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    Dell inspiron 3521 la-9104p dead

    Model-Dell Inspiron 3521
    M/B-La-9104p rev 1.0(A00)
    Problem-Dead

    The ene kbc was shorted, so i replaced it with a new one and programmed it as well with Rt809F. unit still has no 3.3v

    I have tried the following:

    01. Replaced another new kbc and programmed-still same
    02. Replaced Pu200 with TPS 51125-still same
    03.Replaced Pu100(ISL88731)-still same.
    04. There is no short on 3v and 5v coils(PL200 & PL201)
    05.Tried flashing both Eprom's-still same.

    I have noticed one thing which has left me puzzled--If i connect pin16 of Kbd Connector(which is connected to pin 42 of KBC) to Ground-all voltaged appears on the board-3.3v at battery terminals and power switch. Mb wont turn on simply coz connecting pin 42 of kbc to Gnd means KBC is in programming mode.

    So whats wrong???
    Please advise friends as i have run out of ideas.

    #2
    Re: Dell inspiron 3521 la-9104p dead

    No ideas?? or i'm not clear in my explanation of case?

    Comment


      #3
      Re: Dell inspiron 3521 la-9104p dead

      Its so difficult to find out .............laptop repair is tough work, sometimes its bother me

      Comment


        #4
        Re: Dell inspiron 3521 la-9104p dead

        https://www.youtube.com/watch?v=rifMj6ne920

        Check this video you might find it useful and get some more clues...

        Comment


          #5
          Re: Dell inspiron 3521 la-9104p dead

          This is schematic and bios
          have you a short on 3.3v <-- EC ?

          ____________________

          MOD EDIT: Bios moved to bios requests sub forum
          .
          Attached Files
          Last edited by SMDFlea; 09-11-2022, 06:52 AM.

          Comment


            #6
            Re: Dell inspiron 3521 la-9104p dead

            I remember a similar issue on a thinkpad solved with a pch reflow but in this case you should , In this case you should try to separate 3.3V 5V block from its loads
            Attached Files
            Last edited by jasko_jacker; 08-12-2017, 11:00 AM.

            Comment


              #7
              Re: Dell inspiron 3521 la-9104p dead

              Check at PL600 & PL601 for short circuit. And also PU600.

              Comment


                #8
                Re: Dell inspiron 3521 la-9104p dead

                Originally posted by jasko_jacker View Post
                This is schematic and bios dump,
                have you a short on 3.3v <-- EC ?
                No short on 3.3v ec

                Comment


                  #9
                  Re: Dell inspiron 3521 la-9104p dead

                  Originally posted by raajkumar View Post
                  Check at PL600 & PL601 for short circuit. And also PU600.
                  Both the coils are not shorted to Gnd. Checked with a working board. Pu600 is fine

                  Comment


                    #10
                    Re: Dell inspiron 3521 la-9104p dead

                    i had the same issue on a motherboard. but i don't remember which resistor is damaged. so check resistors around pu200.
                    Last edited by raajkumar; 08-14-2017, 01:20 AM.

                    Comment


                      #11
                      Re: Dell inspiron 3521 la-9104p dead

                      check RE4 and RE1
                      Last edited by smali; 08-14-2017, 06:08 AM.

                      Comment


                        #12
                        thanks

                        Comment


                          #13
                          Re: Dell inspiron 3521 la-9104p dead

                          dears i have a problem dell 15-3521la-9104p)
                          it showing the massage battery not identifed system unable to charge
                          i change battery ,charger
                          chargig ic
                          3,5 ic
                          all starting /charging mosfets
                          near charging ic components
                          pch bios 32/io,bios16 bios programmed
                          io chip kb012qf changed and programmed
                          but no chance please help me friends

                          Comment


                            #14
                            Re: Dell inspiron 3521 la-9104p dead

                            Can u run the laptop only on charged battery?? Check for shorted caps on battery output lines. What about PS_ID??

                            Comment


                              #15
                              Re: Dell inspiron 3521 la-9104p dead

                              thanks

                              Comment


                                #16
                                Re: Dell inspiron 3521 la-9104p dead

                                Originally posted by jijunmedia View Post
                                dears i have a problem dell 15-3521la-9104p)
                                it showing the massage battery not identifed system unable to charge
                                i change battery ,charger
                                chargig ic
                                3,5 ic
                                all starting /charging mosfets
                                near charging ic components
                                pch bios 32/io,bios16 bios programmed
                                io chip kb012qf changed and programmed
                                but no chance please help me friends
                                This sort of "hit and trial" approach makes things worse and sometimes render the mb unrepairable. Identify the fault first, understand the circuit or seek help in the forum instead of killing mb's.

                                Comment


                                  #17
                                  Re: Dell inspiron 3521 la-9104p dead

                                  thanks

                                  Comment


                                    #18
                                    Re: Dell inspiron 3521 la-9104p dead

                                    Thank you

                                    Comment


                                      #19
                                      Re: Dell inspiron 3521 la-9104p dead

                                      Thank you

                                      Comment


                                        #20
                                        Re: Dell inspiron 3521 la-9104p dead

                                        Thanks a lot guys.

                                        Comment

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