Samsung QN75Q60TAF Boot Loop fixed but no picture

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  • Nicktronic
    Badcaps Veteran
    • Mar 2023
    • 247
    • Canada

    #161
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    Originally posted by lotas
    !!! 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?
    Yup, as the many sites and videos said to do. Crappy, so what does that mean? It will output 5 V to VCC of the SPI flash?

    Comment

    • lotas
      Badcaps Legend
      • Jan 2016
      • 4452
      • Russia

      #162
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      Without a jumper it gives out 3.3v (for spi flash), with a jumper it gives out 5v (for eeprom 24Cxxx), but if you make a mod (with 9 pin, only for spi, then it is absolutely impossible to put a jumper). 5v then goes to 9 pin and that's it - the chip itself burns out.
      It was necessary to do the mod only with power at 3.3v without a jumper for 9 pin.
      Last edited by lotas; 04-19-2023, 06:19 PM.

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6336
        • Germany

        #163
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        1- yours jumper the red wire enough don't do any more
        2- use the program i later attached at my post #145
        3- be sure the PCB of the chip sitting on the programmer pin 1 on 1

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6336
          • Germany

          #164
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          yours photo

          you should put the yellow jumper clip on pin 1 & 2 this is programmer.... and if you want to use the adapter as serial for log dump the jumper need to be at pin 2 & 3
          Attached Files
          Last edited by Diah; 04-19-2023, 07:01 PM.

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6336
            • Germany

            #165
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            Originally posted by Nicktronic
            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?
            U ribbon you mean..... if yes... this ribbon should be connected so because the board sandwich, it may the pins go to end corner of the display.

            Comment

            • Nicktronic
              Badcaps Veteran
              • Mar 2023
              • 247
              • Canada

              #166
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              Originally posted by Diah
              U ribbon you mean..... if yes... this ribbon should be connected so because the board sandwich, it may the pins go to end corner of the display.
              Yes, I understand but I checked DT601/DT602 pin 5 to all the pins of connector of the U ribbon at each end of the board.

              Comment

              • Nicktronic
                Badcaps Veteran
                • Mar 2023
                • 247
                • Canada

                #167
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                Hmmm, @diah says use the jumper, @lotas says do not use the jumper lol. What do i do!?? At this point, I've tried all combinations and no luck. SPI is likely dead and if @lotas is right, the CH341 is dead. :S

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6336
                  • Germany

                  #168
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Originally posted by Nicktronic
                  Hmmm, @diah says use the jumper, @lotas says do not use the jumper lol. What do i do!?? At this point, I've tried all combinations and no luck. SPI is likely dead and if @lotas is right, the CH341 is dead. :S
                  lotas talking on pin 9 of the IC dont connect it to 3.3V as some idiot on internet say... and he is correct dont .. just the red wire you did enough.

                  i am talking on jumper pins 123 .... take look downside its printed pin 1-2 programmer pin 2-3 TTL also you need to short pin 1-2 with jumper

                  Comment

                  • Nicktronic
                    Badcaps Veteran
                    • Mar 2023
                    • 247
                    • Canada

                    #169
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    Originally posted by Diah
                    lotas talking on pin 9 of the IC dont connect it to 3.3V as some idiot on internet say... and he is correct dont .. just the red wire you did enough.

                    i am talking on jumper pins 123 .... take look downside its printed pin 1-2 programmer pin 2-3 TTL also you need to short pin 1-2 with jumper
                    ah ok, thanks

                    Comment

                    • Nicktronic
                      Badcaps Veteran
                      • Mar 2023
                      • 247
                      • Canada

                      #170
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      So I bought another CH341A just in case i bricked the one i have like @lotas suggested.

                      Now, when I get the new one, DO I NEED TO DO THE MOD (lift pin 28 of CH341 and run mod wire from pin 28 to the middle pin of 3.3V regulator)? From the datasheet of the SPI, I see it cannot handle 5V.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12074
                        • U.S.

                        #171
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        .
                        Last edited by nomoresonys; 04-20-2023, 03:48 PM.

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12074
                          • U.S.

                          #172
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          CH341 has both 3.3 and 5v.: https://www.ebay.com/sch/i.html?_fro...volt&_osacat=0

                          Comment

                          • lotas
                            Badcaps Legend
                            • Jan 2016
                            • 4452
                            • Russia

                            #173
                            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                            Originally posted by Nicktronic
                            So I bought another CH341A just in case i bricked the one i have like @lotas suggested.

                            Now, when I get the new one, DO I NEED TO DO THE MOD (lift pin 28 of CH341 and run mod wire from pin 28 to the middle pin of 3.3V regulator)? From the datasheet of the SPI, I see it cannot handle 5V.
                            Yes, it's better to make this mod, because the chip itself will already be powered not by 5v, but by 3.3v and, accordingly, the signal lines between spi will also be at 3.3v, this is with a green board programmer CH341A (old revision) mod does not need to be done, everything is fine there , but it is better to make a programmer with a black board.

                            Comment

                            • lotas
                              Badcaps Legend
                              • Jan 2016
                              • 4452
                              • Russia

                              #174
                              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                              For such a "green" mod is not needed. 28 pin is powered by 3.3v.
                              Attached Files

                              Comment

                              • lotas
                                Badcaps Legend
                                • Jan 2016
                                • 4452
                                • Russia

                                #175
                                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                Here are the latest drivers for the CH341A programmer.
                                CH341SER.EXE - self-installing archive with USB to serial driver.
                                CH341PAR.EXE - self-installing archive with multiprotocol interface driver (this is for programmer mode)
                                Attached Files

                                Comment

                                • Diah
                                  Badcaps Legend
                                  • Feb 2013
                                  • 6336
                                  • Germany

                                  #176
                                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                  - OP CH314 still working.. this will never die or kill
                                  - GD25B32C I/O NOR Flash had leak. not shorted
                                  - DT602 had leak
                                  all above 2 & 3 points caused by Panel cells / COFs
                                  - end result T_con circuit on MB as ( nomoresonys ) expected but its toasted

                                  Comment

                                  • Nicktronic
                                    Badcaps Veteran
                                    • Mar 2023
                                    • 247
                                    • Canada

                                    #177
                                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                    Originally posted by Diah
                                    - OP CH314 still working.. this will never die or kill
                                    - GD25B32C I/O NOR Flash had leak. not shorted
                                    - DT602 had leak
                                    all above 2 & 3 points caused by Panel cells / COFs
                                    - end result T_con circuit on MB as ( nomoresonys ) expected but its toasted
                                    So your opinion is that the panel has the problem and there's no way to fix?

                                    Comment

                                    • lotas
                                      Badcaps Legend
                                      • Jan 2016
                                      • 4452
                                      • Russia

                                      #178
                                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                      Originally posted by Nicktronic
                                      So your opinion is that the panel has the problem and there's no way to fix?
                                      Not yet known.

                                      Comment

                                      • Nicktronic
                                        Badcaps Veteran
                                        • Mar 2023
                                        • 247
                                        • Canada

                                        #179
                                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                        Originally posted by lotas
                                        Not yet known.
                                        I think @diah is saying the T-Con circuit is toasted on the MB, do you disagree? New MB then?

                                        - GD25B32C I/O NOR Flash had leak. not shorted
                                        - DT602 had leak

                                        I'm waiting for a new SPI Flash, should I also order a new DT602?

                                        Comment

                                        • lotas
                                          Badcaps Legend
                                          • Jan 2016
                                          • 4452
                                          • Russia

                                          #180
                                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                          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.
                                          Last edited by lotas; 04-21-2023, 07:01 AM.

                                          Comment

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