Samsung QN75Q60TAF Boot Loop fixed but no picture

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  • Nicktronic
    Badcaps Veteran
    • Mar 2023
    • 247
    • Canada

    #141
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    I found the SPI Flash, so will try to check with programmer tomorrow.

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6343
      • Germany

      #142
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      you need to find out PIN 5 DT602 where its go.. from photo cant follow it because the boards sandwich one. if it goes to cap you need to do check of it same way in reserve to find out the slow discharge.

      Comment

      • Nicktronic
        Badcaps Veteran
        • Mar 2023
        • 247
        • Canada

        #143
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        Originally posted by Diah
        you need to find out PIN 5 DT602 where its go.. from photo cant follow it because the boards sandwich one. if it goes to cap you need to do check of it same way in reserve to find out the slow discharge.
        Ok, will do

        Comment

        • Nicktronic
          Badcaps Veteran
          • Mar 2023
          • 247
          • Canada

          #144
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          I got the CH341 programmer, did the 3.3V mod and soldered the SPI Flash to the daughter board. I downloaded and installed the drivers for the CH341. I tried using Neo Programmer software but GD25B32CSIG was not in their list and auto detect did not work.

          Does anybody have a suggestion of what program to use with the CH341?

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6343
            • Germany

            #145
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            use this auto detect


            or this in attachment... GIGADEVICE your chip
            Attached Files
            Last edited by Diah; 04-19-2023, 01:12 PM.

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4458
              • Russia

              #146
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              Originally posted by Nicktronic
              I got the CH341 programmer, did the 3.3V mod and soldered the SPI Flash to the daughter board. I downloaded and installed the drivers for the CH341. I tried using Neo Programmer software but GD25B32CSIG was not in their list and auto detect did not work.

              Does anybody have a suggestion of what program to use with the CH341?
              If the Spi Flash chip is short, then not one programmer, not one program will detect it.

              Comment

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

                #147
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                So, did you order the new spi? looks like the quicker you get a new one the quicker you can get on with the repair attempt.
                Last edited by nomoresonys; 04-19-2023, 02:04 PM.

                Comment

                • Nicktronic
                  Badcaps Veteran
                  • Mar 2023
                  • 247
                  • Canada

                  #148
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Originally posted by nomoresonys
                  So, did you order the new spi? looks like the quicker you get a new one the quicker you can get on with the repair attempt.
                  Yes, I ordered a new one.

                  Comment

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

                    #149
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    Ok, excellent, now you can experiment with the old one, looks like these guys have lots of suggestions for further testing.

                    Comment

                    • Nicktronic
                      Badcaps Veteran
                      • Mar 2023
                      • 247
                      • Canada

                      #150
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      Originally posted by Diah
                      use this auto detect


                      or this in attachment... GIGADEVICE your chip
                      Tried with your program, still nothing but I want you to confirm I have the CH341 configured properly. I received a jumper that I did not use.
                      Attached Files

                      Comment

                      • lotas
                        Badcaps Legend
                        • Jan 2016
                        • 4458
                        • Russia

                        #151
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        The program does not see your programmer, if the chip is short, as I already wrote, then it shortens the power supply of the programmer, remove the chip and start the program again.
                        Attached Files

                        Comment

                        • Nicktronic
                          Badcaps Veteran
                          • Mar 2023
                          • 247
                          • Canada

                          #152
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          Originally posted by lotas
                          The program does not see your programmer, if the chip is short, as I already wrote, then it shortens the power supply of the programmer, remove the chip and start the program again.
                          Ah, I see, thanks

                          Comment

                          • Nicktronic
                            Badcaps Veteran
                            • Mar 2023
                            • 247
                            • Canada

                            #153
                            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                            Originally posted by Diah
                            you need to find out PIN 5 DT602 where its go.. from photo cant follow it because the boards sandwich one. if it goes to cap you need to do check of it same way in reserve to find out the slow discharge.
                            I checked every pin, cap, solder pad, test point etc on the board with LVDS and U cables removed and could not find a connection to anything from DT601 pin 5 and DT602 pin 5. Is it possible they are not used?

                            Comment

                            • Nicktronic
                              Badcaps Veteran
                              • Mar 2023
                              • 247
                              • Canada

                              #154
                              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                              Originally posted by lotas
                              The program does not see your programmer, if the chip is short, as I already wrote, then it shortens the power supply of the programmer, remove the chip and start the program again.
                              Same message with spi flash removed. No connect. I want know if the CH341 is configured properly....do i need to use the jumper? There are no instructions
                              Last edited by Nicktronic; 04-19-2023, 04:28 PM. Reason: added question

                              Comment

                              • Nicktronic
                                Badcaps Veteran
                                • Mar 2023
                                • 247
                                • Canada

                                #155
                                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                See in neo programmer, with SPI Flash removed and just the CH341 plugged in, it says cannot connect to CH341 and I don't know why.
                                Attached Files

                                Comment

                                • lotas
                                  Badcaps Legend
                                  • Jan 2016
                                  • 4458
                                  • Russia

                                  #156
                                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                  Originally posted by Nicktronic
                                  See in neo programmer, with SPI Flash removed and just the CH341 plugged in, it says cannot connect to CH341 and I don't know why.
                                  The drivers were installed correctly, it is determined in the device manager, the jumper is not needed here, it is for 5v.

                                  Comment

                                  • Nicktronic
                                    Badcaps Veteran
                                    • Mar 2023
                                    • 247
                                    • Canada

                                    #157
                                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                    Originally posted by lotas
                                    The drivers were installed correctly, it is determined in the device manager, the jumper is not needed here, it is for 5v.
                                    Ok, I aslo did this mod; lift pin 28 of ch341 and jumper to 3.3V tab of regulator and also jumper to pin 9 of ch341. Should i have done this? I'm reading information now that says it was wrong to do that.

                                    Comment

                                    • Nicktronic
                                      Badcaps Veteran
                                      • Mar 2023
                                      • 247
                                      • Canada

                                      #158
                                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                      Originally posted by lotas
                                      The drivers were installed correctly, it is determined in the device manager, the jumper is not needed here, it is for 5v.
                                      Yes, drivers installed correctly

                                      Comment

                                      • lotas
                                        Badcaps Legend
                                        • Jan 2016
                                        • 4458
                                        • Russia

                                        #159
                                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                        it is determined in the device manager

                                        Comment

                                        • lotas
                                          Badcaps Legend
                                          • Jan 2016
                                          • 4458
                                          • Russia

                                          #160
                                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                          Originally posted by Nicktronic
                                          Ok, I aslo did this mod; lift pin 28 of ch341 and jumper to 3.3V tab of regulator and also jumper to pin 9 of ch341. Should i have done this? I'm reading information now that says it was wrong to do that.
                                          !!! DO NOT CONNECT 3.3V TO PIN 9 OF CH341 otherwise the CH341 will burn in 5.0v selection. !!!

                                          Did you install a jumper when setting 9 pin to 3.3v?
                                          Last edited by lotas; 04-19-2023, 05:17 PM.

                                          Comment

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