Dell 3521 unusually short to ground

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  • samanthban
    Badcaps Veteran
    • Feb 2014
    • 253
    • Sri lanka
    #1

    Dell 3521 unusually short to ground

    This is a common fault in this laptop due to i got 3 laps with same issue . once dc jack connect laptop gets power. 3v and 5v are ok. once i press the power button power light on and stay as same .nothing happen

    when i check 3v and 5v rail short to ground but it will disapir after 5 minits or when i connect some caps to ground in the same rail

    even its short i can connect my dc power supply no short to be shown even i can press the power button that time also power light stay on

    then i noticed some voltage is remaining in that rail and reducing little by little same like discharging fault

    flowing things done but still the same manner

    flash bios ec main
    changed io and reprogrammed
    changed 3v 5v regulator
    changed pch as well

    but no changed at all

    please help me to sort it out this matter
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    • meritosari
      Senior Member
      • Oct 2010
      • 774
      • Indonesia
      #2
      Re: Dell 3521 unusually short to ground

      could be bad mosfets and solid caps on 3v/5v regulator. the symptom appear if the board have age more than 3 years. this case due your DMM using battery 9v. if you measure resistance on some rails (i.e 19v vs gnd) look like you've charge the caps, but I'm not pretty sure, but you can try it than doing hard work on PCH

        Comment

        • samanthban
          Badcaps Veteran
          • Feb 2014
          • 253
          • Sri lanka
          #3
          Re: Dell 3521 unusually short to ground

          Originally posted by meritosari
          could be bad mosfets and solid caps on 3v/5v regulator. the symptom appear if the board have age more than 3 years. this case due your DMM using battery 9v. if you measure resistance on some rails (i.e 19v vs gnd) look like you've charge the caps, but I'm not pretty sure, but you can try it than doing hard work on PCH

          Thanks for your reply ..I will check those as you said and reply back.
          sigpic

            Comment

            • samanthban
              Badcaps Veteran
              • Feb 2014
              • 253
              • Sri lanka
              #4
              Re: Dell 3521 unusually short to ground

              Originally posted by meritosari
              could be bad mosfets and solid caps on 3v/5v regulator. the symptom appear if the board have age more than 3 years. this case due your DMM using battery 9v. if you measure resistance on some rails (i.e 19v vs gnd) look like you've charge the caps, but I'm not pretty sure, but you can try it than doing hard work on PCH
              Changed pc213,pc212.pq202,203,204,205 no luck
              sigpic

                Comment

                • samanthban
                  Badcaps Veteran
                  • Feb 2014
                  • 253
                  • Sri lanka
                  #5
                  Re: Dell 3521 unusually short to ground

                  rsmrst releasing from io
                  sigpic

                    Comment

                    • raajkumar
                      Badcaps Veteran
                      • Mar 2015
                      • 354
                      • Srilanka
                      #6
                      Re: Dell 3521 unusually short to ground

                      Did you checked display cable.

                        Comment

                        • smali
                          Badcaps Veteran
                          • Sep 2014
                          • 287
                          • Pakistan
                          #7
                          Re: Dell 3521 unusually short to ground

                          what about the other voltage when you press power button like RAM,CPU core .

                            Comment

                            • smali
                              Badcaps Veteran
                              • Sep 2014
                              • 287
                              • Pakistan
                              #8
                              Re: Dell 3521 unusually short to ground

                              check your ENTRIP1 and ENTRIP2 section.

                                Comment

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