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HP EliteBook 850 G1

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    HP EliteBook 850 G1

    Does not power on after shutdown.
    Unless all power is removed beforehand.
    Cmos battery is removed.
    Battery is removed.
    Power adapter is unplugged.

    Once done
    Insert cmos battery
    Main Battery
    Power Adapter at this step system will power on complain about cmos reboot and boot into windows.

    If restarted will work normally.

    If shutdown/powered off will not power back on. unless above steps are done.
    My pc
    CPU : AMD PHENOM II x4 @ 3.5Ghz
    MB : ASUS M4A89TD PRO USB3
    RAM : Kingston ValueRAM 16gb DDR3
    PSU : Cooler Master 850W Silent Pro
    GPU : ATI Radeon HD 6850

    #2
    Re: HP EliteBook 850 G1

    have you changed any Bios option recently or updated the Bios recently?
    remove the main battery and let the problem occur again. Then, check whether all voltage rails are present or not.

    Comment


      #3
      Re: HP EliteBook 850 G1

      Have you tested the cmos battery voltage
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment


        #4
        Re: HP EliteBook 850 G1

        Tried new CMOS battery.
        Tried without HDD.
        Updated BIOS to newest.
        Tried with only power adapter.

        I don't think any rails apart from cmos sram will be powered from cmos battery.
        I just don't get why cmos has to be cleared for it to turn on.

        unless on power off it enters some weird state.
        My pc
        CPU : AMD PHENOM II x4 @ 3.5Ghz
        MB : ASUS M4A89TD PRO USB3
        RAM : Kingston ValueRAM 16gb DDR3
        PSU : Cooler Master 850W Silent Pro
        GPU : ATI Radeon HD 6850

        Comment


          #5
          Re: HP EliteBook 850 G1

          It is possible that a bad Bios update has caused such a problem. Or, it is also possible that some component on the Bios circuit has got faulty. Or, it is also possible that SIO or PCH manipulates Bios content due to a faulty operation.

          Comment


            #6
            Re: HP EliteBook 850 G1

            If you have schematic, then look at kbc page and findout the switching pin and check whether you have 3v there. If 3v is present, try directly switching from that kbc pin by shorting it to gnd. That will rule out any bad circuit or traces in between kbc and power switch.

            Btw, if schematic not avlbl, then try to findout another schematic with kbc and get the pinout from there.

            Comment


              #7
              Re: HP EliteBook 850 G1

              I mean another schematic with same kbc.

              Comment


                #8
                Re: HP EliteBook 850 G1

                Originally posted by caspian View Post
                It is possible that a bad Bios update has caused such a problem. Or, it is also possible that some component on the Bios circuit has got faulty. Or, it is also possible that SIO or PCH manipulates Bios content due to a faulty operation.
                Updated bios in attempt to correct issue. old bios was from 2015.

                I was initially thinking windows was putting pc in a odd power state but eliminated that theory by using shutdown feature in bios.
                My pc
                CPU : AMD PHENOM II x4 @ 3.5Ghz
                MB : ASUS M4A89TD PRO USB3
                RAM : Kingston ValueRAM 16gb DDR3
                PSU : Cooler Master 850W Silent Pro
                GPU : ATI Radeon HD 6850

                Comment


                  #9
                  Re: HP EliteBook 850 G1

                  Well i set bios to power on machine at a specific time and it did.
                  I found a schematic.
                  I have found,

                  Power button
                  Lid Switch
                  Power LED

                  All don't work.

                  Page 62 of HP ElitBook_840_G1_6050A2559101.pdf Is the board.

                  Seems like P3V3AL_PB is missing from the switch board.

                  The flat flex may be damaged or unplugged.

                  I led myself down the wrong path thinking is must be CMOS
                  Attached Files
                  My pc
                  CPU : AMD PHENOM II x4 @ 3.5Ghz
                  MB : ASUS M4A89TD PRO USB3
                  RAM : Kingston ValueRAM 16gb DDR3
                  PSU : Cooler Master 850W Silent Pro
                  GPU : ATI Radeon HD 6850

                  Comment


                    #10
                    Re: HP EliteBook 850 G1

                    "I led myself down the wrong path thinking is must be CMOS"

                    I`ve been down that same well trodden path many times .

                    Thanks for the schematics
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment


                      #11
                      Re: HP EliteBook 850 G1

                      found issue some minor corrosion and the cable had unplugged itself.
                      My pc
                      CPU : AMD PHENOM II x4 @ 3.5Ghz
                      MB : ASUS M4A89TD PRO USB3
                      RAM : Kingston ValueRAM 16gb DDR3
                      PSU : Cooler Master 850W Silent Pro
                      GPU : ATI Radeon HD 6850

                      Comment


                        #12
                        Re: HP EliteBook 850 G1

                        hi,
                        hp elitebook 850 g1
                        H5G42E to
                        CNU408B36F
                        I use
                        I have to reset the bios password
                        I removed the bios battery
                        i will be glad if you can help
                        Thank you in advance for your support

                        Comment


                          #13
                          Re: HP EliteBook 850 G1

                          Originally posted by ikaragozlu View Post
                          hi,
                          hp elitebook 850 g1
                          H5G42E to
                          CNU408B36F
                          I use
                          I have to reset the bios password
                          I removed the bios battery
                          i will be glad if you can help
                          Thank you in advance for your support
                          What is the issue u?
                          My pc
                          CPU : AMD PHENOM II x4 @ 3.5Ghz
                          MB : ASUS M4A89TD PRO USB3
                          RAM : Kingston ValueRAM 16gb DDR3
                          PSU : Cooler Master 850W Silent Pro
                          GPU : ATI Radeon HD 6850

                          Comment

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