Samsung QN75Q60TAF Boot Loop fixed but no picture

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

    #61
    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

    Leave it off and remove the other one.

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6341
      • Germany

      #62
      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

      Originally posted by Nicktronic
      Diah, I removed IC601 and everything else connected normally, mask removed and the boot loop is gone. The TV boots up, I hear the little samsung jingle and no picture.
      write the label No of this IC

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4457
        • Russia

        #63
        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

        Originally posted by diah
        write the label no of this ic
        gd25b32csig
        Attached Files
        Last edited by lotas; 04-15-2023, 10:05 AM.

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6341
          • Germany

          #64
          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

          Originally posted by lotas
          gd25b32csig
          GD25B32C I/O NOR Flash..

          he need first to check with Diode mode between pin 8 VCC and pin 4 GND
          Last edited by Diah; 04-15-2023, 10:11 AM.

          Comment

          • Nicktronic
            Badcaps Veteran
            • Mar 2023
            • 247
            • Canada

            #65
            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

            1.727 VDC - Neg lead on 4, Pos lead on 8

            0.557 VDC - Pos lead on 4, Neg lead on 8

            No beeps

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6341
              • Germany

              #66
              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

              Originally posted by Nicktronic
              1.727 VDC - Neg lead on 4, Pos lead on 8

              0.557 VDC - Pos lead on 4, Neg lead on 8

              No beeps
              its low to me..
              try to dump it hope yours programmer can read it.

              if it did... mean good sign

              Comment

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

                #67
                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                I don't think he has a programmer.
                Last edited by nomoresonys; 04-15-2023, 11:48 AM.

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6341
                  • Germany

                  #68
                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                  Originally posted by nomoresonys
                  I don't think he has a programmer.
                  well if his measurements at post#65 correct... then he should put in programmer to check if it can read or not. this is the only way i do know to test NOR... if some one know other way .. welcome.

                  Comment

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

                    #69
                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                    I do not, so now what, take the other one off?

                    Comment

                    • Nicktronic
                      Badcaps Veteran
                      • Mar 2023
                      • 247
                      • Canada

                      #70
                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                      I don't have a programmer, no. My readings in Post #65 are correct.

                      @nomoresonys, are you suggesting take of DT601 and DT602?

                      Comment

                      • lotas
                        Badcaps Legend
                        • Jan 2016
                        • 4457
                        • Russia

                        #71
                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                        What is the resistance on these pins (1,2,3,5,6,7) relative to 4 pin. (GND) without ic601?
                        Attached Files

                        Comment

                        • Nicktronic
                          Badcaps Veteran
                          • Mar 2023
                          • 247
                          • Canada

                          #72
                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                          They are all open to GND

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6341
                            • Germany

                            #73
                            Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                            don't take any parts out from the boards... buy cheap programmer and test the NOR you get it out

                            Comment

                            • Nicktronic
                              Badcaps Veteran
                              • Mar 2023
                              • 247
                              • Canada

                              #74
                              Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                              can you provide a link? Thanks.

                              Comment

                              • Diah
                                Badcaps Legend
                                • Feb 2013
                                • 6341
                                • Germany

                                #75
                                Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                Originally posted by Nicktronic
                                can you provide a link? Thanks.
                                look after CH341a the cheapest and had many helpful ways at repair

                                Comment

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

                                  #76
                                  Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                  Originally posted by Nicktronic
                                  I don't have a programmer, no. My readings in Post #65 are correct.

                                  @nomoresonys, are you suggesting take of DT601 and DT602?
                                  Well it's one way of seeing if it is that one that is the problem but do what you want, the tv should display a picture if you have a bad one and remove it, I could be wrong, my memory isn't that great.

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6341
                                    • Germany

                                    #77
                                    Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                    Originally posted by nomoresonys
                                    Well it's one way of seeing if it is that one that is the problem but do what you want, the tv should display a picture if you have a bad one and remove it, I could be wrong, my memory isn't that great.
                                    i know what you are thinking... and you may right... the t-con on the MB are toasted so no Picture or any sign... but we cant ask him right now to change MB... unless we do know the panel worth to replace MB ..

                                    Comment

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

                                      #78
                                      Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                      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?
                                      Last edited by nomoresonys; 04-15-2023, 04:05 PM.

                                      Comment

                                      • Nicktronic
                                        Badcaps Veteran
                                        • Mar 2023
                                        • 247
                                        • Canada

                                        #79
                                        Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                        Originally posted by nomoresonys
                                        Well it's one way of seeing if it is that one that is the problem but do what you want, the tv should display a picture if you have a bad one and remove it, I could be wrong, my memory isn't that great.
                                        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?

                                        Comment

                                        • Nicktronic
                                          Badcaps Veteran
                                          • Mar 2023
                                          • 247
                                          • Canada

                                          #80
                                          Re: Samsung QN75Q60TAF Boot Loop fixed but no picture

                                          Originally posted by Diah
                                          look after CH341a the cheapest and had many helpful ways at repair
                                          I ordered it, should be here Monday or Tuesday, but I will need a little help on how to use it. Maybe a simple step by step to test my IC601?

                                          Comment

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