Aspire 5741z power only on ac

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  • kingo71
    New Member
    • May 2013
    • 6
    • italy

    #1

    Aspire 5741z power only on ac

    Hi there, i have a strange issue with this laptop.

    It power up only if the ac is pluged in, even the battery will be charged and if i unplug the ac the laptop still working.

    Then with only battery doesn't power up.

    The board is a LA-5893P

    Thank you for any help.

    Bye.
  • highpulse
    i hate HP
    • May 2013
    • 1489
    • portugal

    #2
    Re: Aspire 5741z power only on ac

    seems to me a bad charger IC , or the mosfet related to state open/close of the battery . chek that first , for we can carrier forward for next solutions

    Comment

    • kingo71
      New Member
      • May 2013
      • 6
      • italy

      #3
      Re: Aspire 5741z power only on ac

      Thank you for your answer.

      If you already know this board, please tell me what ic to check.
      I have checked the pq42, maybe something related to VIN detector?
      The battery will charge, but no power on with only battery although the laptop stay on with only battery after power on with ac adapter.

      Thank you for any further help.

      Comment

      • lezsimply
        The Wanderer
        • Jan 2013
        • 645
        • Philippines

        #4
        Re: Aspire 5741z power only on ac

        have you checked rtc battery?

        Comment

        • kingo71
          New Member
          • May 2013
          • 6
          • italy

          #5
          Re: Aspire 5741z power only on ac

          Yes, seems to be ok, i can check RTCVREF and +RTCBATT and tell you the result

          Comment

          • atsio
            Badcaps Veteran
            • Oct 2013
            • 819
            • Greece

            #6
            Re: Aspire 5741z power only on ac

            Give voltage of PQ53 with only battery connected

            Comment

            • kingo71
              New Member
              • May 2013
              • 6
              • italy

              #7
              Re: Aspire 5741z power only on ac

              Hi, thank you for support.

              Well, on PQ53 i have these values:

              on pin 1,2,3 the +B (12,38 with my battery)
              on pin 4 0V (without ac pluged)
              on pin 5,6,7,8 BATT+ (12,38 V)

              Thank you in advance for any help.

              Comment

              • kingo71
                New Member
                • May 2013
                • 6
                • italy

                #8
                Re: Aspire 5741z power only on ac

                Any advice?

                Comment

                • atsio
                  Badcaps Veteran
                  • Oct 2013
                  • 819
                  • Greece

                  #9
                  Re: Aspire 5741z power only on ac

                  What is the voltage on PQ42 and PU14?

                  Comment

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