question about TPS51980B at 820-01987

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  • rookieme
    Badcaps Veteran
    • Oct 2014
    • 397
    • Greece
    #1

    question about TPS51980B at 820-01987

    Hello, the macbook has power issue - stuck at 5V.
    As I cannot find datasheet for TPS51980 [U7650] can someone help figuring out if there is an issue there.
    Voltages of TPS51980:
    pin23 VIN 12.27V
    pin22 VREG3 3.31V
    pin29 VREG5 0V
    pin13 VREF2 0V
    pin12 EN 0V

    so in order to get VREG5 & VREF2 it needs the enable at pin12 and VREG3 is always on?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14106
      • Canada
      #2
      Re: question about TPS51980B at 820-01987

      Remove all power. Measure the resistance to ground of vreg5 pin.

      Post the measurement.

        Comment

        • rookieme
          Badcaps Veteran
          • Oct 2014
          • 397
          • Greece
          #3
          Re: question about TPS51980B at 820-01987

          I have already checked for shorts.
          It is 17KOhm

            Comment

            • dellxps15
              Badcaps Legend
              • Feb 2014
              • 1588
              • italy
              #4
              Re: question about TPS51980B at 820-01987

              820-01987 is 2020 macbook right ? 12,3 volt on vin is not good.... it should be around 13 volt.

              dc in is 5 or 20 volt ?

                Comment

                • rookieme
                  Badcaps Veteran
                  • Oct 2014
                  • 397
                  • Greece
                  #5
                  Re: question about TPS51980B at 820-01987

                  2020 correct
                  input is stuck at 5V so I'm searching for the reason

                    Comment

                    • dellxps15
                      Badcaps Legend
                      • Feb 2014
                      • 1588
                      • italy
                      #6
                      Re: question about TPS51980B at 820-01987

                      5v on charger is totally different problem, not related to tps51980.

                      check 3.3 g3hot volt if present, and all ldo volts.

                        Comment

                        • rookieme
                          Badcaps Veteran
                          • Oct 2014
                          • 397
                          • Greece
                          #7
                          Re: question about TPS51980B at 820-01987

                          you are right
                          short at PP3V3_G3H
                          I found shorted cap at PP3V3_G3H_SSD0 and more short under shield at T2 area
                          is seems game over to me

                          thank you for your time

                            Comment

                            • dellxps15
                              Badcaps Legend
                              • Feb 2014
                              • 1588
                              • italy
                              #8
                              Re: question about TPS51980B at 820-01987

                              inspect ssd power ic if looks ok or bad... probably ssd got fried and unless u swap ssd nand ur board is dead, but before all that check everything

                                Comment

                                • rookieme
                                  Badcaps Veteran
                                  • Oct 2014
                                  • 397
                                  • Greece
                                  #9
                                  Re: question about TPS51980B at 820-01987

                                  The security chip T2 has issue so there is a no fix.
                                  I'm wondering how 2 separate locations have short at the same line, I'm guessing over-voltage.

                                    Comment

                                    • moderator
                                      Member
                                      • May 2020
                                      • 32
                                      • India
                                      #10
                                      Re: question about TPS51980B at 820-01987

                                      can someone please tell me that can i use tps51980A or tps51980 insted of tps51980B??

                                        Comment

                                        • Deluccia
                                          Member
                                          • Aug 2017
                                          • 46
                                          • uk
                                          #11
                                          Re: question about TPS51980B at 820-01987

                                          Any verdict on this?

                                            Comment

                                            • mon2
                                              Badcaps Legend
                                              • Dec 2019
                                              • 14106
                                              • Canada
                                              #12
                                              Re: question about TPS51980B at 820-01987

                                              https://www.badcaps.net/forum/showthread.php?p=1208119

                                                Comment

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