question about TPS51980B at 820-01987

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • rookieme
    Badcaps Veteran
    • Oct 2014
    • 399
    • 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
      • 14631
      • 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
          • 399
          • Greece
          #3
          Re: question about TPS51980B at 820-01987

          I have already checked for shorts.
          It is 17KOhm

            Comment

            • dellxps15
              Badcaps Legend
              • Feb 2014
              • 1598
              • 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
                  • 399
                  • 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
                      • 1598
                      • 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
                          • 399
                          • 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
                              • 1598
                              • 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
                                  • 399
                                  • 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
                                      • 33
                                      • 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
                                              • 14631
                                              • Canada
                                              #12
                                              Re: question about TPS51980B at 820-01987

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

                                                Comment

                                                Previous template Next

                                                Related Topics

                                                Collapse
                                                • microitech
                                                  Mac Mini A1347 (820-5509) PM_SLP_S5_L missing
                                                  by microitech
                                                  Hi everyone,

                                                  I've been troubleshooting a Mac Mini A1347 (820-5509) that came in for a simple thermal paste replacement, but it turned into a challenging repair. I've made some progress, but I'm stuck at a point and could really use some advice from those more experienced with this board
                                                  Worked fine for a week, then started powering on intermittently.




                                                  What I've done so far:

                                                  • Found PP3V3_G3H in short.

                                                  • Removed and replaced an AND gate (74LVC1G08) and an OR gate, which were causing issues on the line.

                                                  ...
                                                  12-21-2024, 11:57 AM
                                                • pb1911nt
                                                  820-00165 issues - waht can i do
                                                  by pb1911nt
                                                  Hello community, I have a MacBook Air 820-00165 with an i5 and 8GB Ram. The logic board doesn't want to start. I've taken some measurements but I can't really get any further.

                                                  And please excuse me if something is spelled wrong, I have to use a translator.

                                                  -------

                                                  PPBUS_G3H = 8.6 V (stable)
                                                  PP3V42_G3H = 3.44 V (stable)
                                                  First Always/SMC signals
                                                  SMC_RESET_L = 3.4 V (stable → SMC running)
                                                  SMC_PM_G2_EN = pulses between 0 V ↔ 3.3 V
                                                  PM_PWRBTN_L = pulses between 0 V ↔ 3.3 V
                                                  PM_SLP_S5_L = pulses between 0 V ↔ 0.2 V
                                                  ...
                                                  09-30-2025, 12:26 PM
                                                • moderator
                                                  TPS51980B Vs TPS51980A !!!URGENT!!!
                                                  by moderator
                                                  can someone please tell me that can i use tps51980A or tps51980 insted of tps51980B??

                                                  in schematics and in pdf ...they are both showing same signal and voltages..

                                                  actually i am working on A2141, 16 inch macbook pro and i am suspecting TPS51980B faulty..but i dont have same part handy...but i have TPS51980A ...

                                                  so can i use it?
                                                  02-11-2023, 03:07 AM
                                                • rookieme
                                                  LA-3741P issue with TPS51120
                                                  by rookieme
                                                  I need some help with this MB.
                                                  Schematic available at
                                                  https://www.badcaps.net/forum/showth...24#post1272124

                                                  I have the 19,5V but not the 3,3 & 5 V.
                                                  TPS51120 gets warm
                                                  VREF2 = 2.00V
                                                  VREG3 = 1,01V
                                                  VREG5 = 4,99V

                                                  so far I have replaced the TPS but with same results
                                                  I cannot find any short
                                                  I have removed PJP4, PJP5 & PJP12 and after the PQ4,PQ5, PQ6 & PQ7.
                                                  the VREG still is low

                                                  Could the second TPS I had to be faulty too? I don't have more to try.
                                                  09-18-2023, 03:28 AM
                                                • Bradbeat
                                                  TPS51225CRUKR Voltage limit
                                                  by Bradbeat
                                                  Hi,
                                                  I have a PGOOD pin down on this chip and I’m wondering if it could be because there is 5,2 v on VREG5 ( the high limit according to the datasheet is 5,1v ).
                                                  if yes, why is it to high?
                                                  the motherboard board is LA-G881P.
                                                  thank you.

                                                  here is some measurements :
                                                  • VIN = 16,3 V
                                                  • VREG3 = 3,299 V
                                                  • VREG5 = 5,203 V
                                                  • SW2 (repos) = 3,423 V, pikes at ~16,4 V
                                                  • VBST2 = 8,592 V → VBST2 − SW2 = ≈ 5,17 V
                                                  • VO1 = 5,28 V (stable)
                                                  • EN1 = 3,08 V, EN2 = 3,04 V
                                                  • VFB1/VFB2 ≈ 2,1 V
                                                  ...
                                                  09-18-2025, 05:07 AM
                                                • Loading...
                                                • No more items.
                                                Working...