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Acer SF314-52 charging

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    #1

    Acer SF314-52 charging

    Hey guys,
    I got problem with Acer SF314-52. Problem is that laptop wont charge battery, I did put new battery which was on about 60%, and laptop was plugged all the time and battery went to 1%. Laptop is normally working on charger.
    I did try to replace first two mosfets --> same problem
    I did try to replace BQ chip --> same problem

    I measure that on coil next to the battery connector (which is connected with + of connector) I got about 3,5V.

    I don't have idea anymore, what is next to check?

    Tnx
    Tags: None
    #2
    Re: Acer SF314-52 charging

    1) is the battery pack detected ?

    2) what is the voltage of +BAT_CON with the battery & adapter connected ?

    3) Remove all power. Meter in DC volts scale. Measure the voltage of +BAT_CON (without adapter connected).

    I measure that on coil next to the battery connector (which is connected with + of connector) I got about 3,5V.
    Is the reading of the coil L8800, pin # 2 ?

    What is the reading in volts ?

    4) Also measure the voltage @ AC_BAT_SYS with the battery only connected.

    Comment

      #3
      Re: Acer SF314-52 charging

      1.) yea battery pack is detected

      2.) +batt con with ac adapter plugged in is same as without ac adapter. (it is battery voltage, I did try with serveral batteries, and did try all of that batteries in other Acer and they all work normally)

      3.) yea on coil L8800 I got 3V with battery disconnected and charger plugged in.

      4.) bat_sys with just battery 15.08V and with charger connected is jumping from 15.08V to 19.67V every second

      Comment

        #4
        Re: Acer SF314-52 charging

        3.) yea on coil L8800 I got 3V with battery disconnected and charger plugged in.
        This is ok since you do not have a battery connected so no job to do..

        1) Attach the battery and the adapter. What is the voltage @ L8800, pin # 2?

        2) Your battery is showing a voltage ~15.08V which is ok.

        3) Remove all power (no battery) -> meter in resistance mode.

        Check the status of the battery mosfet @ Q8802 as follows:

        source (1-2-3) & drain (5-6-7-8)
        source (1-2-3) & gate (4)
        gate (4) & drain (5-6-7-8)

        Post your measurements and the meter scale used for each. If you see '1' on the meter, switch to the next higher resistance scale.

        We are checking for a low resistance which often means the mosfet is defective.

        Comment

          #5
          Re: Acer SF314-52 charging

          What is the platform name?? DC in fets Gate voltage??

          Comment

            #6
            Re: Acer SF314-52 charging

            Originally posted by mon2 View Post
            source (1-2-3) & drain (5-6-7-8)
            source (1-2-3) & gate (4)
            gate (4) & drain (5-6-7-8)


            Post your measurements and the meter scale used for each. If you see '1' on the meter, switch to the next higher resistance scale.
            source (1-2-3) & drain (5-6-7-8) 165k Ohm
            source (1-2-3) & gate (4) 5,9M Ohm
            gate (4) & drain (5-6-7-8) no reading (did try 100 times)


            Try to replace it or that's normal?

            Comment

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