ACER e1-531 not charging .

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  • mo000
    Badcaps Veteran
    • Nov 2017
    • 274
    • algeria

    #1

    ACER e1-531 not charging .

    hi everyone
    the laptop comes to me with water damage
    i clean it and i fix the shorted (the short not in charging circuit) .
    the laptop works fine with battery and with charger
    but when i plug in the power supply to charge the battery the voltage becomes 16 v with high amps 5A and mosfet PQ9 becomes very hot

    i change the PQ9 PQ11 and charger ic BQ25A and PR52 and pq12 pq13 witout any change .
    Attached Files
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14022
    • Canada

    #2
    Re: ACER e1-531 not charging .

    Remove all power. Meter in resistance mode (2k).

    Check resistance of:

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

    for each mosfet. Low readings are of concern.

    Which exact mosfet was used for PQ9 ?

    Comment

    • mo000
      Badcaps Veteran
      • Nov 2017
      • 274
      • algeria

      #3
      Re: ACER e1-531 not charging .

      Originally posted by mon2
      Remove all power. Meter in resistance mode (2k).

      Check resistance of:

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

      for each mosfet. Low readings are of concern.

      Which exact mosfet was used for PQ9 ?
      PQ9 (S-D) 0 ohm (S-G) 5 ohms (G-D) 5 ohms
      PQ10 (S-D) 0 ohm (S-G) 5 ohms (G-D) 0 ohms
      PQ11 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms
      PQ12 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms
      PQ13 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms

      PQ9 mosfet AO4496

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14022
        • Canada

        #4
        Re: ACER e1-531 not charging .

        Wow. From the posted resistance values, each mosfet appears to be defective.

        Try the following:

        a) remove PQ9 off the logic board. Then measure the resistance again for the removed mosfet. Are the readings much different of the removed component ?

        b) with PQ9 removed - check the resistance of the PCB pads where PQ9 was soldered.

        Post the values of PQ9 (when it is not on the board) & PCB pads with PQ9 removed.

        Do not power up the logic board.

        c) Did you replace only PQ9 with the AO4496 ? No other mosfet has been replaced ?

        Comment

        • mo000
          Badcaps Veteran
          • Nov 2017
          • 274
          • algeria

          #5
          Re: ACER e1-531 not charging .

          Originally posted by mon2
          Wow. From the posted resistance values, each mosfet appears to be defective.

          Try the following:

          a) remove PQ9 off the logic board. Then measure the resistance again for the removed mosfet. Are the readings much different of the removed component ?

          b) with PQ9 removed - check the resistance of the PCB pads where PQ9 was soldered.

          Post the values of PQ9 (when it is not on the board) & PCB pads with PQ9 removed.

          Do not power up the logic board.

          c) Did you replace only PQ9 with the AO4496 ? No other mosfet has been replaced ?
          the problem solved
          i replace pq9 and pq10 with AO4456
          the laptop charging fine
          thank you for help .

          Comment

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