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    Toshiba A-300 notebook does nothing

    hello companions this portable A-300 has arrived without ignition, when I open it I find that q801 that in its pins 1,2 and 3 measure me 20v and in pin 4 its gate also measures me 20v which I think it should not be and in pins 5,6,7 and 8 0v so there is no voltage over there. I changed the mosfet in case it was malfunctioning but still the same
    Looking over I see nothing burned, I doubt the IC U803; I have measured pin 12 VDC and the 20v enter, pin 3 and 4 and pin 24 00.6.
    I think it's not working well.
    I pass the scheme of the plate that is pt10g 6050a2171501 mb a03
    Attached Files

    #2
    Re: Toshiba A-300 notebook does nothing

    Resistance to ground on +VBAT?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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      #3
      Re: Toshiba A-300 notebook does nothing

      The 1st Fet P channel Gate should be less than 10V Check the voltage on ACDRV pin 2 U803

      Comment


        #4
        Re: Toshiba A-300 notebook does nothing

        la resistencia en escala de 200 ohm es de 68,4

        The resistance in 200 ohm scale is 68.4
        Last edited by SMDFlea; 01-19-2020, 01:07 PM. Reason: google translate

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          #5
          Re: Toshiba A-300 notebook does nothing

          el pin ACDRV 2 U803 da 20v lo mismo que en pin4 deQ801 al estar comunicado.
          en fuente allways no tengo ni 3v ni5v ya que no pasa el voltaje del principio y no tengo voltaje en el resto de la placa.

          the ACDRV 2 U803 pin gives 20v the same as in pin4 of Q801 when communicating.
          In source allways I have neither 3v nor 5v since the voltage of the beginning does not pass and I have no voltage in the rest of the board.
          Last edited by SMDFlea; 01-19-2020, 01:08 PM. Reason: google translate

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            #6
            Re: Toshiba A-300 notebook does nothing

            Originally posted by diegito11 View Post
            el pin ACDRV 2 U803 da 20v lo mismo que en pin4 deQ801 al estar comunicado.
            en fuente allways no tengo ni 3v ni5v ya que no pasa el voltaje del principio y no tengo voltaje en el resto de la placa.
            English pl

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              #7
              Re: Toshiba A-300 notebook does nothing

              Sorry I didn't realize.
              the ACDRV 2 U803 pin gives 20v the same as in pin4 of Q801 when communicating.
              In source allways I have neither 3v nor 5v since the voltage of the beginning does not pass and I have no voltage in the rest of the board.

              Comment


                #8
                Re: Toshiba A-300 notebook does nothing

                Originally posted by diegito11 View Post
                la resistencia en escala de 200 ohm es de 68,4

                The resistance in 200 ohm scale is 68.4
                is this +VBAT resistance?? If so your +19V rail is shorted.

                Comment


                  #9
                  Re: Toshiba A-300 notebook does nothing

                  then I rule out U803 that is wrong?

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                    #10
                    Re: Toshiba A-300 notebook does nothing

                    Well I checked by removing Q801 and I connected it by measuring pin4 the gate and it still gives me 19v so U803 ic BQ24721C is wrong.
                    I wanted to ask you here I have several ic that I do not know if they will be compatible with this, I pass the list and tell me:
                    TPS51125RG
                    MAX17435
                    Bq24703 the latter I think if not?

                    Comment


                      #11
                      Re: Toshiba A-300 notebook does nothing

                      Originally posted by diegito11 View Post
                      Well I checked by removing Q801 and I connected it by measuring pin4 the gate and it still gives me 19v so U803 ic BQ24721C is wrong.
                      I wanted to ask you here I have several ic that I do not know if they will be compatible with this, I pass the list and tell me:
                      TPS51125RG
                      MAX17435
                      Bq24703 the latter I think if not?

                      https://bdfixforum.blogspot.com/2016...uivalents.html

                      Comment


                        #12
                        Re: Toshiba A-300 notebook does nothing

                        please dont judge anything when u cannot understand function of BQ

                        read datasheet of it

                        what is ACDET, VCC, ACDRV#, VREF5, CHGEN# voltages?

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                          #13
                          Re: Toshiba A-300 notebook does nothing

                          Originally posted by ktmmotocross View Post
                          please dont judge anything when u cannot understand function of BQ

                          read datasheet of it

                          what is ACDET, VCC, ACDRV#, VREF5, CHGEN# voltages?
                          I said that because a tv electronica told him about it and he told me that, I don't know if it is not the same case in tv electronics.
                          I pass the measures:
                          pin 5 ACDET 00,9v
                          pin12 VDC 20v
                          pin 2 ACDRV # 20v
                          pin11 VREFS 0v
                          pin 1 CHGEN # 00,1v

                          Comment


                            #14
                            Re: Toshiba A-300 notebook does nothing

                            as first u see in datasheet
                            https://cdn.badcaps-static.com/pdfs/...0f5cb1cd24.pdf

                            , u dont have ACDET signal, which detects power adapter

                            next u dont have VREF5

                            Comment


                              #15
                              Re: Toshiba A-300 notebook does nothing

                              Originally posted by ktmmotocross View Post
                              as first u see in datasheet
                              https://cdn.badcaps-static.com/pdfs/...0f5cb1cd24.pdf

                              , u dont have ACDET signal, which detects power adapter

                              next u dont have VREF5
                              What does that mean, that U803 is wrong?
                              Last edited by diegito11; 01-25-2020, 01:55 PM.

                              Comment


                                #16
                                Re: Toshiba A-300 notebook does nothing

                                measure ACDET circuit. R814 awith R815 works as voltage divider

                                u have whole schematic and datasheet. try to figure it out

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