Samsung QN75Q60TAF Boot Loop fixed but no picture

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  • Nicktronic
    Badcaps Veteran
    • Mar 2023
    • 247
    • Canada

    #101
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    Originally posted by Diah
    check pin 6 of ic where it go .. did it had contact at any lvds socket
    See picture. It goes through a 47.5 ohm resistor and directly to Pin 35.
    Attached Files

    Comment

    • lotas
      Badcaps Legend
      • Jan 2016
      • 4456
      • Russia

      #102
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      Wiring Diagram
      Attached Files

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6341
        • Germany

        #103
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        Originally posted by lotas
        All of these 6 pins go through the protection diodes and out to the control points.
        i don't think so... NO 6 SCLK had nothings to do with any protection

        output 0 and 1 yes each go to DT

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6341
          • Germany

          #104
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          Attached Files

          Comment

          • lotas
            Badcaps Legend
            • Jan 2016
            • 4456
            • Russia

            #105
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            Originally posted by Diah
            i don't think so... NO 6 SCLK had nothings to do with any protection

            output 0 and 1 yes each go to DT
            I will not argue, I tell it like it is.

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6341
              • Germany

              #106
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              LOL nothings to argue,, they are 2 channel Horizontal and Vertical. because the LVDS Single. IC had 8 pins. 2 GND & VCC and 4pins for data 2 for each channel. left 2 SCLK and chip select they go to test point not for any of DT

              Comment

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

                #107
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                Go ahead and test that resistor you mention there, see if the ohms are any or much different than the rest in that box there and maybe test some of the other similar resistors on other parts of the board, see what you get.
                Last edited by nomoresonys; 04-16-2023, 03:48 PM.

                Comment

                • Nicktronic
                  Badcaps Veteran
                  • Mar 2023
                  • 247
                  • Canada

                  #108
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Originally posted by lotas
                  Wiring Diagram
                  Yes, it's actually pins 61 and 62. I counted from the wrong end of the connector originally. So 35=62 and 36=61. Sorry about that..

                  Comment

                  • Nicktronic
                    Badcaps Veteran
                    • Mar 2023
                    • 247
                    • Canada

                    #109
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    Originally posted by nomoresonys
                    Go ahead and test that resistor you mention there, see if the ohms are any or much different than the rest in that box there and maybe test some of the other similar resistors on other parts of the board, see what you get.
                    Tested all resistors, see picture. Two open.....
                    Attached Files

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4456
                      • Russia

                      #110
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      Originally posted by Nicktronic
                      Tested all resistors, see picture. Two open.....
                      They can be at 10kOm (pull-up to 3.3v), and at 47 Om they are through (6 lines, 6pin)
                      Attached Files
                      Last edited by lotas; 04-16-2023, 05:23 PM.

                      Comment

                      • Nicktronic
                        Badcaps Veteran
                        • Mar 2023
                        • 247
                        • Canada

                        #111
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        Originally posted by lotas
                        They can be at 10kOm (pull-up to 3.3v), and at 47 Om they are through (6 lines, 6pin)
                        Yes, they are 4.68Kohm, sorry, they are not open.

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4456
                          • Russia

                          #112
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          4.68Kohm - 4.7 kOm.

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6341
                            • Germany

                            #113
                            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                            Originally posted by Nicktronic
                            Yes, it's actually pins 61 and 62. I counted from the wrong end of the connector originally. So 35=62 and 36=61. Sorry about that..
                            i think this statement of you wrong or the diagram belong to other chassis

                            any way.. since now the NOR out of the circuit. please compare in Diode mode DT601 602 specialty the reading of Pins 1 & 3 for each against them self and to other pins . also at reserve probe. to make it easy each time to measure write down where are the + & -

                            Comment

                            • Nicktronic
                              Badcaps Veteran
                              • Mar 2023
                              • 247
                              • Canada

                              #114
                              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                              Originally posted by Diah
                              i think this statement of you wrong or the diagram belong to other chassis

                              any way.. since now the NOR out of the circuit. please compare in Diode mode DT601 602 specialty the reading of Pins 1 & 3 for each against them self and to other pins . also at reserve probe. to make it easy each time to measure write down where are the + & -
                              Ok, will do.

                              Comment

                              • lotas
                                Badcaps Legend
                                • Jan 2016
                                • 4456
                                • Russia

                                #115
                                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                This wiring diagram is correct, it is from this chassis (from this model).

                                Comment

                                • lotas
                                  Badcaps Legend
                                  • Jan 2016
                                  • 4456
                                  • Russia

                                  #116
                                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                  Check if these pins match (6 pin(clk) with 35pin and 7pin(hold) with 36pin)
                                  These pins can be passed through 47 ohm resistors.
                                  Attached Files
                                  Last edited by lotas; 04-17-2023, 08:58 AM.

                                  Comment

                                  • Nicktronic
                                    Badcaps Veteran
                                    • Mar 2023
                                    • 247
                                    • Canada

                                    #117
                                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                    Originally posted by lotas
                                    Check if these pins match (6 pin(clk) with 35pin and 7pin(hold) with 36pin)
                                    These pins can be passed through 47 ohm resistors.
                                    I've already confirmed pin 6 (clk) and i will confirm pin7 (hold) tonight
                                    Attached Files

                                    Comment

                                    • Nicktronic
                                      Badcaps Veteran
                                      • Mar 2023
                                      • 247
                                      • Canada

                                      #118
                                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                      Originally posted by Diah
                                      i think this statement of you wrong or the diagram belong to other chassis

                                      any way.. since now the NOR out of the circuit. please compare in Diode mode DT601 602 specialty the reading of Pins 1 & 3 for each against them self and to other pins . also at reserve probe. to make it easy each time to measure write down where are the + & -
                                      If the wiring diagram @lotas provided is correct, then I believe we are dealing with pins 61 and 62, I've indicated this in the picture
                                      Attached Files

                                      Comment

                                      • lotas
                                        Badcaps Legend
                                        • Jan 2016
                                        • 4456
                                        • Russia

                                        #119
                                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                        Originally posted by Nicktronic
                                        If the wiring diagram @lotas provided is correct, then I believe we are dealing with pins 61 and 62, I've indicated this in the picture
                                        This is the schematic that I posted the motherboard pinouts, not the panel strips.
                                        Panel bar 1pin - goes to the motherboard on 96 pin, and 96pin goes to 1 pin (mirror).
                                        Attached Files
                                        Last edited by lotas; 04-17-2023, 11:43 AM.

                                        Comment

                                        • Diah
                                          Badcaps Legend
                                          • Feb 2013
                                          • 6341
                                          • Germany

                                          #120
                                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                          i am confused ... so many input.. i will stop until you provide the final check.

                                          Comment

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