HP EliteBook 8460p turn on problem

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • DeniS182
    Badcaps Veteran
    • Jun 2014
    • 328
    • Slovakia

    #1

    HP EliteBook 8460p turn on problem

    Hi,
    I have problem with this laptop. After power on button is pressed laptop start and instantly goes off. When I remove main battery and CMOS battery for a while laptop starts normally and work all the day. I tried flash bios with tool from HP website and it tooks too long time approximately 6 Hours for saving old bios and 6 hours for flashing new one. Bios Is latest now. And CMOS battery has only 2.6v I replaced it.

    But problem is still here.. can someone help me with this? Mobo looks fine no water damage..

    Thanks
  • DeniS182
    Badcaps Veteran
    • Jun 2014
    • 328
    • Slovakia

    #2
    Re: HP EliteBook 8460p turn on problem

    Pictures
    Attached Files

    Comment

    • caspian
      Badcaps Legend
      • Oct 2015
      • 1589
      • Laptop

      #3
      Re: HP EliteBook 8460p turn on problem

      Bios chip must be programmed only using a hardware-based programmer out of the laptop maiboard.
      You should test the laptop in more situations. For example when the laptop works fine, check what will happen if you reinsert the two batteries and then turn the laptop off and on?
      Check how long this fine working lasts if you turn the laptop off and on after a while?
      Last edited by caspian; 05-21-2020, 02:04 PM.

      Comment

      • DeniS182
        Badcaps Veteran
        • Jun 2014
        • 328
        • Slovakia

        #4
        Re: HP EliteBook 8460p turn on problem

        I have bios programmer , but when system works I flashed it through Windows ..
        Fault Is not depend on main battery.. problem Is here without main battery also. Laptop works fine/without main battery/, then I turn it off and next startup laptop post but after 1 second turn off. Then I remove bios battery for few seconds, put it back and laptop works again.

        Comment

        • caspian
          Badcaps Legend
          • Oct 2015
          • 1589
          • Laptop

          #5
          Re: HP EliteBook 8460p turn on problem

          If you program Bios using an external programmer, you can verify whether the bios chip is defective or not.

          Comment

          • DeniS182
            Badcaps Veteran
            • Jun 2014
            • 328
            • Slovakia

            #6
            Re: HP EliteBook 8460p turn on problem

            I read bios dump by external programmer now. I upload it in right section in forum and ask someone to help me with check it or clean ME region , fix my bios file..and then I write new dump to chip and test..

            Comment

            • DeniS182
              Badcaps Veteran
              • Jun 2014
              • 328
              • Slovakia

              #7
              Re: HP EliteBook 8460p turn on problem

              I try clean ME region using Intel Easy Clean Me software. Laptop with this dump POST, but shutdown problem is still here. After 1-2 sec laptop turn off by itself.

              Comment

              • caspian
                Badcaps Legend
                • Oct 2015
                • 1589
                • Laptop

                #8
                Re: HP EliteBook 8460p turn on problem

                Does it display anything on the screen before shutting down?

                Comment

                • DeniS182
                  Badcaps Veteran
                  • Jun 2014
                  • 328
                  • Slovakia

                  #9
                  Re: HP EliteBook 8460p turn on problem

                  Yes, HP logo for a while and then goes off.

                  Comment

                  • nova100
                    Member
                    • Feb 2017
                    • 35
                    • Egypt

                    #10
                    Re: HP EliteBook 8460p turn on problem

                    i had same proplem i solved by heating on cpu soket using bga machine and changed the cpu core caps

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india

                      #11
                      Re: HP EliteBook 8460p turn on problem

                      It could be RTC circuit issue ,Bios issue. If you have schematic post it here.

                      Comment

                      • DeniS182
                        Badcaps Veteran
                        • Jun 2014
                        • 328
                        • Slovakia

                        #12
                        Re: HP EliteBook 8460p turn on problem

                        I have this schematic
                        Attached Files

                        Comment

                        • caspian
                          Badcaps Legend
                          • Oct 2015
                          • 1589
                          • Laptop

                          #13
                          Re: HP EliteBook 8460p turn on problem

                          Now let the laptop stays in the problematic state and do not remove the CMOS battery. Then, according to Page26 of the schematics, measure all RTC-related voltages to see which one is not correct.

                          Comment

                          • DeniS182
                            Badcaps Veteran
                            • Jun 2014
                            • 328
                            • Slovakia

                            #14
                            Re: HP EliteBook 8460p turn on problem

                            I measure voltages on d10 in the problem state and voltages are correct. Its there other voltages to measure? Thanks

                            Comment

                            • caspian
                              Badcaps Legend
                              • Oct 2015
                              • 1589
                              • Laptop

                              #15
                              Re: HP EliteBook 8460p turn on problem

                              If all the three pins of D10 are correct, then the RTC circuit is probably fine. Then, you should check which Bios setting leads to the unexpected shutting down. Disabling some Bios option may prevent the shut down.

                              Comment

                              Related Topics

                              Collapse

                              • masoksian
                                Dell latitude e7470 not turn on .power buton on off and Run Power problem
                                by masoksian
                                Hi everyone,

                                I am dealing with the problem of turning on and off my Dell e7470 notebook.

                                The battery charge light is solid white, I press the button, the power indicator and the light on the button are solid for 1-2 seconds and immediately turn off.

                                The system does not turn on, there is no post.

                                I removed the RAMs and changed them, changed the battery, RTC battery, AC adapter, removed them and waited, tried again, it does not turn on.
                                The problem continues in the same way.
                                I tried to turn on the Fn key, nothing came to the screen....
                                02-15-2025, 12:08 PM
                              • PacoGT
                                HELP!! Dell E6440 laptop with problem does not turn off and turn itself on help
                                by PacoGT
                                A few days ago my laptop gave me problems, when I wanted to turn it on to my surprise without charging so I did not put much importance on it, after that I turned it on with a charger, it turned on and charged the laptop, the problem with the laptop is that when it is turned off it turns to turn on after seconds, sometimes at 2 or sometimes at 8, other than that it works normally, I already checked many things, I changed a mosfet at the charge input to a pnp but it remained the same, after that I checked and I did not find anything outside Normally, before that, it had a failure where I changed...
                                07-11-2023, 09:31 PM
                              • Document Archive
                                HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook 800 Specification for Upgrade or Repair
                                by Document Archive
                                This specification for the HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the EliteBook 860 16 inch G9 Notebook PC boardview and EliteBook 860 16 inch G9 Notebook PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that...
                                09-07-2024, 05:50 AM
                              • Document Archive
                                HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook 800 Specification for Upgrade or Repair
                                by Document Archive
                                This specification for the HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the EliteBook 860 16 inch G9 Notebook PC boardview and EliteBook 860 16 inch G9 Notebook PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that...
                                09-07-2024, 05:50 AM
                              • Document Archive
                                HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook 800 Specification for Upgrade or Repair
                                by Document Archive
                                This specification for the HP EliteBook EliteBook 860 16 inch G9 Notebook PC Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the EliteBook 860 16 inch G9 Notebook PC boardview and EliteBook 860 16 inch G9 Notebook PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that...
                                09-07-2024, 05:50 AM
                              • Loading...
                              • No more items.
                              Working...