Hp - LA-A994P boot loop

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  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3553
    • slovakia

    #1

    Hp - LA-A994P boot loop

    Hello .
    Have this HP from my custommer that sudently stop and not work.
    Charging is ok, after power button start but after 4 seconds powerlight goes off


    i go through power on sequence on page 4 of schematic, but dont register that little low time after signal PBTN_OUT# goes on, and dont register any next signals.

    also found that CMOS battery have 0.0V i replaced it

    Now im trying to flash dumps. My rev is 2.0
    Attached Files
    Last edited by ktmmotocross; 02-10-2019, 03:03 PM.
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3553
    • slovakia

    #2
    Re: Hp - LA-A994P boot loop

    flashed all 4 bios dumps that i found here on forum but still the same

    Comment

    • smali
      Badcaps Veteran
      • Sep 2014
      • 287
      • Pakistan

      #3
      Re: Hp - LA-A994P boot loop

      Have you check short on 3&5vs and all vs line on schematic page no29?

      Comment

      • ktmmotocross
        Boardkiller
        • Feb 2014
        • 3553
        • slovakia

        #4
        Re: Hp - LA-A994P boot loop

        yes, no short

        Comment

        • khaahk
          Badcaps Veteran
          • Dec 2013
          • 743
          • Estonia

          #5
          Re: Hp - LA-A994P boot loop

          New cmos battery holds voltage ok?

          Comment

          • ktmmotocross
            Boardkiller
            • Feb 2014
            • 3553
            • slovakia

            #6
            Re: Hp - LA-A994P boot loop

            yes, no problem with it.

            i try to manually start EC_SLP_S4 and EC_SLP_S3 signals but SOC start to BURN

            Comment

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