has been perfect.

    It appears to be an issue with the blue channel in that section of the screen; when I pull up RGB test videos, there is no issue showing a full red or green screen.

    Have opened up the back, and tried removing and cleaning the connectors on the LVDS (?) cable from the main board to the T-Con (I hope I'm using the right terminology!) to no avail.

    I can see there are more ribbon connectors below the T-Con, but these are taped down and difficult to reach.

    Any thoughts on what might be the problem here?

    Hi res images of the issue and electrical boards attached.

    Thanks in advance.
    Attached Files
    Tags: None
    • 2407cap
      Member
      • Mar 2012
      • 13
      • UK
      #2
      Re: Samsung UE40C6620 LED LCD Discolouration

      Any thoughts on this?

      Have done a fair bit of searching and can't find any comparable cases on this forum or elsewhere.

        Comment

        • sordids999
          Badcaps Legend
          • May 2013
          • 2149
          • uk
          #3
          Re: Samsung UE40C6620 LED LCD Discolouration

          Try gently pressing on these connections (try the corners as well)with a screwdriver but the handle end
          i have had this issue before with a UE samsung where the BGA solder went bad or even try gently warming it up with a hair dryer
          just an idea !
          Attached Files
          Last edited by sordids999; 01-01-2016, 08:27 AM.

            Comment

            • sordids999
              Badcaps Legend
              • May 2013
              • 2149
              • uk
              #4
              Re: Samsung UE40C6620 LED LCD Discolouration

              https://www.youtube.com/watch?v=EPc68dc5pZM

              Also watch this
              Last edited by sordids999; 01-01-2016, 08:36 AM.

                Comment

                • 2407cap
                  Member
                  • Mar 2012
                  • 13
                  • UK
                  #5
                  Re: Samsung UE40C6620 LED LCD Discolouration

                  Thanks for the pointer, but no luck.

                  What puzzles me about this (as opposed to other cases I've seen, like the one you linked) is that it is affects exactly a quarter of the display; the other three quarters are perfect.

                  Could this be symptomatic of a T-Con issue, or do you think the panel toast?

                    Comment

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