3521 not working

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  • asem18
    Senior Member
    • Oct 2016
    • 112
    • my workshop
    #1

    3521 not working

    Hello everyone ....i have dell inspiron 3521 not working, motherboard 9104p , 19v is ok ,no 3valw/5valw , no short to ground in the rail of 19v and the rail of 3/5 valw...
    entrip 1 and 2 = 1.2 and 1.3 v
    vreg 3 = 3.3v and vreg 5 = 5 v! pin 13 en = 2v PS_ID pin 16 of UE1 SIO = 0.2mv sometimes when i plug the ac adapataer or power supply i got 3/5 valwys ,but just swish on a little light on led than nothing and 3/5v alwys dissappear what shoul i check else..thank you
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: 3521 not working

      Schematic is there. Probe the ps_id circuit as its not working. Without correct ps_id it's not going to work.Check PD901/902,PQ901, PR903. Btw, Is the adapter dell original and known good??

        Comment

        • caspian
          Badcaps Legend
          • Oct 2015
          • 1589
          • Laptop
          #3
          Re: 3521 not working

          I guess the SIO or some IC connected to SIO got defective. Now you should check resistance on all ICs which are connected to SIO to find a shorted one.

            Comment

            • asem18
              Senior Member
              • Oct 2016
              • 112
              • my workshop
              #4
              Re: 3521 not working

              Originally posted by mcplslg123
              Schematic is there. Probe the ps_id circuit as its not working. Without correct ps_id it's not going to work.Check PD901/902,PQ901, PR903. Btw, Is the adapter dell original and known good??
              yes original adapter ...tested for confirmation with another same mobo and it works
              PD 902 don't exsist
              PD901,PQ901, PR903 = 0.2mv
              Last edited by asem18; 08-31-2019, 07:24 AM.

                Comment

                • asem18
                  Senior Member
                  • Oct 2016
                  • 112
                  • my workshop
                  #5
                  Re: 3521 not working

                  Originally posted by caspian
                  I guess the SIO or some IC connected to SIO got defective. Now you should check resistance on all ICs which are connected to SIO to find a shorted one.
                  No EC_VDD/VCC and no EC_VDD/AVCC
                  diode mode : coils 3/5v alwys = 0.190v ( ok)
                  coil +1.5VP = 0.148 v (ok)
                  rail 19v = 0.631v (ok)
                  rail psid on coil pl902 = 0.998v

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india
                      #6
                      Re: 3521 not working

                      Originally posted by asem18
                      yes original adapter ...tested for confirmation with another same mobo and it works
                      PD 902 don't exsist
                      PD901,PQ901, PR903 = 0.2mv
                      PD901/PQ901 have 3 pins. You need to post voltage on all pins. Pr903 is 33 Ohms?? Voltage on both sides of PR903?

                        Comment

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