Dell m5110 power issue

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  • bluestone
    Badcaps Veteran
    • Jun 2011
    • 343
    • Ghana
    #1

    Dell m5110 power issue

    I have done a lot of troubleshooting on this particular board but it is always getting me confused so I need help. The problem is that no power at all immediately you plug in the charger TPS51123 start to get hot. I have replaced it with a new one still same.
    this is some readings I did on the Tps51123 when charger is plugged in
    pin16 = vin=19.1v
    Pin8 = vreg3=0.983v
    pin17=vreg5=5.1v
    These pins also short to ground immediately charger is plugged in pin7=v02, pin24=v01, pin12=drvl2, and pin21=drvl1.
    I need help
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    • samanthban
      Badcaps Veteran
      • Feb 2014
      • 253
      • Sri lanka
      #2
      Re: Dell m5110 power issue

      I failed too, with this situation in dell 3521 .once charger is plugged in power button short to ground after some time that will disappear~
      sigpic

        Comment

        • bluestone
          Badcaps Veteran
          • Jun 2011
          • 343
          • Ghana
          #3
          Re: Dell m5110 power issue

          I think there should be a way out

            Comment

            • lukkil
              New Member
              • Aug 2018
              • 1
              • Polska
              #4
              Re: Dell m5110 power issue

              did u solve the problem?
              cheers

                Comment

                • ktmmotocross
                  Boardkiller
                  • Feb 2014
                  • 3578
                  • slovakia
                  #5
                  Re: Dell m5110 power issue

                  find why is Vreg3 pulled low. maybe kbc is bad but u must find what pulling down 3D3V_AUX_S5. i see there are many things that could do it, like Q2703, Q2701 ...

                  go one after another. if u cannot measure bad thing just go one by one and remove ics that could do that

                  also that shorts on 3v and 5v sides must be rid off. check all 4 mosfets
                  Last edited by ktmmotocross; 02-01-2019, 01:46 PM.

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