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820-2850 A No PPBUS_G3H

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  • 820-2850 A No PPBUS_G3H

    Very new to board repair

    Green Light on charger

    Decided to start with U7000

    R7020: 0 VOLTS
    PPDCIN_G3H: 18.5V
    Q7080: SOURCE: 18.5V GATE: 17.88 DRAIN: 18.03
    Q7085: SOURCE: 18.03V GATE: 17.23 DRAIN: 0V

    R7085 actually sparked when I tested it

    R7020: 0 VOLTS (PPBUS_G3H_DCINRUSH)

    U7000: RESISTANCE PINS 27-28 20.3 OHMS (CURRENT SENSING)

    F7040 Fuse: pin 2: 0 V (starts at 1 and slowly drifts to 0)

    U7000
    PIN 14: SMC_BC_ACOK: 3.27V
    PIN 19: 5.1 V



    My thought is that Q7085 is bad. Should have voltage going through it. Without that, no PPBUS_G3H

    Am I on the right track?


  • #2
    Q7085 is blocked; is controlled by U7000.
    Post basic voltages for U7000; pins 1, 2, 3, 9, 12, 13, 15, 17, 19, 20, 27.
    Also post exact ohm resistance between pins 17/18.

    Need to know exact values for R7085/86; ohm scale, measured onboard.

    Comment


    • #3
      Post basic voltages for U7000;
      pins

      1: 16.70
      2: 18.24
      3: 0.206
      9: 0.030
      12: 3.412
      13: 3.41
      15: 0.048
      17: 0.233
      19: 5.115
      20: 5.115
      27: 0
      28: 0

      RESISTANCE 17/18: 3.5 ohm

      R7085: 470 Kohm
      R7086: 331 Kohm



      Comment


      • #4
        "3: 0.206"
        Missing ACIN, ISL6259 doesn't work until fix this problem.
        Check R7010 and C7011.

        Comment


        • #5
          R7010: 4 kOhm
          R7011: 330 Ohm
          C7011: 0 uF

          R7013 is missing completely which makes no sense to me (I double and triple checked)
          R7012: 1 kOhm

          Last edited by Neil250; 2 weeks ago.

          Comment


          • #6
            "R7011: 330 Ohm"
            Do you mean onboard value?
            Remove C7011.
            If you still get the same value, change U7000.

            "C7011: 0 uF"
            I was not thinking on its capacity...

            Comment


            • #7
              "R7011: 330 Ohm"
              Do you mean onboard value?

              "C7011: 0 uF"
              I was not thinking on its capacity...


              Were you asking about short to ground or?

              Sorry, new to this but I do appreciate your time.
              After your response I usually spend time looking at the schematic to figure how and why to ask the same question you did.

              Comment


              • #8
                ACIN input measured on diode mode gave very low value on your board.
                Only two options available:
                - C7011 leakage, can be discarded measuring after removed.
                - U7000 internal problems and needs change.

                Comment


                • #9
                  And:

                  R7013 is missing completely ? any idea why. It is not a NOSTUFF on this board

                  Comment


                  • #10
                    R7012/13 can NOT be present at same time.
                    R7012 is for 3 cells battery and R7013 for 2 cells battery.
                    If none present, U7000 will deliver aprox 4V on PPBUS_G3H; it will suppose 1 cell battery present...

                    Comment

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