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820-3115 B No green light on Magsafe

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  • 820-3115 B No green light on Magsafe

    PP3V42_G3H is good at 3.43 at the one wire circuit
    PP_BUS_G3H: 0V
    PPDCIN_S5_CHGR: 18.5V
    CHGR_ACOK = 0 V

    U7000

    RES PINS 27-28: 20.3 Ohm
    RES PINS 17-18: 3.2 Ohm

    2: 17.42V
    3: 4.32 V
    10: 3.47 V
    11:3.47 V
    14: 0 V
    19: 5.09 V
    20: 4.93 V

    R7010: 7.6 K which seems low but ACIN (PIN 3) seems good

    Since the current sensing seems good and U7000 is receiving DC in fine I am assuming R7010 is OK.
    CHGR_ACOK: 0 volts so no signal to ONEWIRE

    U7000 needs replacement?
    Last edited by Neil250; 6 days ago.

  • #2
    Any voltage at R7020?
    Why didn't post pin 1/U7000 too?

    Looks like bad U7000.
    Before change it, post exact ohm values (measured onboard) for R7080/81 and R7085/86.

    Comment


    • #3
      I will post those when I get home.

      Do CHGR_SGATE and CHGR_AGATE normally get shorted to ground so that the voltage dividers (R7085/R7086 and R7080/R7081)
      can fully open Q7085 and Q7080?
      Last edited by Neil250; 6 days ago.

      Comment


      • #4
        U7000 controls Q7080/85.
        We can find an answer if you post mentioned values...

        Comment


        • #5
          R7020: 0 V


          U7000
          PIN 1: 17.13 V

          R7080: 39.55 kO
          R7081: 39.86 kO

          R7085: 470 kO
          R7086: 332 kO

          Comment


          • #6
            Replaced U7000

            Now getting voltage in on my power source bouncing from 14.50 to 18.50

            Current draw: .35 to .90A
            Good news: magsafe is now green

            Q7085 voltage also jumping aroung 14.5 to 18.50
            Last edited by Neil250; 5 days ago.

            Comment


            • #7
              MAGSAFE NOW GREEN, BUT APPEARS FLICKERING
              EVEN FAN IS FLICKERING AND TWITCHING BUT NEVER SPINS
              voltages bouncing around
              U7000 changed

              PIN 1: 0-.1 V

              PIN 2: 14-18 V bouncing
              PIN 3: 3.38-4.3 V bouncing


              PIN 14: 3.32 V
              PIN 15: CHGR_BMON
              PIN 16: CHGR_BGATE
              PIN 17: CHGR_CSO_N
              PIN 18: CHGR_CSO_P
              PIN 19: 5.07 v
              PIN 20: 5.04

              PIN 21: CHGR_LGATE
              PIN 22: PGND


              PIN 26: 13-17 volts bouncing
              PIN 27: CHGR_CSI_N
              PIN 28: 14-18 V fluctuating
              PIN 29: (AGND)THRM_PAD

              RES 28-28: 20 O
              RES 17-18: 3.2 O

              R7010: 7.7 kO
              R7011: 6.9 kO

              R7085: 290 kO
              R7086: 230 kO
              R7020: also bouncing 14-18 V

              PPBUS_G3H: bouncing 7.4-12.4 V

              Q7085: shorted to ground at SOURCE (PINS1-3)



              I'm pretty sure I did a good job putting U7000 in place
              Last edited by Neil250; 5 days ago.

              Comment


              • #8
                Why did you replace U7000 so fast?
                You had just a bad Q7080.

                BTW, why do you post useless information???
                "PIN 15: CHGR_BMON
                PIN 16: CHGR_BGATE
                PIN 17: CHGR_CSO_N
                PIN 18: CHGR_CSO_P"

                U7000 could be bad, but never change something without reason.
                You should change Q7080 first.


                "Q7085: shorted to ground at SOURCE (PINS1-3)"
                I'm sure this is not true!!!
                Remove power when check diode mode to ground; also allow 10-15s before measure.

                Comment


                • #9
                  OK replaced Q7080.
                  Voltages still bouncing around.

                  Comment


                  • #10
                    Post now U7000 basic voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.

                    Comment


                    • #11
                      U7000

                      pins
                      1: 0 V
                      2: 18.03 V
                      3: 4.378V
                      9: .029
                      12: 3.47V
                      13: 3.44V
                      14: 3.33
                      15: .059 V
                      17: 7.5-12.45 V bouncing
                      19: 5.07 V
                      20: 4.44-4.80 V bouncing
                      27: 14V -18 V bouncing

                      Comment


                      • #12
                        Post exact resistance between pins 17/18 and 27/28 (ohm scale).

                        Remove F7040 and see if get steady voltage at R7050.

                        Comment


                        • #13
                          R 17/18: 3.1 O
                          R27/28: 20.4 O

                          REMOVED F7040
                          STEADY 12.57 V at R7050

                          Comment


                          • #14
                            OK, so you have a problem with a secondary power supply.
                            Post exact diode mode to ground at pad2/F7040 (fuse removed) and all big coils.

                            Comment


                            • #15
                              diode mode to ground at pad2/F7040: 0.464 V

                              diode to ground

                              L7100: 0.008 V
                              L7330: 0.14 V
                              L7630: 0.009V
                              L7220: 0.143 V
                              L9701: 0.439V
                              L3895: 0.530V

                              L7030: .496V

                              L7520: .002V
                              L7510: .002V
                              L7550: .002V



                              all big coils ?

                              as in: all coils in these power supplies?

                              Screen Shot 2020-02-16 at 10.59.48 AM.png
                              Last edited by Neil250; 4 days ago.

                              Comment

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