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820-00875 PPBUS_G3H boosting after liquid damage

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  • #31
    Ok is PP3v3_G3H present, slightly low, or missing? Being there was liquid near the CD3215s I would not surprised if they are an issue.

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    • #32
      PP3v3_G3H isn't present on charger (expected) or on battery. Both show 0.0v

      Its near on impossible for me to test around U6990 on battery but on the charger I get 5.2v on D6905 pin 2 5.1v on pin 3
      On D6990, I get 5.1v on pin 2 but 0.0v on pin 10 enable.

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      • #33
        PP3V3_G3H enable comes from U7000.
        As SMC requires this voltage, problem should be on U7000 area, not on USB-C controllers, nor SMC.
        Cannot have communication between them, without PP3V3_G3H.

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        • #34
          Pin 27 on U7000 is a direct connection to Pin 2 of R6991 from what I can tell.
          As I'm not getting anything on R6991 I wanted to look at U7000 to see if it is even getting the voltages it needs, but I'm not good enough at understanding the schematic just yet.

          Could someone better than me let me know what voltages I need around U7000 to feed U7000 please. That way I can see if it needs replacing or its something feeding it thats is the issue.

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          • #35
            Check basic voltages on U7000; P_IN, AUX_DET, VDDA/P, AUX_OK.

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            • #36
              Thank you 2informaticos..

              Pin 10 - P_IN = 5.16v
              Pin 18 - AUX_DET = 1.28v
              Pin 2 - VDDA = 1.39v
              Pin 17 - VDDP = 1.39v
              Pin 28 - SMC_AUX_OK = 0.0v

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              • #37
                Pin 2 - VDDA = 1.39v
                Pin 17 - VDDP = 1.39v
                Change U7000...

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                • #38
                  Okay.. I'll give that a go.

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                  • #39
                    What should VDDA and VDDP be showing as? I'm assuming SMC_AUX_OK should be outputting something also but it looks like that needs 3v3 too

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                    • #40
                      U7000 requires (internally generated) 5V to work.
                      And is not present in your case...

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                      • #41
                        Now to find a UK supplier of the chip

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                        • #42
                          Replaced U7000. Getting 5v on VDDA & VDDP now. Still have an issue with PPBUS_G3H as it’s jumping between 3.6v and 12.95 continuously.

                          I can’t get it to start in SMC bypass either, I just get a fast fan for 2 seconds and it goes off again

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                          • #43
                            20.3v dcin now though

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                            • #44
                              ALL_SYS_PWRGD is jumping from 0v to 3.2v continuously also

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                              • #45
                                Ive taken F7000 off the board to see if PPBUS_G3H fluctuates on the pin one side of the fuse when its not continuing on to the system. Its still fluctuating but not as much (or my meter can't see it) it looks like its going from 7v to 12.95v repeatedly

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