Sharp Aquos LC-37G4U LCD Distortion

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  • electech
    New Member
    • Mar 2010
    • 5

    #1

    Sharp Aquos LC-37G4U LCD Distortion

    I have a 37" sharp LCD with a image problem. The right half of the picture is fine. The left side has distorted colors (washed out and dark). The images on the left side do not refresh at a normal rate (I.e., when a picture is supposed to diasppear the image slowly fades).

    I suspect that the LCD controller (T-Con) board is bad. There are two flex connectors that I suspect controls each side of the picture. Next task is to clean and reseat the connectors.

    I was going to buy and study the Sharp service manual. But I thought someone has any experince with this type of problem??

    Is there a possibility that the LCD screen itself is defective??

    Electech
  • Wizard
    Badcaps Legend
    • Mar 2008
    • 2296

    #2
    Re: Sharp Aquos LC-37G4U LCD Distortion

    You are correct, but connections is rarely the problem. Find and order a T-CON.

    Cheers, Wizard

    Comment

    • electech
      New Member
      • Mar 2010
      • 5

      #3
      Re: Sharp Aquos LC-37G4U LCD Distortion

      Thanks Wizard!

      You are a Pro and will do what you suggest. I have been reading your other posts and your recommendations have been very good.

      BTW. I am a Newbie to LCD/Plasma repair but have extensive background in repairing electronics of all other types over the years.

      Electech

      Comment

      • electech
        New Member
        • Mar 2010
        • 5

        #4
        Re: Sharp Aquos LC-37G4U LCD Distortion

        I replaced the T-Conn board and got exactly the same problem. Does not appear to be a T-Conn problem. Is it possible to investigate this a little further to isolate to LCD screen??

        I now have the service manual with schematics for the TV monitor.

        Comment

        • el3ctroded
          Senior Member
          • Nov 2008
          • 198
          • USA

          #5
          Re: Sharp Aquos LC-37G4U LCD Distortion

          Does it do the same thing using different inputs?

          Comment

          • electech
            New Member
            • Mar 2010
            • 5

            #6
            Re: Sharp Aquos LC-37G4U LCD Distortion

            It is not a function of the input. The display anamoly is present with all inputs (I.e., TV tuner and DVD inputs). The OSD also appears to have the distortion as well. Only the left half of the screen is affected.

            Comment

            • el3ctroded
              Senior Member
              • Nov 2008
              • 198
              • USA

              #7
              Re: Sharp Aquos LC-37G4U LCD Distortion

              It still could be main board... Or damaged flex cable. Or panel.

              Comment

              • electech
                New Member
                • Mar 2010
                • 5

                #8
                Re: Sharp Aquos LC-37G4U LCD Distortion

                I checked the contiuity of the all flex cables between main board to T-Conn to Panel. Since I have a schematic I will try to probe the lines. It may give me a clue as to where the defect is located.

                Comment

                • C64
                  New Member
                  • Nov 2010
                  • 1

                  #9
                  Re: Sharp Aquos LC-37G4U LCD Distortion

                  Did you ever find a solution to this issue?

                  Comment

                  • Wizard
                    Badcaps Legend
                    • Mar 2008
                    • 2296

                    #10
                    Re: Sharp Aquos LC-37G4U LCD Distortion

                    You cannot probe. The data rate is very high between mainboard and the logic board.

                    Like I said, you cannot determine the waveforms that is good from bad with LVDS data and this requires 200-500MHz scope. Even my 100MHz can not resolve this.

                    It is not the panel faulty. Data is rendered in the mainboard and sent to the logic board which analyzes the information and steers the Y buffers and X buffers lines and send data on amount of pixel intensity to both YSUS and ZSUS boards. This for just one subpixel of red. Do the same for green then blue then next pixel groups. And go fast enough to keep flicker down.

                    The noisy look is what I have previously said before, change either logic board or the mainboard. I'd do the logic board first.

                    Cheers, Wizard

                    Comment

                    • truep
                      Badcaps Veteran
                      • Aug 2010
                      • 373
                      • USA

                      #11
                      Re: Sharp Aquos LC-37G4U LCD Distortion

                      You may have a bad LCD. Ive seen similar problems on 2 sony's and it was the panel itself.

                      Comment

                      • mbates14
                        Senior Member
                        • May 2005
                        • 169

                        #12
                        Re: Sharp Aquos LC-37G4U LCD Distortion

                        and if thats the case, then it might as well be a cracked panel. serves no difference.

                        Comment

                        • Myers
                          New Member
                          • Sep 2012
                          • 6
                          • USA

                          #13
                          Re: Sharp Aquos LC-37G4U LCD Distortion

                          buffer in the panel
                          that's my 2 cents

                          Comment

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