Samsung QN75Q60TAF Boot Loop fixed but no picture

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  • Diah
    Badcaps Legend
    • Feb 2013
    • 6343
    • Germany

    #181
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    his problem not about boot loop as before... tv will turn on even if he remove both DT.. the questions there will be no picture... because t-con cut it off before removing the spi or the masking he did.
    i wish i am wrong for his sake.

    Comment

    • Nicktronic
      Badcaps Veteran
      • Mar 2023
      • 247
      • Canada

      #182
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      Originally posted by lotas
      Remove DT601 and DT602 and all of them are not needed, they cause more problems.
      After removal, check to turn on the TV without spi and 601, 602.
      Ok, I will try that

      Comment

      • Nicktronic
        Badcaps Veteran
        • Mar 2023
        • 247
        • Canada

        #183
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        Originally posted by Diah
        his problem not about boot loop as before... tv will turn on even if he remove both DT.. the questions there will be no picture... because t-con cut it off before removing the spi or the masking he did.
        i wish i am wrong for his sake.
        @diah, it's ok, and I thank you for all the help, do you think the panel is causing the problem and therefore the TV is garbage/recycle?

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6343
          • Germany

          #184
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          Originally posted by Nicktronic
          @diah, it's ok, and I thank you for all the help, do you think the panel is causing the problem and therefore the TV is garbage/recycle?
          you placed order for new SPI and DT.. change them as they both low coast.
          who knows.. maybe there will be wounder !!!
          Last edited by Diah; 04-21-2023, 11:19 AM.

          Comment

          • Nicktronic
            Badcaps Veteran
            • Mar 2023
            • 247
            • Canada

            #185
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            Originally posted by Diah
            you placed order for new SPI and DT.. change them as they both low coast.
            who knows.. maybe there will be wounder !!!
            Haha, maybe!

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6343
              • Germany

              #186
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              Originally posted by Nicktronic
              Haha, maybe!
              do it as lotas suggest to remove both DT.... maybe this is the wounder you are waiting for... you will not lost anythings.

              Comment

              • Nicktronic
                Badcaps Veteran
                • Mar 2023
                • 247
                • Canada

                #187
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                Originally posted by lotas
                Remove DT601 and DT602 and all of them are not needed, they cause more problems.
                After removal, check to turn on the TV without spi and 601, 602.
                No difference, boots up, samsung jingle, backlights on, no picture

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4458
                  • Russia

                  #188
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Now you need to solder a clean spi flash and check with it.

                  Comment

                  • Nicktronic
                    Badcaps Veteran
                    • Mar 2023
                    • 247
                    • Canada

                    #189
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    Originally posted by lotas
                    Now you need to solder a clean spi flash and check with it.
                    Once I receive it, I will. I ordered new diode packs as well.

                    Comment

                    • Nicktronic
                      Badcaps Veteran
                      • Mar 2023
                      • 247
                      • Canada

                      #190
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      Installed both the new SPI flash and the diode packs. Same result. I'm done with this TV, it's going to the recycling depot.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12076
                        • U.S.

                        #191
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        Well it was not a success BUT it's a damn interesting thread with some good info in it.

                        Comment

                        • Nicktronic
                          Badcaps Veteran
                          • Mar 2023
                          • 247
                          • Canada

                          #192
                          Originally posted by lotas
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          Wiring Diagram
                          Hey again, I have another Q60TAF (70" this time) and I've confirmed that if I isolate the any ONE of the following pins, the TV will stop boot looping (but still doesn't show a picture). I've found no shorted caps on the buffer boards. Pins 1, 11, 22, 28 and 82. Based on the wiring diagram of CN1300, which of these pins is critical to allowing a picture to show on screen?

                          Comment

                          • Nicktronic
                            Badcaps Veteran
                            • Mar 2023
                            • 247
                            • Canada

                            #193
                            Wiring diagram...
                            Attached Files

                            Comment

                            • Hendrink
                              New Member
                              • Nov 2023
                              • 3
                              • Japan

                              #194
                              I also have the Boot Loop issue with this exact same TV, the QN75Q60TAF. After reading through this forum and the "SAMSUNG UN50TU8000F rebooting, backlight ok. No 12v to panel boards" forum, I got the TV to turn on with image and everything, but a bunch a reddish horizontal lines display on the screen. The lines are not too noticeable, but they still affect the quality of the image.

                              I was able to fix the Boot Loop by masking pins 7-8 on the flex cable that connects to the right side buffer board, but I can't get rid of those reddish horizontal lines on the display. I have tried checking all the caps with a multimeter, I have tried injecting voltage into the board to find a short, and I have tried to follow the rails to find the issue. Unfortunately, I haven't been successful.

                              I would also like to mention that I don't have a lot of experience troubleshooting electronics, but I have a solid foundation in electrical systems. I have also tried to find the schematic for this TV, but I have been unsuccessful.

                              Any information that helps me solve this problem would be greatly appreciated.
                              Attached Files

                              Comment

                              • Diah
                                Badcaps Legend
                                • Feb 2013
                                • 6343
                                • Germany

                                #195
                                Originally posted by Hendrink
                                I was able to fix the Boot Loop by masking pins 7-8 on the flex cable that connects to the right
                                Any information that helps me solve this problem would be greatly appreciated.
                                did you trace the pins 7,8 where they go... to the end of buffer boards.. there may ESD diode shorted

                                also with out this U ribbon cable you will have 3/4 screen... did the line remain showing or disappear
                                Last edited by Diah; 04-20-2024, 04:31 AM.

                                Comment

                                • Hendrink
                                  New Member
                                  • Nov 2023
                                  • 3
                                  • Japan

                                  #196
                                  Originally posted by Diah

                                  did you trace the pins 7,8 where they go... to the end of buffer boards.. there may ESD diode shorted

                                  also with out this U ribbon cable you will have 3/4 screen... did the line remain showing or disappear
                                  I was able to isolate the issue down to pin 7 specifically, and I was able to trace it down to a 56-ohms resistor at the end of the buffer board. You can see the resistor in the picture attached marked with red, and pin 7 is connected to the side pointed by the arrow. I checked ohms across the resistor and it reads good.

                                  I tried to find where the other side of the resistor led, but I wasn't successful. Also, I did as suggested and disconnected the U ribbon cable, and the lines disappeared that time.

                                  I am not sure if I should try to re-flow/replace that resistor, or go down another route. Thanks for the suggestions.
                                  Attached Files

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6343
                                    • Germany

                                    #197
                                    Originally posted by Hendrink

                                    I was able to isolate the issue down to pin 7 specifically, and I was able to trace it down to a 56-ohms resistor at the end of the buffer board. You can see the resistor in the picture attached marked with red, and pin 7 is connected to the side pointed by the arrow. I checked ohms across the resistor and it reads good.

                                    I tried to find where the other side of the resistor led, but I wasn't successful. Also, I did as suggested and disconnected the U ribbon cable, and the lines disappeared that time.

                                    I am not sure if I should try to re-flow/replace that resistor, or go down another route. Thanks for the suggestions.
                                    the other end of the R going to the gate Transistor in display which it seem shorted as know issue with this model.
                                    but i would suggest trying to remove yours mask on the U ribbon cable.. and just release one legs of this R then see if the screen come clean.

                                    Comment

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