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HP EliteBook 8760w - No CPU VCore

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    HP EliteBook 8760w - No CPU VCore

    Hi, I've got a HP EliteBook 8760w with no CPU VCore, L6, L7, L8 all have no Vcore voltage. VCCSA is present. What should I check next? thanks
    Attached Files
    Last edited by Johndill; 06-16-2018, 04:10 PM.

    #2
    Re: HP EliteBook 8760w - No CPU VCore

    Check enable signal on U1010 pin 7.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: HP EliteBook 8760w - No CPU VCore

      Originally posted by piernov View Post
      Check enable signal on U1010 pin 7.
      If I counted right, U1010 pin 7 is 0.0mV

      Comment


        #4
        Re: HP EliteBook 8760w - No CPU VCore

        Originally posted by Johndill View Post
        If I counted right, U1010 pin 7 is 0.0mV
        Then check PWR_GOOD_3. Pin 4 U1012 should be 3 volts.

        Comment


          #5
          Re: HP EliteBook 8760w - No CPU VCore

          Originally posted by Francisco.s View Post
          Then check PWR_GOOD_3. Pin 4 U1012 should be 3 volts.
          According to the data sheet for pin arrangement, U1012
          pin 1 is 3.3V
          pin 2 is 1.4mV
          pin 3 is 0.0mV
          pin 4 is 0.0mV
          pin 5 is 3.3V
          Attached Files
          Last edited by Johndill; 06-21-2018, 05:36 AM.

          Comment


            #6
            Re: HP EliteBook 8760w - No CPU VCore

            Bump

            Comment


              #7
              Re: HP EliteBook 8760w - No CPU VCore

              What should I check next?

              Comment


                #8
                Re: HP EliteBook 8760w - No CPU VCore

                Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
                Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                Comment


                  #9
                  Re: HP EliteBook 8760w - No CPU VCore

                  Originally posted by piernov View Post
                  Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
                  Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
                  Yes the MXM GPU was connected, I'll check again without it

                  Comment


                    #10
                    Re: HP EliteBook 8760w - No CPU VCore

                    Originally posted by piernov View Post
                    Apparently PGOOD_MXM is needed for PWR_GOOD_3 to go high and get the CPU power regulator to turn on. PGOOD_MXM comes from the MXM connector apparently, and has a pull-up resistor to +V3S.
                    Is there a graphics card plugged in in the MXM connector? If there is, remove it, it may be pulling down the line (for an unknown reason right now).
                    With MXM GPU in, L6, L7 and L8 are 0.0mV, cold CPU.

                    With MXM GPU removed, L6, L7 and L8 are open line, hot CPU, PWR_GOOD_3 pin 4 U1012 is 3.3 volts.
                    Last edited by Johndill; 07-12-2018, 02:26 AM.

                    Comment


                      #11
                      Re: HP EliteBook 8760w - No CPU VCore

                      Is the computer booting without the MXM graphics card? Try to see if there is any HDD activity, any sound coming out from the speakers, if caps lock/num lock trigger the associated LED.

                      This MXM graphics card seems to be pulling down the PWRGD line so try with another graphics card if you have one.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                      Comment


                        #12
                        Re: HP EliteBook 8760w - No CPU VCore

                        Originally posted by piernov View Post
                        Is the computer booting without the MXM graphics card? Try to see if there is any HDD activity, any sound coming out from the speakers, if caps lock/num lock trigger the associated LED.

                        This MXM graphics card seems to be pulling down the PWRGD line so try with another graphics card if you have one.
                        If I remember correctly, the caps lock was flashing 5 times with the GPU in.

                        The caps lock stays solid lit without the GPU connected so would it be right to say the motherboard is fine and the issue would be with the GPU?

                        I have a GTX 675M in my Alienware but don't really want to take it out :-)

                        Comment


                          #13
                          Re: HP EliteBook 8760w - No CPU VCore

                          Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

                          You'd have to try with another graphics card to make sure it is indeed the issue.
                          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                          Comment


                            #14
                            Re: HP EliteBook 8760w - No CPU VCore

                            Originally posted by piernov View Post
                            Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

                            You'd have to try with another graphics card to make sure it is indeed the issue.
                            Thank you in advance for your help :-)

                            The caps lock was solid lit and did not turn off when pressed.

                            I'll clean it out and reassemble it for easier testing of your suggestions and replay back some time soon when I have completed your tests and maybe bear it and try out the GTX 675M from my Alienware as it's the only working MXM card I have and unfortunately HP didn't enable the intel integrated GPU on this board.
                            Last edited by Johndill; 07-13-2018, 06:58 AM.

                            Comment


                              #15
                              Re: HP EliteBook 8760w - No CPU VCore

                              Originally posted by piernov View Post
                              Check if you can turn off/on the caps lock light. Put an hard drive with an operating system and check if it's being read. (you should hear the heads moving at least)

                              You'd have to try with another graphics card to make sure it is indeed the issue.
                              Problem solved! I put my Alienware GTX 675M in it and it now boots and displays, is there a way of troubleshooting the MXM card or could I heat it up with a hot air reflow station and see of that will work?
                              Attached Files
                              Last edited by Johndill; 07-13-2018, 09:24 AM.

                              Comment


                                #16
                                Re: HP EliteBook 8760w - No CPU VCore

                                Great!
                                Could you take pictures of the dead MXM card?
                                OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                Comment


                                  #17
                                  Re: HP EliteBook 8760w - No CPU VCore

                                  Originally posted by piernov View Post
                                  Great!
                                  Could you take pictures of the dead MXM card?
                                  It's a Quadro 3000M
                                  Attached Files

                                  Comment


                                    #18
                                    Re: HP EliteBook 8760w - No CPU VCore

                                    MXM graphics cards has 3 different versions which are probably not compatible. In addition, if you buy a MXM card, it can not be trusted. Thus, finding and buying a compatible MXM card takes time.
                                    to test the old card, first check whether the tantalum capacitors or the coils are shorted or not. but probably, the gpu chip should be failed.
                                    Last edited by caspian; 07-13-2018, 12:23 PM.

                                    Comment


                                      #19
                                      Re: HP EliteBook 8760w - No CPU VCore

                                      Its MXM3.0b . http://forum.notebookreview.com/thre...581056/page-72
                                      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                      Comment


                                        #20
                                        Re: HP EliteBook 8760w - No CPU VCore

                                        Originally posted by SMDFlea View Post
                                        Thanks, it looks like regular GTX cards will work with driver mods

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