laptop ideapad 3-15IML05 Laptop - Type 81WB

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  • mazloum
    Badcaps Veteran
    • Sep 2012
    • 499
    • Lebanon
    #1

    laptop ideapad 3-15IML05 Laptop - Type 81WB

    Hi, I have this laptop ideapad 3-15IML05 Laptop - Type 81WB,
    serial number: PF3DN87L
    MTM: 81WB010DAX
    board: GS452/GS552/GS752 NM-C781 Rev:1.0 2019-11-25
    the problem is it powers up for10 seconds, no fans no picture then powers off, after few seconds it powers on by itself, also no display and then off, i found u4401 burnt , i removed it because i did not find it
    Click image for larger version Name: image.png Views: 0 Size: 36.0 KB ID: 3179785
    3v and 5v are both present, 3.3v is present on bios, i reprogrammed bios with no success
    Last edited by mazloum; 01-16-2024, 10:33 AM.
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Resistance to GND on pin5/4/1 of U4401?

        Comment

        • mazloum
          Badcaps Veteran
          • Sep 2012
          • 499
          • Lebanon
          #3
          Originally posted by mcplslg123
          Resistance to GND on pin5/4/1 of U4401?
          pin5= 139 ohm
          pin 4= 100 kohm
          pin 1= 9 m ohm

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Pin5 resistance is too low-Should be in Kohms range.

                Comment

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