HP Zbook 15 G2 laptop won't turn off completely

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  • RODAKSAN
    Member
    • Jun 2022
    • 17
    • Mexico
    #1

    HP Zbook 15 G2 laptop won't turn off completely

    Hi everyone, I have a HP Zbook 15 G2 with some issue, it won't turn off completely. Once you turn it off by OS or Manually, the screen goes off, but the fan goes crazy at full RPM and it don't stop until the battery is drained. It is not a OS issue, the laptop does not turn off with or without OS. May be a thermal issue?

    Motherboard:LA-B381P with latest BIOS version, OS works normally, no faulty devices found on HP diags.
    It has new thermal compound and clean fans.
    Found no burned components on visual inspection.
    Holding the power button does not work, it keeps blowing air.

    Please help, I already have the schematics and the tools to do a rework.

    Best regards
    Last edited by RODAKSAN; 06-20-2022, 10:30 AM.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13840
      • Canada
      #2
      Re: HP Zbook 15 G2 laptop won't turn off completely

      Power down and remove the wifi module and test again.
      Attached Files

        Comment

        • RODAKSAN
          Member
          • Jun 2022
          • 17
          • Mexico
          #3
          Re: HP Zbook 15 G2 laptop won't turn off completely

          Thank you mon2 ,
          I removed the wifi module, same issue; once you plugged in the Battery charger, it starts to blow air, if you turn it on, the fan works normally until you turn off the book and then goes crazy again

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13840
              • Canada
              #4
              Re: HP Zbook 15 G2 laptop won't turn off completely

              Do you get the crazy fan spin if running from battery only ?

                Comment

                • RODAKSAN
                  Member
                  • Jun 2022
                  • 17
                  • Mexico
                  #5
                  Re: HP Zbook 15 G2 laptop won't turn off completely

                  same issue with both only battery powered and battery charger powered (original 120W)

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13840
                      • Canada
                      #6
                      Re: HP Zbook 15 G2 laptop won't turn off completely

                      What is the voltage of pin # 2 (TACH_FAN_IN) on JFAN1 connector when the fan is normal speed ?

                      What is the voltage of this pin when the fan is in crazy spin mode ?

                      The fan speed is decided by the SMC @ U17. This component sends out the stream (pin 121) of the PWM signal to speed up or slow down the fan.

                        Comment

                        • RODAKSAN
                          Member
                          • Jun 2022
                          • 17
                          • Mexico
                          #7
                          Re: HP Zbook 15 G2 laptop won't turn off completely

                          ACH_FAN_IN 3.3v, zbook turned on with no fan movement, it starts to spin seconds later
                          ACH_FAN_IN 1.72v, in normal speed
                          ACH_FAN_IN 1.72v, fan at full speed (zbook powered off)

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india
                              #8
                              Re: HP Zbook 15 G2 laptop won't turn off completely

                              This happens 'coz your VS lines are not not switched off even after turning off from windows. Check your dc-dc converter for 3V/5V VS .(U45/U46)

                                Comment

                                • RODAKSAN
                                  Member
                                  • Jun 2022
                                  • 17
                                  • Mexico
                                  #9
                                  Re: HP Zbook 15 G2 laptop won't turn off completely

                                  Thank you mcplslg123!! I found u45 burned, now I'm looking for a replacement. Once u45 replaced, I will post the result.
                                  Best Regards
                                  Attached Files

                                    Comment

                                    • RODAKSAN
                                      Member
                                      • Jun 2022
                                      • 17
                                      • Mexico
                                      #10
                                      Re: HP Zbook 15 G2 laptop won't turn off completely

                                      Success!! I replaced the U45, brand new part from china (take so long time to get here :p) but the laptop works again normally. Thank you all who helped me, specially to mcplslg123

                                        Comment

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