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Latitude 6430u shorts ac adapter/ need schematics LA-8831P

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    Latitude 6430u shorts ac adapter/ need schematics LA-8831P

    Hello,

    Need your help, I have Dell Latitude 6430u which shorts ac adapter.
    First of all as you could had understand from title, I will be very glad if someone could share schematic of this motherboard: LA-8831P
    Original Dell parts for sale

    #2
    Re: Latitude 6430u shorts ac adapter/ need schematics

    Schematics attached.
    Is the short on B+?
    Attached Files
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: Latitude 6430u shorts ac adapter/ need schematics

      Hi there,
      Look for shorted FET usually SOIC8 package.
      After you find the short FET take him out from the P.C.B
      And check each pad on the PCB with reference to ground
      For short circuit.
      You probably have also a SMD ceramic CAP shorted to ground.
      Hope you will find it.
      Good luck

      Comment


        #4
        Re: Latitude 6430u shorts ac adapter/ need schematics

        Originally posted by piernov View Post
        Schematics attached.
        Is the short on B+?
        Wrong schematic, its LA-8331p - Acer motherboard, And I asked for LA-8831P - Dell motherboard.
        But nevermind, found bad SMD ceramic CAP shorted to ground, and that was all.
        Original Dell parts for sale

        Comment


          #5
          Re: Latitude 6430u shorts ac adapter/ need schematics

          Yeah sorry, overlooked that one. No schematics for this one. (Why did Compal use the same product code for AMD and Intel platform anyway?)
          I guess you could use the Latitude 6430, LA-7731p schematics.
          Anyway glad to hear you fixed it.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment


            #6
            Re: Latitude 6430u shorts ac adapter/ need schematics

            Hello,

            I had the same issue with a Dell 6430U after connected to the USB port a wifi router.
            When plug the pwoer supply cable to he laptop , the LED on the cable PSU switch off for protection.
            Replaced the Mosfet but nothing changed, could you please give me an idea where was located SMD ceramic CAP shorted to ground?

            Thanks

            Comment


              #7
              Re: Latitude 6430u shorts ac adapter/ need schematics

              if you have regulated power supply inject power to the shorted power line but as low as possible,maybe around 1V-better if you see wattage on your supply-something around 1-2W and try with hand which component is heating.but it is dangerous for other components,try it only if you realy undestand what i say and mean :-)

              Comment


                #8
                Re: Latitude 6430u shorts ac adapter/ need schematics

                Originally posted by lvalius View Post
                Wrong schematic, its LA-8331p - Acer motherboard, And I asked for LA-8831P - Dell motherboard.
                But nevermind, found bad SMD ceramic CAP shorted to ground, and that was all.
                i have the same problem, i would really appreciate if you could give some advice about where to find the shorted cap you found

                Comment


                  #9
                  Re: Latitude 6430u shorts ac adapter/ need schematics

                  Originally posted by yesuha View Post
                  i have the same problem, i would really appreciate if you could give some advice about where to find the shorted cap you found
                  i have found the shorted cap, the injecting voltage and watch what gets hot didn´t work this time, if someone have the same problem please upload a motherboard picture and i will mark where the cap it's located, i just gave the laptop to my cousin

                  Comment


                    #10
                    Dell 6430u i7 qcz00 LA-8831p

                    Hi has anyone got a board diagram i have couple of burnt-out components it creating a short as soon as you plug charger in . Charger goes off . Looks like it capacitors
                    Dell 6430u i7. qcz00 LA-8831p
                    Many thanks regards james
                    Laptop Laptop https://imgur.com/gallery/1g94TFv

                    https://imgur.com/gallery/ZpW2wDN

                    https://ibb.co/8XzC1Tb

                    https://ibb.co/QK2SnRy
                    Last edited by Diesalweasel; 01-09-2021, 06:37 PM.

                    Comment


                      #11
                      Re: Latitude 6430u shorts ac adapter/ need schematics

                      I need schematics and board view for dell 6430U La 8831p, someone please thank you.
                      Its there on paid sites please

                      Comment


                        #12
                        Re: Latitude 6430u shorts ac adapter/ need schematics

                        Originally posted by chaz brandon View Post
                        I need schematics and board view for dell 6430U La 8831p, someone please thank you.
                        Its there on paid sites please
                        Can you find it on any paid sites
                        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                        Comment


                          #13
                          Re: Latitude 6430u shorts ac adapter/ need schematics LA-8831P

                          Schematic
                          Attached Files
                          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                          Comment


                            #14
                            Re: Latitude 6430u shorts ac adapter/ need schematics LA-8831P

                            Hello to all,
                            Hope it will help you all.
                            Nataf10
                            Last edited by nataf10; 08-03-2021, 09:09 AM.

                            Comment


                              #15
                              Re: Latitude 6430u shorts ac adapter/ need schematics LA-8831P

                              Merci. Thanks
                              Last edited by SMDFlea; 04-05-2022, 06:12 PM.

                              Comment


                                #16
                                Re: Latitude 6430u shorts ac adapter/ need schematics LA-8831P

                                one caps shorted near of PQ1305, changed, laptop is ok
                                two big caps, up one was shorted
                                Attached Files

                                Comment


                                  #17
                                  Re: Latitude 6430u shorts ac adapter/ need schematics LA-8831P

                                  Thanks for schematic.
                                  Have same problem (short circuit in B+). But not near PQ3105.
                                  After some tests (give power in B+) had find warm place near PQ706 and PQ704. One of capacitors was in SC. it was 10u 25V 0805 smd capacitor

                                  Comment

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