XPS13 all rails present, continuous shutoff cycle

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  • survivalbloke
    Badcaps Veteran
    • Aug 2021
    • 268
    • United States

    #21
    Re: XPS13 all rails present, continuous shutoff cycle

    Originally posted by Sephir0th
    Since we still know to less about where it is Stuck, i'd continue with a overview which power rails are where present in the Brief moment. This means to measure voltage of each coil and share the values, maybe written in a picture of the actual board.
    Will do, thanks!

    Comment

    • survivalbloke
      Badcaps Veteran
      • Aug 2021
      • 268
      • United States

      #22
      Re: XPS13 all rails present, continuous shutoff cycle

      Originally posted by Sephir0th
      Since we still know to less about where it is Stuck, i'd continue with a overview which power rails are where present in the Brief moment. This means to measure voltage of each coil and share the values, maybe written in a picture of the actual board.
      I'm posting a pic with voltage readings. Thanks!
      Attached Files

      Comment

      • Sephir0th
        Badcaps Legend
        • Oct 2020
        • 1262
        • Germany

        #23
        Re: XPS13 all rails present, continuous shutoff cycle

        So everything till 1.05V is up and running. The PCH should do its job from here, but it obviously doesn't. Question is ofc, why.

        What resistance to GROUND do you measure at the coils which shows voltage?
        FairRepair on YouTube

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india

          #24
          Re: XPS13 all rails present, continuous shutoff cycle

          Originally posted by survivalbloke
          I'm posting a pic with voltage readings. Thanks!
          Can you post a larger pic? I'm having difficulty in reading what you wrote. Getting old perhaps.

          Comment

          • survivalbloke
            Badcaps Veteran
            • Aug 2021
            • 268
            • United States

            #25
            Re: XPS13 all rails present, continuous shutoff cycle

            Originally posted by Sephir0th
            So everything till 1.05V is up and running. The PCH should do its job from here, but it obviously doesn't. Question is ofc, why.

            What resistance to GROUND do you measure at the coils which shows voltage?
            See attached, better photo.
            Attached Files

            Comment

            • survivalbloke
              Badcaps Veteran
              • Aug 2021
              • 268
              • United States

              #26
              Re: XPS13 all rails present, continuous shutoff cycle

              Originally posted by mcplslg123
              Can you post a larger pic? I'm having difficulty in reading what you wrote. Getting old perhaps.
              That was a really bad picture, sorry. Please see the new, better pic.

              Comment

              • mcplslg123
                Badcaps Legend
                • Jun 2015
                • 7262
                • india

                #27
                Re: XPS13 all rails present, continuous shutoff cycle

                PL601 is most likely the ram coil and its not having any voltage. Check the PWM for S3/S5/Ton pins. When you turn on,do you get any voltage there?? What about the 1.8V/2.5V rail?? Are they coming up?

                Comment

                • survivalbloke
                  Badcaps Veteran
                  • Aug 2021
                  • 268
                  • United States

                  #28
                  Re: XPS13 all rails present, continuous shutoff cycle

                  Originally posted by mcplslg123
                  PL601 is most likely the ram coil and its not having any voltage. Check the PWM for S3/S5/Ton pins. When you turn on,do you get any voltage there?? What about the 1.8V/2.5V rail?? Are they coming up?
                  I suppose I'll need an oscilloscope to check PWM? Also I don't know where to measure those. Lastly, I don't know where to measure for the 1.8V and 2.5V.

                  I realize this is really far beyond my experience level, but I'm learning, and I thank all of you.

                  Comment

                  • mcplslg123
                    Badcaps Legend
                    • Jun 2015
                    • 7262
                    • india

                    #29
                    Re: XPS13 all rails present, continuous shutoff cycle

                    mEASURE VOLTAGE ON PIN 1/2/10/14 OF PU600.
                    1.8V can be measured at Pin1 of PU800 or on PL801 coil itself.
                    I think 2.5V rail is not used here.
                    All these voltage has to be measured after turning on the mb.
                    You need needle sharp probes to measure them.Be careful not to accidentally short between pins.

                    PS: Oscilloscope is a better option but we can get an idea with multimeter as well.

                    Comment

                    • survivalbloke
                      Badcaps Veteran
                      • Aug 2021
                      • 268
                      • United States

                      #30
                      Re: XPS13 all rails present, continuous shutoff cycle

                      Originally posted by mcplslg123
                      mEASURE VOLTAGE ON PIN 1/2/10/14 OF PU600.
                      1.8V can be measured at Pin1 of PU800 or on PL801 coil itself.
                      I think 2.5V rail is not used here.
                      All these voltage has to be measured after turning on the mb.
                      You need needle sharp probes to measure them.Be careful not to accidentally short between pins.

                      PS: Oscilloscope is a better option but we can get an idea with multimeter as well.
                      OK, thank you. on PU600:
                      1 - 0v
                      2 - 0v
                      10 - 8.9v
                      14 - jumps to 1.7v then drops back to 0v

                      1.8v present at PL801

                      Comment

                      • mcplslg123
                        Badcaps Legend
                        • Jun 2015
                        • 7262
                        • india

                        #31
                        Re: XPS13 all rails present, continuous shutoff cycle

                        Pin14 Voltage must be stable. I've not gone through the datasheet of this IC but usually VCC is 3V or 5V. What is the exact resistance on pin14??(no power attached). Is there continuity between PC606 & PC607(pin1 of both caps)?? You dont have the enables for this ram regulator-so cant expect any output.

                        AS per your measurement, you have missing RUN_ON_P as well as SUS_ON_P.Do you have RUN_ON_EC?

                        Comment

                        • survivalbloke
                          Badcaps Veteran
                          • Aug 2021
                          • 268
                          • United States

                          #32
                          Re: XPS13 all rails present, continuous shutoff cycle

                          Originally posted by mcplslg123
                          Pin14 Voltage must be stable. I've not gone through the datasheet of this IC but usually VCC is 3V or 5V. What is the exact resistance on pin14??(no power attached). Is there continuity between PC606 & PC607(pin1 of both caps)?? You dont have the enables for this ram regulator-so cant expect any output.

                          AS per your measurement, you have missing RUN_ON_P as well as SUS_ON_P.Do you have RUN_ON_EC?
                          Pin 14 = OL
                          Pin 1 PC606 to Pin 1 PC607 = .7ohms
                          RUN_ON_EC = I get a brief(less than 1 second) 1.9v, then back to zero each time the board tries to power on.

                          Comment

                          • mcplslg123
                            Badcaps Legend
                            • Jun 2015
                            • 7262
                            • india

                            #33
                            Re: XPS13 all rails present, continuous shutoff cycle

                            This mb SIO is in BGA form-so cant troubleshoot much. I've not much to suggest further. maybe other experts here can help.

                            Comment

                            • survivalbloke
                              Badcaps Veteran
                              • Aug 2021
                              • 268
                              • United States

                              #34
                              Re: XPS13 all rails present, continuous shutoff cycle

                              Originally posted by mcplslg123
                              This mb SIO is in BGA form-so cant troubleshoot much. I've not much to suggest further. maybe other experts here can help.
                              Hey, I ended up just replacing the board, but I wanted to stop back here and thank you all for the help.

                              Comment

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