Sharp LC-42D62U Bad Display

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  • deer
    Member
    • Oct 2012
    • 25
    • canada
    #1

    Sharp LC-42D62U Bad Display

    Our Sharp TV LC-42D62U has display issues ( please see pics.)
    I replaced the T Con board with a known good one with no improvement.
    Any comments as to how to proceed with repairing would be appreciated.
    Thank You in advance.

    Daniel
    Attached Files
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Sharp LC-42D62U Bad Display

      I note at least some of the noise is blurry.

      This almost always indicates it is present in the first decoding stage, which is on the main board. This happens before the video is scaled up, so when it is scaled, the noise gets stretched.

      I bet if you try with 720p/1080p source (depending on the resolution of the display), it will look different, if the source is the same as the native resolution, it may even disappear, apart from the stuck pixels.

      My guess -- bad RAM on the main board. May be possible to fix it yourself. Otherwise, buy a new main board.
      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.

        Comment

        • deer
          Member
          • Oct 2012
          • 25
          • canada
          #3
          Re: Sharp LC-42D62U Bad Display

          You were correct, replacing the main board fixed the problem.
          Thank You

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Sharp LC-42D62U Bad Display

              Glad you fixed it, thanks for the feedback…
              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.

                Comment

                • tanner
                  New Member
                  • Oct 2016
                  • 6
                  • USA
                  #5
                  Re: Sharp LC-42D62U Bad Display

                  I have a Sharp LC-42D62U and it SEEMS to have the same issues described above. I will try to attach some images, and give you some description. One day I turned it on and I saw a few "spots" on the screen. It reminded me of what I used to call "snow" on older TVs, but the spots were actually small lines of light color that were pretty stable in their size and position...until you cycle the power. Then the pattern would change. The picture has this problem no matter what input I choose, and when I click input I can see the problem in the window that appears. I have not had a chance to consult a professional repair shop, but from what I read above and on other posts, it sounds like it is NOT the T-con board, but more likely it is the main board. Agreed? (1st question) If so, it seems like my most economical way to go is to have a look at my board and look for one just like it on a site like Shopjimmy.com or Ebay. Agreed? (2nd question). Now for the final question. I have repaired a few laptops successfully, but a LCD TV is new territory for me. If I am grounded and take my time, is changing out the board relatively straight forward? Once done, is there any adjustment/calibration that needs to be done? Sorry if this is all basic stuff, but this is my only TV and really would hate to wait to save up for another one.
                  Sorry if I should have started a new thread, I am new to this forum and I could not see how to do that.
                  Attached Files

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6643
                      • Wales
                      #6
                      Re: Sharp LC-42D62U Bad Display

                      Looks very similar if not identical to the main board fault described above.
                      Willing to help but I'm no expert.

                        Comment

                        • garryls tv
                          New Member
                          • Jan 2017
                          • 7
                          • usa
                          #7
                          Re: Sharp LC-42D62U Bad Display

                          mine had lines also reworked main bd with heat worked

                            Comment

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