hp elitebook 840 g3 no power / 3v 5v missing

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  • dqtech
    Badcaps
    • Jul 2018
    • 629
    • N/A

    #1

    hp elitebook 840 g3 no power / 3v 5v missing

    3v and 5v is missing but do have 19v on pin 1 on 3v 5v ic....19v present on first mosfet until resistor...please do advice how to check this motherboard....here i attach schematic that i found on internet
    Attached Files
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14046
    • Canada

    #2
    Can you post the schematic inside the schematic forum and link it here?

    Check the EN pins for the proper voltage to ground on the missing voltage regulators rails.

    Comment

    • dqtech
      Badcaps
      • Jul 2018
      • 629
      • N/A

      #3
      Originally posted by mon2
      Can you post the schematic inside the schematic forum and link it here?

      Check the EN pins for the proper voltage to ground on the missing voltage regulators rails.
      here the schematic sir https://www.badcaps.net/filedata/fetch?id=3465844

      https://www.badcaps.net/forum/troubl...atic-boardview

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14046
        • Canada

        #4
        Review U6100.

        Measure the voltage to ground of VREG3 and VREG5 LDO rails. Are they present and stable?

        Comment

        • dqtech
          Badcaps
          • Jul 2018
          • 629
          • N/A

          #5
          Originally posted by mon2
          Review U6100.

          Measure the voltage to ground of VREG3 and VREG5 LDO rails. Are they present and stable?
          sorry sir i just figure out this schematic is not match for motherboard....because i dint find TPS51225 ic on the motherboard....what i can say this is 3v and 5v area...but both have no voltage at all....when i test pin 1 on that 3v and 5v ic, it does have 19v appear
          Attached Files

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          • dqtech
            Badcaps
            • Jul 2018
            • 629
            • N/A

            #6
            i measure EN on that 2ic (which is pin 11), both read 1.6v .....LDO (which is pin 6) on 5v ic read 4.98v, LDO (which is pin 6) on 3v ic read 3.3v
            Attached Files
            Last edited by dqtech; 12-03-2024, 08:57 AM.

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            • dqtech
              Badcaps
              • Jul 2018
              • 629
              • N/A

              #7
              any solution guys?

              Comment

              • dqtech
                Badcaps
                • Jul 2018
                • 629
                • N/A

                #8
                Originally posted by dqtech
                i measure EN on that 2ic (which is pin 11), both read 1.6v .....LDO (which is pin 6) on 5v ic read 4.98v, LDO (which is pin 6) on 3v ic read 3.3v
                hi, im still looking for this solution

                Comment

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