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Hot Air Blew Away Resistors Near Bios

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    #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
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    #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?

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      #3
      Originally posted by mon2 View Post
      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

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        #4
        The boardview does not match the one in the database for Surface Laptop Studio 1. Could it be a different model?

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          #5
          It could be the desktop Surface Studio 1 you have diagrams for. I was unable to find the laptop gen1 schematics anywhere

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            #6
            Yes but the flash is not the same.

            Click image for larger version Name: flash2.png Views: 49 Size: 62.1 KB ID: 3527067

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

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              #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

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                #8
                Yes, 10k pull-ups are perfectly safe to place onto the pads you have shared.

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                  #9
                  Many thanks!!

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