Lenovo T400 fails POST

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  • mlefebvre
    New Member
    • Apr 2017
    • 5
    • Colombia
    #1

    Lenovo T400 fails POST

    Dear all,
    I have a T400 that turns on, briefly displays the boot up screen and suddenly shuts off without beeping. I've checked during the time that's on and, as far as I can see, all voltages (including VCCCPUCORE) are present.
    Quite strangely, if I press on the VGA chip while it's booting, the screen keeps turn on longer but never completes/passes POST nor it shows nothing different.
    At this point I'm inclined to think that there's an issue with the BIOS chip or the VGA one, but I'm not sure how to diagnose them.
    What will you suggest?

    Thanks!
    Tags: None
    • mlefebvre
      New Member
      • Apr 2017
      • 5
      • Colombia
      #2
      Re: Lenovo T400 fails POST

      No ideas?

        Comment

        • ala_borbe
          aka Donald
          • Apr 2011
          • 1625
          • Malta
          #3
          Re: Lenovo T400 fails POST

          cold joint on some of larger bga chips... when you press board you bent it (flex it) so it helps to either make better connections or loose connection somewhere

          put some flux, reflow and see how it is going
          Im Back... sort of...

            Comment

            • mlefebvre
              New Member
              • Apr 2017
              • 5
              • Colombia
              #4
              Re: Lenovo T400 fails POST

              I will, thanks!

                Comment

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