a1706 820-00923 no power if battery connected

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  • guruji
    Senior Member
    • Oct 2012
    • 120
    • India
    #1

    a1706 820-00923 no power if battery connected

    hello
    I have this laptop a1706 when you disconnect the battery the laptop powers on .the moment we connect the battery the laptop powers on for a second and then shuts off. changed several batteries same issue.But if the battery is connected i can see the voltage charging the battery with a volt meter the battery voltage steps up.now there is a diode D6950 rclamp zener for surge protection on data and clk ,this was giving me wrong readings so i removed it and still same issue.any ideas
    thanks
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14599
      • Canada
      #2
      Re: a1706 820-00923 no power if battery connected

      What are the voltage readings to ground of the pcb pads of d6950 with the battery connected?

      During the charging phase, do you see the charging graphic in your software?

      What are the voltage readings on the battery mosfet that interfaces with the battery? Measure the voltage on source, gate, drain to ground.

      Do check the components that are linked to the battery leg for the current sensing.

        Comment

        • guruji
          Senior Member
          • Oct 2012
          • 120
          • India
          #3
          Re: a1706 820-00923 no power if battery connected

          Originally posted by mon2
          What are the voltage readings to ground of the pcb pads of d6950 with the battery connected? 3.3V but keeps varying 3.4v not stable

          During the charging phase, do you see the charging graphic in your software? yes it show battery is charging the percentage increases

          What are the voltage readings on the battery mosfet that interfaces with the battery? Measure the voltage on source, gate, drain to ground. 13V 12.4 and gate is 4.65v

          Do check the components that are linked to the battery leg for the current sensing.
          all checked the current sensing resistor and also traces

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14599
              • Canada
              #4
              Re: a1706 820-00923 no power if battery connected

              So far, looks ok.

              With a good charged battery, what are mosfet readings?

              The gate has to be lower than the voltage it is passing so the measured voltage is good to enable the P-channel mosfet.

              The mosfet may be instructed to turn off if the charger IC is unable to gauge the current consumption on this leg of the circuit.

              Do also check if the mosfet is defective. You can remove all power, meter in resistance mode.

              Measure the resistance across,

              Source (1-2-3) and drain (5-6-7-8)
              Source (1-2-3) and gate (4)
              Gate (4) and drain (5-6-7-8)

              Post each measurement.

                Comment

                • guruji
                  Senior Member
                  • Oct 2012
                  • 120
                  • India
                  #5
                  Re: a1706 820-00923 no power if battery connected

                  the customer was not ready to wait, I had to return it but my guess was the smc error.

                    Comment

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