Surface 7 - missing S3 sleep signal, S4 present but weird

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  • Prott
    Senior Member
    • May 2022
    • 154
    • Czechia
    #1

    Surface 7 - missing S3 sleep signal, S4 present but weird

    Hey fellow Badcappers
    I am troubleshooting Surface 7 board (rev 1.0) which was working great until it experienced a short circuit due to a bad screen.

    Now it's missing SLP_S3 signal. Everything in the power on sequence works properly up until that signal.

    - The resistance to ground on the SLP_S3 line is >50 kOhms.
    - No shorts on any powerrails that I can find.
    - I get a proper clock signal on the RTC crystal (XTAL_2P) once the Surface gets power.
    - SLP_S4 is, suprisingly, present, but it looks very weird (jump up to 2 V for about 10 ns and then plummets down to under 1 V).

    Do you have any idea or experience with similar issue? Thank you
    Tags: None
    • Prott
      Senior Member
      • May 2022
      • 154
      • Czechia
      #2
      Re: Surface 7 - missing S3 sleep signal, S4 present but weird

      UPDATE: It was a bios issue.

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