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Dell Inspiron 3521 [La-9104p] no power

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    #21
    Re: Dell Inspiron 3521 [La-9104p] no power

    Originally posted by classicandy View Post
    By VCC, did you mean VDDP_LDO? because, that's the only pin with 5v on PU100.

    Or probably, external 5v would more preferable.
    I'm talking about +5VALW pin 11 of PU100. It comes from PU200 (+5VALWP --> PJP202 --> +5VALW).
    Attached Files
    Last edited by Ikung; 04-16-2020, 06:47 AM. Reason: Wrong .png

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      #22
      Re: Dell Inspiron 3521 [La-9104p] no power

      Originally posted by Ikung View Post
      I'm talking about +5VALW pin 11 of PU100. It comes from PU200 (+5VALWP --> PJP202 --> +5VALW).
      Ok, I know of Pin 11 with +5VALW. I meant which other Pin you wanted me to connect Pin 11 to. Of which Pin 21 (VDD_LDO) gives out +5V also.

      By the way, I have changed my Multimeter probes and measured Pin 13 of PU200 and now I'm getting 0.13v on both boards. The charging led goes off when I touch Pin 13 with my RED probe (for the other unit that Powers On).
      Am I doing it correctly?
      What is supposed to be the correct voltage on Pin 13?

      Also, I'm using a 90W charger. I have 3 units of this particular Dell motherboard and the charger works well with the other two that Powers On and charge battery.......

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        #23
        Re: Dell Inspiron 3521 [La-9104p] no power

        Any help on this? I'm still stuck on this motherboard issue. Thanks......

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          #24
          Re: Dell Inspiron 3521 [La-9104p] no power

          I THINK YOU MISS SOMETHING HERE AT
          UE1
          Pin 115, LID_SW# = 0 VOLT
          IT SHOULD BE 3.3 VOLT ON IT

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            #25
            Re: Dell Inspiron 3521 [La-9104p] no power

            Originally posted by qayyum786 View Post
            I THINK YOU MISS SOMETHING HERE AT
            UE1
            Pin 115, LID_SW# = 0 VOLT
            IT SHOULD BE 3.3 VOLT ON IT
            Thanks. No 3.3VALW present to power LID_SW#

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              #26
              Re: Dell Inspiron 3521 [La-9104p] no power

              That board was still with you

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                #27
                Re: Dell Inspiron 3521 [La-9104p] no power

                Originally posted by classicandy View Post
                Thanks. No 3.3VALW present to power LID_SW#
                Then why not check LID Switch ??

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                  #28
                  Re: Dell Inspiron 3521 [La-9104p] no power

                  Originally posted by qayyum786 View Post
                  That board was still with you
                  yes. I own it.

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                    #29
                    Re: Dell Inspiron 3521 [La-9104p] no power

                    Is it ok now ?

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                      #30
                      Re: Dell Inspiron 3521 [La-9104p] no power

                      Originally posted by mcplslg123 View Post
                      Then why not check LID Switch ??
                      LID Switch is on a separate board (power button board) which is not connected.

                      I have two other motherboards of this model which have 3.3V on LID_SW# when the power button board is not connected too. 3.3V present at Pin 115 of UE1 on both motherboards

                      Where else can I check?

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                        #31
                        Re: Dell Inspiron 3521 [La-9104p] no power

                        Originally posted by qayyum786 View Post
                        Is it ok now ?
                        No, I just kept it so I could focus on other ones

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                          #32
                          Re: Dell Inspiron 3521 [La-9104p] no power

                          Great
                          Cheack PU100 pin 7 impedance

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                            #33
                            Re: Dell Inspiron 3521 [La-9104p] no power

                            PU100 pin 7 Is it short to ground or good impedance ?
                            Charge Enable (pin 7) should be 3 volt
                            Last edited by qayyum786; 06-15-2020, 09:43 AM.

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                              #34
                              Re: Dell Inspiron 3521 [La-9104p] no power

                              Originally posted by classicandy View Post
                              Hello, Please I have this Dell Inspiron 3521 [La-9104p] that is dead. There is no visible damaged component. It just tripped off while booting one certain day and has not powered on since then. Doesn't charge either.

                              I have replaced PU200 [3.3V/5V IC]

                              Currently, when I connect the charger;

                              B++ is present

                              3.3VALWP/5VALWP not present
                              VREG3 and VREG5 is present
                              PGOOD is not present

                              RTC is ok.

                              Where else do I need to check to determine the fault?
                              check pq200 3v5v ic pin numper 09 boot2 and pin number 22 boot1 ,,both pin near once 2R2 resisitor ,90% precent sure it is gone,,check multimeter beep mode or resistence value,,,i fix it same your problme,,common fualt this compal board,,pin 09 boot2 near resistor check,,

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