HP Elitebook 8460p wont boot into bios screen

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  • ReeferMadness
    Member
    • Jan 2021
    • 10
    • Scotland
    #1

    HP Elitebook 8460p wont boot into bios screen

    Hi All - I have an HP Elitebook 8460p which failed during a bios update.

    The Motherboard No. is 6050A2398701-MB-A02 HSTNN-190C (UMA variant)

    The bios chip is a Winbond W25Q64FVSIG

    All I get at power on is a black screen and the corrupted bios signal (2 flashes of the Caps & Num lock LEDs). I've tried flashing the various bios dumps (from this website) to the Bios IC both in circuit and out but the problem stays the same as described.
    Can anyone give any pointers for next steps - am I fighting encryption keys stored on board the mobo, TPM etc?
    I noticed that the checksum changes for the on chip bios file after a failed boot - is it being written to by the mobo and invalidated or is it a sign of a failing bios ic?

    Really appreciate any help
    Tags: None
    • Techtiger
      Badcaps Legend
      • Oct 2014
      • 1601
      • france
      #2
      Re: HP Elitebook 8460p wont boot into bios screen

      how did you flash the bios ? did you dissemble the laptop & flash with the special BIOS tool ?

        Comment

        • ReeferMadness
          Member
          • Jan 2021
          • 10
          • Scotland
          #3
          Re: HP Elitebook 8460p wont boot into bios screen

          Hi - I used the Rayer SPI / parallel port wiring for all flashes both on and off board. I used both flashrom and the SPIPGM programs in a linux environment

            Comment

            • Techtiger
              Badcaps Legend
              • Oct 2014
              • 1601
              • france
              #4
              Re: HP Elitebook 8460p wont boot into bios screen

              Originally posted by ReeferMadness
              Hi - I used the Rayer SPI / parallel port wiring for all flashes both on and off board. I used both flashrom and the SPIPGM programs in a linux environment
              buy a bios programmer with the socket or the clip from eBay UK or Chine CH341A EZP2019 request a clean BIOS on the bios section your method of flashing bios not recommend

                Comment

                • ReeferMadness
                  Member
                  • Jan 2021
                  • 10
                  • Scotland
                  #5
                  Re: HP Elitebook 8460p wont boot into bios screen

                  Thanks for the advice - I'll get a proper programmer. Can a corrupt bios stop the laptop booting as I have experienced or would you expect (at the minimum) to be able to boot with errors coming up?

                    Comment

                    • Techtiger
                      Badcaps Legend
                      • Oct 2014
                      • 1601
                      • france
                      #6
                      Re: HP Elitebook 8460p wont boot into bios screen

                      Originally posted by ReeferMadness
                      Thanks for the advice - I'll get a proper programmer. Can a corrupt bios stop the laptop booting as I have experienced or would you expect (at the minimum) to be able to boot with errors coming up?
                      Yep most of the time when bios is corrupt computer will not respond to the PWRBTWN dead in condition but sometimes boots with no image

                        Comment

                        • ReeferMadness
                          Member
                          • Jan 2021
                          • 10
                          • Scotland
                          #7
                          Re: HP Elitebook 8460p wont boot into bios screen

                          Late (very!) update for anyone who also has this problem with 8460p. For me (as advised by techtiger) I got it resolved by using a proper programmer (Ch341a - which I modded for compatibility with the 8460p bios IC which uses 3V i/o).
                          I removed bios chip from mobo (dont know if its just me but in circuit programming was unreliable).
                          Next I programmed a full bios image to the bios IC with CH341a.
                          Refitted bios chip to mobo and it booted!
                          Many thanks for advice and good luck if anyone needs to do the same!

                            Comment

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