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Samsung XE700T1C charging circuit

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    #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
    #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

      #3
      Re: Samsung XE700T1C charging circuit

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

      Comment

        #4
        Re: Samsung XE700T1C charging circuit

        Originally posted by spidey View Post
        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

          #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

            #6
            Re: Samsung XE700T1C charging circuit

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

            Comment

              #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

                #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

                  #9
                  Re: Samsung XE700T1C charging circuit

                  Did you solve the problem?
                  Thanks

                  Comment

                    #10
                    Re: Samsung XE700T1C charging circuit

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

                    Comment

                      #11
                      Re: Samsung XE700T1C charging circuit

                      Originally posted by ploty View Post
                      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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