samsung un65nu6900f common problem, digging deeper

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  • lotas
    Badcaps Legend
    • Jan 2016
    • 4553
    • Russia

    #81
    Place a jumper between these points, disconnect the LVDS cable and check again that the voltage appears on VGH.
    Attached Files

    Comment

    • Cornito
      Senior Member
      • Jan 2024
      • 90
      • France

      #82
      What are these points?
      I'll try this and let you know.

      Thank you

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6357
        • Germany

        #83
        Originally posted by Cornito
        What are these points?
        I'll try this and let you know.

        Thank you
        don't do it,,, and don't buy mb too .... rubbish are rubbish and this was no 1 of fucking samsung rubbish tv

        Comment

        • Cornito
          Senior Member
          • Jan 2024
          • 90
          • France

          #84
          Diah you're best Samsung seller for ever and ever 😅

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6357
            • Germany

            #85
            Originally posted by Cornito
            Diah you're best Samsung seller for ever and ever 😅
            i had at home never forever Samsung TV come to home... Mobile was until Galaxy S5 and no more... cause their shit cheating start after that time.

            Comment

            • Cornito
              Senior Member
              • Jan 2024
              • 90
              • France

              #86
              @Iotas thank you, i works, i've soldered the jumper between these two points and my 25V is back and stable.
              Could you explain me why, I need to understand

              Do I need to connect LVDS cable now to see what is the behavior or do I need to perform other tests?

              Thank you

              Damien

              Comment

              • lotas
                Badcaps Legend
                • Jan 2016
                • 4553
                • Russia

                #87

                This says that you do not have a working panel, try masking (CKV...) on the non-working half, reduce the VGH power...
                Click image for larger version

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                Comment

                • Cornito
                  Senior Member
                  • Jan 2024
                  • 90
                  • France

                  #88
                  I'll try to reduce the VGH Power with the resistance addition.
                  The masking is not working for me.
                  Could you just let me know what are these PIN, and why the board react like that while we shunt these two.

                  Regards

                  Comment

                  • lotas
                    Badcaps Legend
                    • Jan 2016
                    • 4553
                    • Russia

                    #89
                    The jumper (FB_TRDY_1, FB_TRDY_3) simulates - as if we have a panel connected. When the LVDS cables are disconnected, the motherboard does not see the panel and blocks the supply voltage to the panel.

                    Comment

                    • Cornito
                      Senior Member
                      • Jan 2024
                      • 90
                      • France

                      #90
                      Ok then so, need to add the resistance between VGH and panel and test only when the jumper is removed

                      Comment

                      • Cornito
                        Senior Member
                        • Jan 2024
                        • 90
                        • France

                        #91
                        Using technics described into this videos i've been able to restart my TV:
                        https://youtu.be/kFINAT-Y204?feature=shared

                        Today i still face to some lines and bad colors, I need to reduce VGH voltages and rebuild some CK lines, but i'm moving forward.

                        I'll keep you up to date, i'll put a DC to DC to reduce the VGH voltages of the whole panel, just need to buy and receive these parts

                        Comment

                        • Cornito
                          Senior Member
                          • Jan 2024
                          • 90
                          • France

                          #92
                          Job is done, found a way a save it.
                          I'll add a step up DC dc to reduce VGH from 25 to 19v on whole panel.
                          Defective side has been reduced at 14v
                          Cuted ckv and grounded

                          Comment

                          • lotas
                            Badcaps Legend
                            • Jan 2016
                            • 4553
                            • Russia

                            #93
                            Everything is done correctly and the TV works.
                            Have you used this one?

                            Model: MT3608
                            Input voltage: 2 - 24 V
                            Output voltage: 5 - 28 V
                            Output current: 0 - 2 A​
                            Attached Files
                            Last edited by lotas; 01-24-2024, 03:24 PM.

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6357
                              • Germany

                              #94
                              Originally posted by lotas
                              Everything is done correctly and the TV works.
                              Have you used this one?

                              Model: MT3608
                              Input voltage: 2 - 24 V
                              Output voltage: 5 - 28 V
                              Output current: 0 - 2 A
                              i don't think this is the way...he did it with his brain way.... he wrote step up and he need to step down... so or so its just days to back for end... let him enjoy few hours

                              Comment

                              • Cornito
                                Senior Member
                                • Jan 2024
                                • 90
                                • France

                                #95
                                Originally posted by lotas
                                Everything is done correctly and the TV works.
                                Have you used this one?

                                Model: MT3608
                                Input voltage: 2 - 24 V
                                Output voltage: 5 - 28 V
                                Output current: 0 - 2 A​
                                Hello Iotas, nope I used nothing.
                                I've cutted the VGH line on the defective driver panel side and took the 14v from the caps just near and make the connection.

                                I've bought a DC to DC but the wrong one, step down don't work for me 'cause I guess the current consumption switch the main board DC dc into safe mode.

                                I'll buy a step up DC dc to take the incoming 12v and convert to 19V to preserve the panel.

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12104
                                  • U.S.

                                  #96
                                  Interesting, did you see a video of this technique?

                                  Comment

                                  • Cornito
                                    Senior Member
                                    • Jan 2024
                                    • 90
                                    • France

                                    #97
                                    Yep, the one linked in a previous post

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12104
                                      • U.S.

                                      #98
                                      Only link I see is post 91, can you post it here or the thread you found it in? Seems like you did the soldering in post 91 and something from another post, correct?

                                      Comment

                                      • Cornito
                                        Senior Member
                                        • Jan 2024
                                        • 90
                                        • France

                                        #99
                                        I've followed mostly the yt link posted in post#91.

                                        Just used other videos on the same chanel to have more confidence on action to perform.
                                        On one of his video he explained shortly how to tale the 14V on a cap close to the VGH line.

                                        I'll need to improve some solder and place the DC to DC Step down, so i'll be able to take some pictures to show you.

                                        Is there something that you would like to get in details?

                                        regards

                                        Comment

                                        • nomoresonys
                                          Badcaps Legend
                                          • Jan 2013
                                          • 12104
                                          • U.S.

                                          #100
                                          Was just wondering about procedure, I try to stay away from samsung as much as possible.

                                          Comment

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