Hot Air Blew Away Resistors Near Bios

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  • brightest_z
    Member
    • Nov 2024
    • 17
    • USA
    #1

    Hot Air Blew Away Resistors Near Bios

    Hi All - I'm in the midst or reprogramming the bios on my gen1 Surface Laptop Studio and I accidentally blew away 2 resistors nearby the bios. I don't have another board to measure values of the missing resistors and schematics aren't available, bbut the bios is a 6x5mm Winbond WSON8, W25R256JWPQ model. The traces are conductive to Pins 3 and 7 (IO2 & IO3 respectively) so I have reason to believe they are 10k pull up resistors since IO2&3 pins are used for Quad SPI instructions.

    Does anyone with more knowledge, and experience than I, know if this is the case?

    Bios Spec Sheet - https://www.winbond.com/resource-fil...2009072018.pdf
    Attached Files
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14046
      • Canada
      #2
      Test if the one side of these missing parts mates to the vcc pin of this flash. If yes, then yes they are pull-up resistors.

      My database of schematics claims to have the boardview and schematics for this unit. However, unable to locate this flash part in the schematics.

      Can you post a larger view of this board and note the location of this flash device?

        Comment

        • brightest_z
          Member
          • Nov 2024
          • 17
          • USA
          #3
          Originally posted by mon2
          Test if the one side of these missing parts mates to the vcc pin of this flash. If yes, then yes they are pull-up resistors.

          My database of schematics claims to have the boardview and schematics for this unit. However, unable to locate this flash part in the schematics.

          Can you post a larger view of this board and note the location of this flash device?
          I'll test the VCC connectiona today, thank you!

          Here are the larger area shots
          Attached Files

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14046
              • Canada
              #4
              The boardview does not match the one in the database for Surface Laptop Studio 1. Could it be a different model?

                Comment

                • brightest_z
                  Member
                  • Nov 2024
                  • 17
                  • USA
                  #5
                  It could be the desktop Surface Studio 1 you have diagrams for. I was unable to find the laptop gen1 schematics anywhere

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14046
                      • Canada
                      #6
                      Yes but the flash is not the same.

                      Click image for larger version Name: flash2.png Views: 60 Size: 62.1 KB ID: 3527067

                      Click image for larger version Name: flash1.png Views: 0 Size: 82.9 KB ID: 3527065

                        Comment

                        • brightest_z
                          Member
                          • Nov 2024
                          • 17
                          • USA
                          #7
                          I see what you're saying. I looks like Pins 3 and 7 are the same on the W25Q128FV, only difference being it's 3v vs 1.8v on the W25R256JWPQ. 1K vs 10k could make bit of a mA difference but not by much. It seems low risk to try out 10k on both pad sets.
                          Attached Files

                            Comment

                            • mon2
                              Badcaps Legend
                              • Dec 2019
                              • 14046
                              • Canada
                              #8
                              Yes, 10k pull-ups are perfectly safe to place onto the pads you have shared.

                                Comment

                                • brightest_z
                                  Member
                                  • Nov 2024
                                  • 17
                                  • USA
                                  #9
                                  Many thanks!!

                                    Comment

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