Samsung XE700T1C charging circuit

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  • Proxyep
    Member
    • Nov 2010
    • 14
    #1

    Samsung XE700T1C charging circuit

    not sure how familliar anyone would be with this but long story short, a reversed polarity charger was connected to this and now it won't charge. I can't find any circuit diagrams of this (I looked through the service manual and found nothing)

    but I think I have found the charging circuit ( the -dc in leads to one of the pins of the TI chip), I'm pretty sure there is a diode or fuse blown somewhere that can be replaced, the battery itself isn't getting any of the charging current (12v in, the battery which is currently at 7.5v stays at 7.5 v when the charger is plugged in)

    I have attached the Samsung ATIV pro XE700T1C service schematics for anyone else out there who might ever need it

    http://imgur.com/a/MbAlL picture gallery

    The chip says
    2421-2
    TI 26A
    P2 JH64

    or
    2421-2
    TI 2BA
    P2 JH64

    im guessing its a TI SOIC? anyone else have any better experience with this or can anyone else offer advice? I can't seem to find anything about this chip

    edit: did some more tests, pretty sure this is the chip, found this:http://www.ti.com/product/tps2421-2?CMP=AFC-conv_SF_SEP

    advice on what to dO? Schottky diode replace?
    Last edited by Proxyep; 11-11-2013, 04:24 AM.
    Tags: None
    • rievax_60
      Badcaps Veteran
      • May 2012
      • 897
      • australia
      #2
      Re: Samsung XE700T1C charging circuit

      I repaired a Samsung netbook lately, cant remember the model or much else.
      The owner had applied reverse polarity somehow from a charger.
      I traced the 19v path in to the Drain of a MOSFET, then from its Source to the Source of another MOSFET, both N-ch.
      One of the MOSFETs was Gate to Source short.

      Will you update your profile?

        Comment

        • spidey
          climbs
          • Dec 2012
          • 644
          • Cyprus
          #3
          Re: Samsung XE700T1C charging circuit

          need to tell us the mobo code to find the schematic.

            Comment

            • Proxyep
              Member
              • Nov 2010
              • 14
              #4
              Re: Samsung XE700T1C charging circuit

              Originally posted by spidey
              need to tell us the mobo code to find the schematic.
              not really sure where to find it and I don't think you might know either
              Would it be helpful if I took pictures of the entire motherboard?

              Looking through the spare parts available which seems to be quite substantial, I noticed APL5155 a low ground current linear regulator, i wonder why that is a available...
              Last edited by Proxyep; 11-11-2013, 08:07 PM.

                Comment

                • Proxyep
                  Member
                  • Nov 2010
                  • 14
                  #5
                  Re: Samsung XE700T1C charging circuit

                  I think the mobo code is:
                  BA92-11606A

                  any assistance or tips on how I might deal with this without schematics?

                    Comment

                    • spidey
                      climbs
                      • Dec 2012
                      • 644
                      • Cyprus
                      #6
                      Re: Samsung XE700T1C charging circuit

                      samsung motherboards uses city names in most of all. it should be like "istanbul", "berlin" "bonn" etc..

                        Comment

                        • Proxyep
                          Member
                          • Nov 2010
                          • 14
                          #7
                          Re: Samsung XE700T1C charging circuit

                          Any idea how I can find that out? Thing is I'm not sure of this qualifies for a laptop cause it's a tablet pc

                          Apparently the codename is Jones?

                            Comment

                            • Sendis
                              New Member
                              • Feb 2015
                              • 1
                              • Czech republic
                              #8
                              Re: Samsung XE700T1C charging circuit

                              Hi there, I've got exactly the same problem. After a long search online, i found this thread, could you please let me know if you managed to fix the problem? Thanks you, Sendis

                                Comment

                                • Javovania
                                  New Member
                                  • Jun 2015
                                  • 1
                                  • Guatemala
                                  #9
                                  Re: Samsung XE700T1C charging circuit

                                  Did you solve the problem?
                                  Thanks

                                    Comment

                                    • ploty
                                      Member
                                      • Apr 2013
                                      • 12
                                      • portugal
                                      #10
                                      Re: Samsung XE700T1C charging circuit

                                      Same problem. Polarity inverted in charged. Is tps 2421-2 problem? Can someone help?

                                        Comment

                                        • ploty
                                          Member
                                          • Apr 2013
                                          • 12
                                          • portugal
                                          #11
                                          Re: Samsung XE700T1C charging circuit

                                          Originally posted by ploty
                                          Same problem. Polarity inverted in charged. Is tps 2421-2 problem? Can someone help?
                                          ok. i found solution.
                                          mosfet q38 shorted.
                                          is a aon7200. you can replace by 9402gyt. now is power on without battery and with battery inside.
                                          in my case, bq735 was not afected

                                            Comment

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