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HP Elitebook 850 G8 flashes capsl 7 times after bios un/resolder

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    HP Elitebook 850 G8 flashes capsl 7 times after bios un/resolder

    Hello all,

    I am trying to remove bios pw from this laptop so I desoldered, dumped and flashed and resoldered the chip on the back but ever since doing this caps lock just flashes 7 times, no fan no screen, also the charging/power light immediately comes on when connecting the battery.

    What do I do?

    #2
    The bios is the suspect. Confirm the bios contents and the soldering of this device. Post the details in the dedicated bios forum.

    Comment


      #3
      Originally posted by mon2 View Post
      The bios is the suspect. Confirm the bios contents and the soldering of this device. Post the details in the dedicated bios forum.
      I am about to remove the chip again and verify the flash. I'm tempted to solder the chip in afterwards on the jumper pads to see if that changes anything. Am using several layers of tinfoil heat shielding, so I'll have to remove that first :P

      Would pictures (before/after/other) be helpful here?

      Comment


        #4
        Check the seating of your ram.

        https://youtu.be/Na0kzRuCHBw?feature=shared

        Comment


          #5
          Originally posted by mon2 View Post
          Check the seating of your ram.

          https://youtu.be/Na0kzRuCHBw?feature=shared
          I already tried that.

          These pics are after soldering

          Comment


            #6
            See attached. Suggest to flux the sides of this flash device and then run your pencil soldering iron tip along these joints. The solder will then melt and rise up onto the flash device pads. We use a cone pencil tip at high heat and that works very well with Koki solder flux or similar.

            Click image for larger version

Name:	solder_joints.png
Views:	259
Size:	1.10 MB
ID:	3250018

            Comment


              #7
              Originally posted by mon2 View Post
              See attached. Suggest to flux the sides of this flash device and then run your pencil soldering iron tip along these joints. The solder will then melt and rise up onto the flash device pads. We use a cone pencil tip at high heat and that works very well with Koki solder flux or similar.

              Click image for larger version  Name:	solder_joints.png Views:	76 Size:	1.10 MB ID:	3250018
              Things have progressed... downhill..
              fn light on, no charging light, power button unresponsive 😱
              Ive measured across the board and all voltages seem to be there

              Comment


                #8
                Post an updated pic of the reworked areas.

                Comment


                  #9
                  Originally posted by mon2 View Post
                  Post an updated pic of the reworked areas.
                  Thank god for 64mp cameras

                  Comment


                    #10
                    Originally posted by mon2 View Post
                    Post an updated pic of the reworked areas.
                    Any thoughts?

                    Comment


                      #11
                      Missing resistor close to pin nr 5

                      Comment


                        #12
                        Originally posted by romky View Post
                        Missing resistor close to pin nr 5
                        By any chance you know the ratings of this resistor (and possibly circle where it should go)? Could I just bridge the two points?

                        Comment


                          #13
                          If i remember correctly it was the same as the one next to it

                          Comment


                            #14
                            If you dont know the rating, try with 33 ohms resistor.

                            Comment


                              #15
                              Originally posted by romky View Post
                              If i remember correctly it was the same as the one next to it
                              Having trouble pinpointing the location on the pcb, if you could point it out on the pic(s) I included earlier I would be very grateful 🖤

                              Originally posted by mcplslg123 View Post
                              If you dont know the rating, try with 33 ohms resistor.
                              I'll have to scavange something from other broken/unusable pcbs, most likely the motherboard from a dell Chromebook I got laying around lol

                              Comment


                                #16
                                Originally posted by romky View Post
                                If i remember correctly it was the same as the one next to it
                                I've been examining the area around the bios chip but I can't find the spot or it's companion resistor anywhere 😵

                                Comment

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