Acer a515-43 low battery charge voltage

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  • ruletero
    Senior Member
    • Nov 2018
    • 182
    • Mexico

    #1

    Acer a515-43 low battery charge voltage

    Hi

    Acer A515-43
    LA-H801P

    Fail: Does not charge battery, has low voltaje on connector.

    Laptop didn't want to turn on, only charge led blinked.

    I found PQB5 (mosfet high battery charger) in short, voltaje in +12.6V_BATT was 19 v ...

    I changed it, changed PQB6 too and now battery charger voltage is 4.4V but battery is 3 cell, 11.25v, then is very low to charging.

    Laptop turns on without battery and works fine, but with battery turns on and turns off inmediately, I suspect battery bad but I don't know why battery charge voltaje is only 4.4v, I readed bq24780 datasheet (similar IC) and I found that:

    "The bq24780S charges 1-4 cell battery in constant current (CC), and constant voltage (CV) mode. The host
    programs battery voltage in REG0x15(). According to battery voltage, the host programs appropriate charge
    current in REG0x14()."

    and "Setting the Charge Voltage
    To set the output charge regulation voltage, write a 16-bit ChargeVoltage() command (0x15H or 0b00010101)
    using the data format listed in Table 13. The bq24780S device provides charge voltage range from 1.024 to
    19.200 V, with 16-mV step resolution. Upon POR, charge voltage limit is 0 V. Sending ChargeVoltage() 0 mV
    terminates charge."

    Who programs the IC? bios? I update bios without success, same behaviour, and I do not find another way to change that voltage.

    Please, could you help me?
    Attached Files
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14019
    • Canada

    #2
    Re: Acer a515-43 low battery charge voltage

    1) Check the 2 x DCIN mosfets. Specifically, the 2nd mosfet @ PQB4.

    Remove all power / no battery.

    Meter in resistance mode.

    Check the resistance of PQB4:

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


    Post each measurement.

    2) What is the voltage of ACDRV when the unit is on ?

    3) REGN voltage ?
    Attached Files

    Comment

    • ruletero
      Senior Member
      • Nov 2018
      • 182
      • Mexico

      #3
      Re: Acer a515-43 low battery charge voltage

      Hi

      PUB1
      REGN pin 24 = 6.07v
      ACDRV pin 4 = 24.9v
      ACOK pin 5 = 3.3v
      ACDET pin 6 = 2.54v

      Check the resistance of PQB4:

      source (1-2-3) & drain (5-6-7-8) 40 to 60 M ohms
      source (1-2-3) & gate (4) 20 to 60 M ohms
      gate (4) & drain (5-6-7-8) 40 to 90 M ohms

      I guess PQB4 is working fine, it has 19.2v in PRB3 and it turns on and works fine...

      I suspect from Smbus lines of PUB1 (BQ2478) due charger data configuration is received by these lines, I'm going to replace it.

      Very thanks Mon

      Comment

      • ruletero
        Senior Member
        • Nov 2018
        • 182
        • Mexico

        #4
        Re: Acer a515-43 low battery charge voltage

        BQ24781 replaced with BQ24780s, now charging battery.

        Thanks friends

        Comment

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