Compal LA-6901P : No power with battery alone

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  • dimah77
    Senior Member
    • Sep 2016
    • 147
    • ALGERIA

    #1

    Compal LA-6901P : No power with battery alone

    Hi;
    Having packard Bell with Compal LA-6901P With no power with battery.
    - BATERRY CHARGING OK
    - POWER ON WITH CHARGER ALONE : OK
    - POWER ON WITH BOTH CHARGER AND BATTERY : OK
    - POWER ON WITH BATTERY WITHOUT CHARGER : NO OK

    WITH CHARGER , ALL VOLTAGE ON PWR JUMPER ARE OK
    WITH BATTERY ONLY : 10v on ON/OFFBTN !!!!!
  • homeless_cz
    Member
    • Oct 2017
    • 18
    • Czech rep.

    #2
    Re: Compal LA-6901P : No power with battery alone

    Originally posted by dimah77
    WITH BATTERY ONLY : 10v on ON/OFFBTN !!!!!
    ??? You should have 3,3V on that button.

    Anyway here is schematic -> https://cdn.badcaps-static.com/pdfs/...a12dee6b89.pdf

    Focus on page 48 and check mosfet PQ5 and other parts related to its Gate.

    Comment

    • dimah77
      Senior Member
      • Sep 2016
      • 147
      • ALGERIA

      #3
      Re: Compal LA-6901P : No power with battery alone

      Originally posted by homeless_cz
      ??? You should have 3,3V on that button.

      Anyway here is schematic -> https://cdn.badcaps-static.com/pdfs/...a12dee6b89.pdf

      Focus on page 48 and check mosfet PQ5 and other parts related to its Gate.
      what voltages should i get on PQ9 pins with battery only ?

      Comment

      • homeless_cz
        Member
        • Oct 2017
        • 18
        • Czech rep.

        #4
        Re: Compal LA-6901P : No power with battery alone

        Both cases battery and adapter pin 3 is clear, GND, pins 1 and 2 almost 0. In battery mode PQ9 gets short pulse to base and it sets gate of PQ5 to GND via PR15 , this opens PQ5 to pass the battery voltage to system. When you plug adapter, then VIN = 19V which closes PQ5 via PR16.

        Comment

        • dimah77
          Senior Member
          • Sep 2016
          • 147
          • ALGERIA

          #5
          Re: Compal LA-6901P : No power with battery alone

          Originally posted by homeless_cz
          Both cases battery and adapter pin 3 is clear, GND, pins 1 and 2 almost 0. In battery mode PQ9 gets short pulse to base and it sets gate of PQ5 to GND via PR15 , this opens PQ5 to pass the battery voltage to system. When you plug adapter, then VIN = 19V which closes PQ5 via PR16.
          Thanx a lot,
          problem solved by changing PQ5

          Comment

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