Samsung ue58tu7100

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  • thuss
    Badcaps Veteran
    • Jul 2012
    • 317
    • uk

    #1

    Samsung ue58tu7100

    My mates samsung tv. Symptoms are backlights flash then switch off.

    Some times it displays an image which fades. Suspect a bad panel.

    Disconnected main board from psu and the backlights stayed on.
    Reconnected everything. Then Disconnected the ribbon from main board to panel -backlights stayed on with sound but no image.

    I suspect it's the panel and maybe the following chip on the panel. AAT7212 which I've attached a photo of (not very clear).

    I've searched for a AAT7212 datasheet but couldn't find one.

    In the attached photo leg 3 and leg 8 are reading short highlighted by red lines.

    But Im possibly wrong just wondering if anyone has come across this and I would be grateful for any help/advice.
    Attached Files
  • alfatv
    Badcaps Veteran
    • Sep 2020
    • 353
    • Canada

    #2
    Re: Samsung ue58tu7100

    Leave that chip alone.
    Search this forum for un58tu* and un50tu*, panel issue.

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12144
      • U.S.

      #3
      Re: Samsung ue58tu7100

      start with an easy test, test the little mlc caps on the long thin panel driver boards, check them for shorts or very low ohms.

      Comment

      • thuss
        Badcaps Veteran
        • Jul 2012
        • 317
        • uk

        #4
        Re: Samsung ue58tu7100

        Originally posted by nomoresonys
        start with an easy test, test the little mlc caps on the long thin panel driver boards, check them for shorts or very low ohms.
        Happy New to all.

        Checked all those little caps no apparent short or low ohms.

        individually disconneced the two ribbons that attach to the screen . Get pixalation on the screen when one ribbon/tab is removed but when both are attached tv just keeps trying to boot up but no image.

        On the main board side the large ribbon(lower side of main board) I've tried putting a little tape between 7 and 12- which results in a the tv staying on with sound but no image but a lot of horizontal lines.


        Maybe it's just to far gone?

        Comment

        • thuss
          Badcaps Veteran
          • Jul 2012
          • 317
          • uk

          #5
          Re: Samsung ue58tu7100

          I've just double checked the panel boards and found two caps which I have highlighted that are charging up with a multimeter. the ones I have come across never do that.

          I've tried masking pin 12 to 20 no luck . Then masking pin 13 the screen displayed lines in both directions.
          Attached Files

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12144
            • U.S.

            #6
            Re: Samsung ue58tu7100

            so the other caps nearby are not doing the same?

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12144
              • U.S.

              #7
              Re: Samsung ue58tu7100

              so what do you have with just one ribbon cable attached, is the red light lit on the optical out port of the mainboard? careful not to let the pins of the disconnected ribbon cable touch the metal chassis or anything.
              Last edited by nomoresonys; 01-01-2023, 06:05 PM.

              Comment

              • thuss
                Badcaps Veteran
                • Jul 2012
                • 317
                • uk

                #8
                Re: Samsung ue58tu7100

                Originally posted by nomoresonys
                so what do you have with just one ribbon cable attached, is the red light lit on the optical out port of the mainboard? careful not to let the pins of the disconnected ribbon cable touch the metal chassis or anything.
                Hi In regards to your first reply only those two caps but I don't regard them as faulty.


                Yes the optical port is on.

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12144
                  • U.S.

                  #9
                  Re: Samsung ue58tu7100

                  just set meter to ohms, if its not auto-ranging meter you may need to play with the range 2000k, 200k, 20k, 2000, etc, what is the ohm reading on those two caps and the others there in that area that are the same physical size?

                  Comment

                  • thuss
                    Badcaps Veteran
                    • Jul 2012
                    • 317
                    • uk

                    #10
                    Re: Samsung ue58tu7100

                    Originally posted by nomoresonys
                    just set meter to ohms, if its not auto-ranging meter you may need to play with the range 2000k, 200k, 20k, 2000, etc, what is the ohm reading on those two caps and the others there in that area that are the same physical size?
                    It's a autoranging meter. The caps are reading similar to the others, initially i think I wasnt being careful with the meter probes.
                    Last edited by thuss; 01-02-2023, 08:00 AM.

                    Comment

                    • thuss
                      Badcaps Veteran
                      • Jul 2012
                      • 317
                      • uk

                      #11
                      Re: Samsung ue58tu7100

                      Originally posted by nomoresonys
                      just set meter to ohms, if its not auto-ranging meter you may need to play with the range 2000k, 200k, 20k, 2000, etc, what is the ohm reading on those two caps and the others there in that area that are the same physical size?


                      Yes it's a autoranging meter. The caps are reading similar to others. I think initially I wasnt being careful with the probes.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12144
                        • U.S.

                        #12
                        Re: Samsung ue58tu7100

                        ok, they seem alright, now my memory isn't the greatest but I thought I saw someone on youtube doing the tape-cutoff method on a tv with no stand alone tcon and only one ribbon cable like yours has there, maybe try that, see if you can get a good image. I like this guys method he's using here, yes I realize that the one he's working on has 2 cables: https://www.youtube.com/watch?v=pfrRhw7-ZII

                        Comment

                        • thuss
                          Badcaps Veteran
                          • Jul 2012
                          • 317
                          • uk

                          #13
                          Re: Samsung ue58tu7100

                          Originally posted by nomoresonys
                          ok, they seem alright, now my memory isn't the greatest but I thought I saw someone on youtube doing the tape-cutoff method on a tv with no stand alone tcon and only one ribbon cable like yours has there, maybe try that, see if you can get a good image. I like this guys method he's using here, yes I realize that the one he's working on has 2 cables: https://www.youtube.com/watch?v=pfrRhw7-ZII
                          Yes I saw that video -will try it again. Thanks for your help

                          Comment

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