Sony KDL-50W685A horizontal black lines Pattern

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  • Raulnn
    Senior Member
    • Nov 2022
    • 103
    • España

    #21
    Originally posted by lotas

    Check the fuse on the t-con and see if there is any voltage on the t-con.
    I think the LVDS cable is fine. The tcon receives 12v from the fuse, even in the sub-sources there is voltage. I can see the 3.3v power supply from the dc dc converter

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6371
      • Germany

      #22
      remove the bezel and inspect the screen side glass if there any damage

      Comment

      • Raulnn
        Senior Member
        • Nov 2022
        • 103
        • España

        #23
        Originally posted by Diah
        remove the bezel and inspect the screen side glass if there any damage
        Thanks! No. I have disassembled the frame and it is perfect. The problem is with the tcon, DC DC converter area, but I don't know how to test if the converter is okay. the converter gets hot, the 3.3v and 1.7v test points are fine.

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6371
          • Germany

          #24
          Originally posted by Raulnn

          Thanks! No. I have disassembled the frame and it is perfect. The problem is with the tcon, DC DC converter area, but I don't know how to test if the converter is okay. the converter gets hot, the 3.3v and 1.7v test points are fine.
          show here photo of the circuit you mentioned and mark on it the part u said it get hot

          Comment

          • Raulnn
            Senior Member
            • Nov 2022
            • 103
            • España

            #25
            Originally posted by Diah

            show here photo of the circuit you mentioned and mark on it the part u said it get hot
            hello! In the photo there are several voltage reference points AVDD, VGL, VSS. these give incorrect values. however, the 1.2v and 3.3v benchmarks are correct. The supply voltage of that integrated is correct. I don't know if the problem is with that integrated part or with another component of that circuit.

            Comment

            • Raulnn
              Senior Member
              • Nov 2022
              • 103
              • España

              #26
              Can you help me? I don't know how to differentiate a problem in the DC DC converter, or in some nearby capacitor. the converter is very hot

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6371
                • Germany

                #27
                Originally posted by Raulnn
                Can you help me? I don't know how to differentiate a problem in the DC DC converter, or in some nearby capacitor. the converter is very hot
                this is non DC /DC... contact AUO in Taiwan and give them the last photo you uploaded--- they will send you free of charge 8 ribbon set of COF need to replace... but you need to have 6000 euro coast of COF install machine.

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4598
                  • Russia

                  #28
                  Check the resistance of test points CKM1-CKM6 at the output of this chip relative to ground.
                  Attached Files

                  Comment

                  • Raulnn
                    Senior Member
                    • Nov 2022
                    • 103
                    • España

                    #29
                    Originally posted by lotas
                    Check the resistance of test points CKM1-CKM6 at the output of this chip relative to ground.
                    Thanks. I have measured at the test point with a black ground terminal.

                    CKM1: 83,5 Kohms
                    CKM2: 1,8 Mohms
                    ​​​​​​​CKM3: 1,8 Mohms
                    ​​​​​​​CKM4: 1,6 Mohms
                    ​​​​​​​CKM5: 1,6 Mohms
                    ​​​​​​​​​​​​​​CKM6: 1,6 Mohms

                    Comment

                    • Raulnn
                      Senior Member
                      • Nov 2022
                      • 103
                      • España

                      #30
                      Originally posted by Diah

                      this is non DC /DC... contact AUO in Taiwan and give them the last photo you uploaded--- they will send you free of charge 8 ribbon set of COF need to replace... but you need to have 6000 euro coast of COF install machine.
                      thank you. I hope you are wrong 😁😅😭

                      Comment

                      • Raulnn
                        Senior Member
                        • Nov 2022
                        • 103
                        • España

                        #31
                        riddle solved. A flex where the integrated hood is located is damaged. Someone did a bad job and ruined it.

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6371
                          • Germany

                          #32
                          Originally posted by Raulnn
                          riddle solved. A flex where the integrated hood is located is damaged. Someone did a bad job and ruined it.
                          thus you call it flex.... its the COF which Taiwan could send to you free of charge

                          Comment

                          • Raulnn
                            Senior Member
                            • Nov 2022
                            • 103
                            • España

                            #33
                            Originally posted by Diah

                            thus you call it flex.... its the COF which Taiwan could send to you free of charge
                            It's not the cof, look at the damage. but your hypothesis was the right one, because the fault is in the housing cof 😁
                            Attached Files

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6371
                              • Germany

                              #34
                              Originally posted by Raulnn

                              It's not the cof, look at the damage. but your hypothesis was the right one, because the fault is in the housing cof 😁
                              because of the COF overload can also burn the lines on flex

                              Comment

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