Samsung QN75Q60TAF Boot Loop fixed but no picture

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  • lotas
    Badcaps Legend
    • Jan 2016
    • 4456
    • Russia

    #81
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    Originally posted by nomoresonys
    No Diah, not the mb, just maybe remove the other DT602 and see if the picture shows up, they are just like the diode packs that are going bad often, correct?
    This is TVS DIODE, they stand in the protection of the IC601 Spi Flash lines, and if there is no short on these lines, then they are more likely to be alive.

    And yet, did you have a short on the 3.3v line and the protection worked, after you removed the IC601, did you lose the short and did the TV turn on without rebooting?
    Last edited by lotas; 04-15-2023, 04:23 PM.

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12075
      • U.S.

      #82
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      Originally posted by lotas
      This is TVS DIODE, they stand in the protection of the IC601 Spi Flash lines, and if there is no short on these lines, then they are more likely to be alive.

      And yet, did you have a short on the 3.3v line and the protection worked, after you removed the IC601, did you lose the short and did the TV turn on without rebooting?
      Yes it did stop looping, post #60.

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4456
        • Russia

        #83
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        Well then, no programmer will help to read data from spi flash if it is short.

        Comment

        • Nicktronic
          Badcaps Veteran
          • Mar 2023
          • 247
          • Canada

          #84
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          Originally posted by lotas
          Well then, no programmer will help to read data from spi flash if it is short.
          I think Diah wants me to check and confirm IC601 is bad using the programmer

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6341
            • Germany

            #85
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            it still early to judge.. he need to put it on programmer then it will tell us its short or not... his value read are low to me,, but we need to be more sure..

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12075
              • U.S.

              #86
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              Originally posted by Nicktronic
              So would this include re-installing IC601 (if it's good) and then removing DT601/DT602? IC601 must be installed to provide VDD otherwise I'll never get a picture right?
              No, I would leave it out, don't remember how these are tested, I did see the datasheet somewhere tho.

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6341
                • Germany

                #87
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                Originally posted by Nicktronic
                I think Diah wants me to check and confirm IC601 is bad using the programmer
                did you order it with clip add ?? because clip much easy to use and good for future use

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12075
                  • U.S.

                  #88
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Thats the datasheet right?: https://cdn.badcaps-static.com/pdfs/...da9d31403c.pdf

                  Comment

                  • lotas
                    Badcaps Legend
                    • Jan 2016
                    • 4456
                    • Russia

                    #89
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    Originally posted by Diah
                    it still early to judge.. he need to put it on programmer then it will tell us its short or not... his value read are low to me,, but we need to be more sure..
                    So, what is there to guess, just measure the resistance between 4 and 8 pin., if there is a low resistance, then spi flash into the trash.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12075
                      • U.S.

                      #90
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      Oh, crap, I get it now, somehow I got it confused with those damn problematic diode packs from other samsung models.

                      Comment

                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6341
                        • Germany

                        #91
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        Originally posted by lotas
                        So, what is there to guess, just measure the resistance between 4 and 8 pin., if there is a low resistance, then spi flash into the trash.
                        of course not. this just belong to this threat and his issue.
                        at time he removed IC 601 no more reboot
                        measured pins 8 and 4 on chip where 4 on + and 8 on - read very low R. i don't know what are the really value to read.. this why we will use programmer help to tell us if this short or not.

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                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4456
                          • Russia

                          #92
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          So the programmer will not start and will not be able to read the data if there is a short on Vcc 3.3v for spi.

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6341
                            • Germany

                            #93
                            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                            Originally posted by lotas
                            So the programmer will not start and will not be able to read the data if there is a short on Vcc 3.3v for spi.
                            exactly... if the programmer failed we will have the answer.

                            Comment

                            • lotas
                              Badcaps Legend
                              • Jan 2016
                              • 4456
                              • Russia

                              #94
                              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                              It is possible to put a clean spi flash (empty, FF FF ...) for the experiment, that in some models they are without data (empty), in other models they already come with data.

                              Comment

                              • Diah
                                Badcaps Legend
                                • Feb 2013
                                • 6341
                                • Germany

                                #95
                                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                Originally posted by lotas
                                It is possible to put a clean spi flash (empty, FF FF ...) for the experiment, that in some models they are without data (empty), in other models they already come with data.
                                its better if he upload very clear photo of the chip area to see pins 123 67 where to go to understand the porpoise of DT601 / 602 and most important pin 6 SCLK so will find way to block the clock

                                Comment

                                • Nicktronic
                                  Badcaps Veteran
                                  • Mar 2023
                                  • 247
                                  • Canada

                                  #96
                                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                  Originally posted by Diah
                                  did you order it with clip add ?? because clip much easy to use and good for future use
                                  This is what i ordered;

                                  https://www.amazon.ca/gp/product/B07...?ie=UTF8&psc=1

                                  Comment

                                  • Nicktronic
                                    Badcaps Veteran
                                    • Mar 2023
                                    • 247
                                    • Canada

                                    #97
                                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                    Originally posted by Diah
                                    its better if he upload very clear photo of the chip area to see pins 123 67 where to go to understand the porpoise of DT601 / 602 and most important pin 6 SCLK so will find way to block the clock
                                    As requested...
                                    Attached Files

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12075
                                      • U.S.

                                      #98
                                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                      I grabbed the wrong data sheet, looks like it was for the 8 pin package not 6.
                                      Last edited by nomoresonys; 04-16-2023, 02:53 PM.

                                      Comment

                                      • Diah
                                        Badcaps Legend
                                        • Feb 2013
                                        • 6341
                                        • Germany

                                        #99
                                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                        Originally posted by Nicktronic
                                        As requested...
                                        check pin 6 of ic where it go .. did it had contact at any lvds socket

                                        Comment

                                        • lotas
                                          Badcaps Legend
                                          • Jan 2016
                                          • 4456
                                          • Russia

                                          #100
                                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                          All of these 6 pins go through the protection diodes and out to the control points.
                                          Attached Files

                                          Comment

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