Attempting to repair HP 15-f387wm

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  • Grey Beard
    New Member
    • Oct 2020
    • 4
    • United States

    #1

    Attempting to repair HP 15-f387wm

    HP laptop charger light on, but won't turn on.
    I have checked; charger - Good
    19.6 volt path - Good thru all sub power supplies.
    3.3 volt - Present at IO.
    Tried Mobo in & out with nothing connected but - old then new, power button - Dead.
    Stumped.
  • stingerchamp
    Badcaps Veteran
    • Sep 2020
    • 425
    • Pakistan

    #2
    Re: Attempting to repair HP 15-f387wm

    Originally posted by Grey Beard
    HP laptop charger light on, but won't turn on.
    I have checked; charger - Good
    19.6 volt path - Good thru all sub power supplies.
    3.3 volt - Present at IO.
    Tried Mobo in & out with nothing connected but - old then new, power button - Dead.
    Stumped.
    Hi, is this dau99vmb6a0 rev a motherboard?


    Dont listen to the Nay sayerssS
    Last edited by stingerchamp; 10-29-2020, 09:49 AM. Reason: Dont listen to the Nay sayerssS

    Comment

    • Grey Beard
      New Member
      • Oct 2020
      • 4
      • United States

      #3
      Re: Attempting to repair HP 15-f387wm

      Yes, it is the DAU99VMB6A0 Rev-A Mobo.

      Comment

      • stingerchamp
        Badcaps Veteran
        • Sep 2020
        • 425
        • Pakistan

        #4
        Re: Attempting to repair HP 15-f387wm

        Originally posted by Grey Beard
        Yes, it is the DAU99VMB6A0 Rev-A Mobo.
        Hi ,

        Do the hard reset and check

        1-Push Power button on for the 20 sec while no charger plugin and after wait for 20 sec plugin and try to turn on the laptop .
        2- remove accessories and remove battery and remove RTC battery and wait for 30min and then put it back and try to turn on with power charger plugin alone
        Last edited by stingerchamp; 10-30-2020, 06:30 AM.

        Comment

        • Grey Beard
          New Member
          • Oct 2020
          • 4
          • United States

          #5
          Re: Attempting to repair HP 15-f387wm

          Sorry for the delay. I did as you suggested & still nothing.

          Comment

          • stingerchamp
            Badcaps Veteran
            • Sep 2020
            • 425
            • Pakistan

            #6
            Re: Attempting to repair HP 15-f387wm

            Do you have schematic for this motherboard?
            Does laptop turn on with only battery connected?

            Have you tried CMOS reset by holding
            Win+ v with power button for 2 sec then release power button only but keep holding win+ v until CMOS is invalid option display on your screen. Reset bios

            Do you have schematic so we look for fault using schematic.?

            When you get schematic check AD_id pin voltage
            If you have 90 watt charger it should be around 1.25
            For 45w it is .47 Voltage. For 150 watt it should be around 2.5 , I am not sure for the 150 watt.

            Check power button voltage it should be 3.3 before pressing and 0 after press/holding.

            3 voltage rail is present or not, 5 voltage rail.

            Check Suspend voltage ( not present)or always (present) before .

            Do you have voltage on rtc cell it should be above 2.8 Vol.

            Comment

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