Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3581
    • slovakia

    #1

    Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

    Hello.
    Have this Lenovo Thinkpad Edge 13 0217 that normally works but after two/three days it coul not start or when start it shows just logoand shuts down. i found that problem is NBSWON voltage wich goes to 1.5V. i do many things, even cut signal to switchboard and wire it to switch. things little improved but after few days it is back to 1.5V. cannot figure what can be source of this problem. maybe the KBC is bad.

    Schematic
    https://www.badcaps.net/forum/showthread.php?t=83451
  • kodox
    Badcaps Veteran
    • Jul 2017
    • 322
    • Indonesia

    #2
    Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

    i've just found same problem but it's on Acer board, i thought it was the KBC too but after searching the anomali i found that the 3v (used to pull up) track is somewhere broken in the middle layer of the board, so i tried to inject the voltage (from the 3v_LDO line in my case) and it works like a charm!!!!

    maybe ur problem is the same as mine, hope this help...

    Comment

    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3581
      • slovakia

      #3
      Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

      maybe, but why some time is ok 3.3V and after time get to 1.5V, but i try to hard wire from kbc to switch

      Comment

      • kodox
        Badcaps Veteran
        • Jul 2017
        • 322
        • Indonesia

        #4
        Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

        i think the signal line from KBC to power switch is ok, the problem is on 3v voltage on R198 to pull-up that pin high

        Comment

        • ktmmotocross
          Boardkiller
          • Feb 2014
          • 3581
          • slovakia

          #5
          Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

          i measure resistance across R198 and without battery it have correct 9.9kohm but when i connect battery resistance goes down to 3.1kohm.
          Last edited by ktmmotocross; 03-28-2020, 12:44 AM.

          Comment

          • ktmmotocross
            Boardkiller
            • Feb 2014
            • 3581
            • slovakia

            #6
            Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

            replaced KBC and now i have stable full 3,36V on NBSWON. I give it few days testing as i wrote that fault came after few days

            Comment

            • ktmmotocross
              Boardkiller
              • Feb 2014
              • 3581
              • slovakia

              #7
              Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

              this shit freaks me out.

              replaced kbc and still have leakage that pulls my 3.3V NBSWON down

              Comment

              • kodox
                Badcaps Veteran
                • Jul 2017
                • 322
                • Indonesia

                #8
                Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

                do u have 3VPCU on R198? if u don't try use a jumper wire to 3VPCU source

                Comment

                • ktmmotocross
                  Boardkiller
                  • Feb 2014
                  • 3581
                  • slovakia

                  #9
                  Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

                  yes i have. when laptop start it jumps to 3.3 but when is off after time somethig start to leak and it goes to 1.5V

                  Comment

                  • ktmmotocross
                    Boardkiller
                    • Feb 2014
                    • 3581
                    • slovakia

                    #10
                    Re: Lenovo thinkpad Edge 13 0217 - Spontaneously low NBSWON to 1.5V

                    changed pullup resistor 10k R198 to 2.2k and voltage goes up to 2.5V. still not perfect but now it dont make problems

                    Comment

                    Related Topics

                    Collapse

                    • Maxpower3
                      Brand name and Model Type for Lenovo error 2202 product name is invalid
                      by Maxpower3
                      Info for error 2202 LenovoThinkPad models and type

                      Extract from ThinkPad Maintenance Utilities Configuration File
                      plnsrv.ini Version 1.01


                      Some information that may be useful




                      There must also be missing models, add them to the list if you know of any.

                      Code:
                      brand name
                      20B1=ThinkPad Edge E445
                      20B2=ThinkPad Edge E545
                      20BC=ThinkPad Edge E145
                      20BM=ThinkPad X140e
                      20BL=ThinkPad X140e
                      20A3=ThinkPad X230s
                      20AH=ThinkPad X230s
                      20AK=ThinkPad X240s
                      20AJ=ThinkPad X240s
                      ...
                      02-21-2024, 10:27 AM
                    • Document Archive
                      Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook X Specification for Upgrade or Repair
                      by Document Archive
                      This specification for the Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the X1 Carbon + ThinkPad USB 3.0 Pro Dock boardview and X1 Carbon + ThinkPad USB 3.0 Pro Dock schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please...
                      09-06-2024, 11:40 AM
                    • Document Archive
                      Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook X Specification for Upgrade or Repair
                      by Document Archive
                      This specification for the Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the X1 Carbon + ThinkPad USB 3.0 Pro Dock boardview and X1 Carbon + ThinkPad USB 3.0 Pro Dock schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please...
                      09-06-2024, 11:40 AM
                    • Document Archive
                      Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook X Specification for Upgrade or Repair
                      by Document Archive
                      This specification for the Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the X1 Carbon + ThinkPad USB 3.0 Pro Dock boardview and X1 Carbon + ThinkPad USB 3.0 Pro Dock schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please...
                      09-06-2024, 11:40 AM
                    • Document Archive
                      Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook X Specification for Upgrade or Repair
                      by Document Archive
                      This specification for the Lenovo ThinkPad X1 Carbon + ThinkPad USB 3.0 Pro Dock Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the X1 Carbon + ThinkPad USB 3.0 Pro Dock boardview and X1 Carbon + ThinkPad USB 3.0 Pro Dock schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please...
                      09-06-2024, 11:40 AM
                    • Loading...
                    • No more items.
                    Working...