Asus X450LC no power (no PM_SLP_S4#)

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  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France
    #1

    Asus X450LC no power (no PM_SLP_S4#)

    Hi,
    I don't have the laptop anymore, but I tried to diagnose an Asus X450LC this morning.
    At first, the power LED would light up after pressing power button, but nothing happened.
    I traced this back to a missing PM_SUSC# signal (PM_SLP_S4# coming from the PCH).
    PM_RSMRST# was present, there was 3.3V on the power button.
    I tried to flash the BIOS, same thing but now the power LED wouldn't even light up after pressing power button. Restored to the original BIOS, still no power LED.
    I didn't have the time to check any more than this, I especially didn't check the RTC circuit but since RSMRST was present, I hoped (probably wrongly) it was ok. The CR2032 was at 3.1V though, so it's ok.

    If anyones has an idea… It does not really matter anyway, the owner will probably replace the motherboard, but this still had me confused.

    Original BIOS, repair guide and boardview attached.

    Link to boardview & repair guide - https://www.badcaps.net/forum/troubl...d-repair-guide
    Last edited by SMDFlea; 03-28-2025, 04:18 AM. Reason: Link to boardview & repair guide
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
    Tags: None
    • caspian
      Badcaps Legend
      • Oct 2015
      • 1589
      • Laptop
      #2
      Re: Asus X450LC no power (no PM_SLP_S4#)

      it is possible that the SIO got damaged during your measurements, as it happened to me before.

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #3
          Re: Asus X450LC no power (no PM_SLP_S4#)

          I didn't measure on the SIO pin's directly, and the change in behaviour happened just after the BIOS flash. However this time I used a SOIC clip for in-system BIOS programming. That's the first time I try this on a laptop, and I had some difficulties to get the BIOS to be read at first. Maybe I did something wrong there. (though I checked multiple times that I didn't reverse the pinout)
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • caspian
              Badcaps Legend
              • Oct 2015
              • 1589
              • Laptop
              #4
              Re: Asus X450LC no power (no PM_SLP_S4#)

              I have read a similar problem during in-system BIOS programming yesterday in a thread that you have read too:
              www.badcaps.net/forum/showthread.php?t=66760

              It seems in-system BIOS programming will damage the mainboard sometimes, even if the adapter is connected properly to the Bios chip. this is probably because of the fact that SIO and other components which are connected to the Bios chip, are not made in a way to accept in-system BIOS programming. this is just my guess and I am not sure.

                Comment

                • zoltor
                  Member
                  • Nov 2016
                  • 30
                  • Казахстан
                  #5
                  Originally posted by caspian
                  Re: Asus X450LC no power (no PM_SLP_S4#)

                  I have read a similar problem during in-system BIOS programming yesterday in a thread that you have read too:
                  www.badcaps.net/forum/showthread.php?t=66760

                  It seems in-system BIOS programming will damage the mainboard sometimes, even if the adapter is connected properly to the Bios chip. this is probably because of the fact that SIO and other components which are connected to the Bios chip, are not made in a way to accept in-system BIOS programming. this is just my guess and I am not sure.
                  I think modern SPI Ic's are designed for 1.8 volts, when you connect the programmer it can supply 3.3 volts to this line. This can damage the elements in this chain. I never use in-circuit programming and do not recommend it to you.

                    Comment

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