HP BOARD LA-H323P (Not mofset again ?!)

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  • pc_okay
    Badcaps Veteran
    • May 2022
    • 239
    • FRANCE

    #1

    HP BOARD LA-H323P (Not mofset again ?!)

    Hello guys,

    I quadruple check my dc mofset and they are not leaking.
    But first one is giving me million and millions ohms in every ways (gate <> source <> drain <> gate) could it be this little b....?

    But I get not voltage after first mofset 0V, I get 0.95V after 2nd mofset.

    On my ic chip i get: (without battery)

    ACN 0.91
    ACP 0.91
    CMNSRC 0.38
    ACDRV 0.05
    ACOK 0
    ACDET 3.1
    IOUT 0
    SDA 0.1
    ILIM 0
    BATDRV 2.2
    SRN 0
    SRP 0
    GND 0
    LODRV 0
    RGN 5.
    BTST 5.7
    HIDRV 1.69
    PHASE 1.068
    VCC 19.58

    Thanks )
  • Answer selected by pc_okay at 10-09-2024, 02:53 AM.
    rogfanther
    Badcaps Veteran
    • Jul 2006
    • 458
    • Brazil

    ACOK shouldn´t be 0V. Check it again, also check its circuit.

    Comment

    • rogfanther
      Badcaps Veteran
      • Jul 2006
      • 458
      • Brazil

      #2
      ACOK shouldn´t be 0V. Check it again, also check its circuit.

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 13894
        • Canada

        #3
        What is the resistance to ground of ACN / ACP?

        Comment

        • pc_okay
          Badcaps Veteran
          • May 2022
          • 239
          • FRANCE

          #4
          Hello !!!

          Sorry guys, noob problem, I'm ashamed !

          I put my power supply to high (20V ~) and it was too much for the IC, the Overvoltage protection was running and ACOK was LOW because of it !
          Immediatly after lower the power supply to 19.5V the ACOK was high and everithing work now.
          Good to know and Thanks rogfanther​ for the clue.

          The problem was due to liquid damage on the keyboard, the keyboard is actually shorted to ground... Not a motherboard problem actually... bad diagnostic from my team.

          Thanks again and have a nice day.

          Comment

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