IBM R50e schematics

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  • rtstorm
    Badcaps Veteran
    • Feb 2012
    • 971
    • Croatia

    #1

    IBM R50e schematics

    Hello, please i need schematics for this laptop it wont start.

    Thank you
    ...the quieter you become the more you are able to hear...
  • atsio
    Badcaps Veteran
    • Oct 2013
    • 819
    • Greece

    #2
    Re: IBM R50e schematics

    https://www.youtube.com/watch?v=NRmkjYiYGhE
    Attached Files

    Comment

    • rtstorm
      Badcaps Veteran
      • Feb 2012
      • 971
      • Croatia

      #3
      Re: IBM R50e schematics

      thanks, i found that on page 67 i have only input V+ 16V (this laptop has 16V adapter) but no output on that MAX1631 IC. I have some small voltages coming of but nothing above 1V
      ...the quieter you become the more you are able to hear...

      Comment

      • atsio
        Badcaps Veteran
        • Oct 2013
        • 819
        • Greece

        #4
        Re: IBM R50e schematics

        Originally posted by rtstorm
        thanks, i found that on page 67 i have only input V+ 16V (this laptop has 16V adapter) but no output on that MAX1631 IC. I have some small voltages coming of but nothing above 1V
        What are the voltages on pins 9,21,23 of U41?
        What are the voltages on pins 52, 57, 59 of U61?

        Comment

        • rtstorm
          Badcaps Veteran
          • Feb 2012
          • 971
          • Croatia

          #5
          Re: IBM R50e schematics

          On U41 pin 9 is 0V, pin 21 and 23 are oscilating from 0V to 0.2V
          On U61 pin 52 is 0V, pin 57 is 15,9V and pin59 is 0V
          ...the quieter you become the more you are able to hear...

          Comment

          • atsio
            Badcaps Veteran
            • Oct 2013
            • 819
            • Greece

            #6
            Re: IBM R50e schematics

            Which IC is U61?

            Comment

            • rtstorm
              Badcaps Veteran
              • Feb 2012
              • 971
              • Croatia

              #7
              Re: IBM R50e schematics

              it is toshiba tb62501f
              ...the quieter you become the more you are able to hear...

              Comment

              • atsio
                Badcaps Veteran
                • Oct 2013
                • 819
                • Greece

                #8
                Re: IBM R50e schematics

                I think your problem is the Toshiba but better check it first.
                Check on U61 voltages on pins 1, 2, 55, 52, 54, 44, 58.

                Comment

                • rtstorm
                  Badcaps Veteran
                  • Feb 2012
                  • 971
                  • Croatia

                  #9
                  Re: IBM R50e schematics

                  pin 1 - 0V
                  pin 2 - 0.3V
                  pin 55 - 0V
                  pin 52 - 0V
                  pin 54 - 5.6V
                  pin 44 - 0V
                  pin 58 - 0V
                  ...the quieter you become the more you are able to hear...

                  Comment

                  • atsio
                    Badcaps Veteran
                    • Oct 2013
                    • 819
                    • Greece

                    #10
                    Re: IBM R50e schematics

                    Give voltages on all pins of U42.

                    Comment

                    • rtstorm
                      Badcaps Veteran
                      • Feb 2012
                      • 971
                      • Croatia

                      #11
                      Re: IBM R50e schematics

                      U42:
                      pin 1 - 15.93V
                      pin 2 - 16.38V
                      pin 3 - 16.38V
                      pin 4 - 0V
                      pin 5 - 0V
                      pin 6 - 0V
                      pin 7 - 0V
                      pin 8 - 0V
                      pin 9 - 0V
                      pin10 - 0V
                      pin11 - 0V
                      pin12 - 3V
                      pin13 - 0V
                      pin14 - 0.2V
                      pin15 - 0V
                      pin16 - 0V
                      pin17 - 0.2V
                      pin18 - 0.2V
                      pin19 - 0V
                      pin20 - 0V
                      pin21 - 0V
                      pin22 - 0.3V
                      pin23 - 0.2V
                      pin24 - 0.2V
                      Last edited by rtstorm; 03-31-2014, 12:38 PM.
                      ...the quieter you become the more you are able to hear...

                      Comment

                      • atsio
                        Badcaps Veteran
                        • Oct 2013
                        • 819
                        • Greece

                        #12
                        Re: IBM R50e schematics

                        I think your charger is dead and you must change it.

                        Comment

                        • rtstorm
                          Badcaps Veteran
                          • Feb 2012
                          • 971
                          • Croatia

                          #13
                          Re: IBM R50e schematics

                          you mean this U42 (High Frequency Switch Mode Li-Ion Battery Charger)
                          ...the quieter you become the more you are able to hear...

                          Comment

                          • atsio
                            Badcaps Veteran
                            • Oct 2013
                            • 819
                            • Greece

                            #14
                            Re: IBM R50e schematics

                            Yes. It sends signal to enable U61 which sends signal to enable MAX.

                            Comment

                            • rtstorm
                              Badcaps Veteran
                              • Feb 2012
                              • 971
                              • Croatia

                              #15
                              Re: IBM R50e schematics

                              hi, i replaced the U42 but laptop still wont start

                              i check U41 and U61 all voltages are still the same. I test this widouth pushing start button is this ok?
                              Last edited by rtstorm; 04-24-2014, 05:44 PM.
                              ...the quieter you become the more you are able to hear...

                              Comment

                              • atsio
                                Badcaps Veteran
                                • Oct 2013
                                • 819
                                • Greece

                                #16
                                Re: IBM R50e schematics

                                What are the voltages on U42?

                                Comment

                                • rtstorm
                                  Badcaps Veteran
                                  • Feb 2012
                                  • 971
                                  • Croatia

                                  #17
                                  Re: IBM R50e schematics

                                  U42:
                                  pin 1 - 16V
                                  pin 2 - 16V
                                  pin 3 - 16V
                                  pin 4 - 0V
                                  pin 5 - 0V
                                  pin 6 - 0V
                                  pin 7 - 0V
                                  pin 8 - 0V
                                  pin 9 - 0V
                                  pin10 - 0V
                                  pin11 - 0V
                                  pin12 - 0V
                                  pin13 - 0V
                                  pin14 - 0V
                                  pin15 - 0V
                                  pin16 - 0V
                                  pin17 - 0V
                                  pin18 - 0V
                                  pin19 - 0V
                                  pin20 - 0V
                                  pin21 - 0V
                                  pin22 - 0V
                                  pin23 - 0V
                                  pin24 - 0V

                                  i this this is bad IC too, whyt did you think i have input (VCC, SYS+ and SYS-)

                                  Maybe i have some solder bridge between pins, i this i should have some output from IC
                                  ...the quieter you become the more you are able to hear...

                                  Comment

                                  • atsio
                                    Badcaps Veteran
                                    • Oct 2013
                                    • 819
                                    • Greece

                                    #18
                                    Re: IBM R50e schematics

                                    Which ADP charger IC are you using as replacement?

                                    Comment

                                    • atsio
                                      Badcaps Veteran
                                      • Oct 2013
                                      • 819
                                      • Greece

                                      #19
                                      Re: IBM R50e schematics

                                      From the charger datasheet:

                                      "System Current Sense
                                      An uncommitted differential amplifier is provided for additional
                                      high side current sensing. This amplifier, AMP2, has a fixed gain
                                      of 50 V/V from the SYS+ and SYS– pins to the analog output at
                                      ISYS. ISYS has a 1 mA source capability to drive an external
                                      load. The common-mode range of the input pins is from 4 V to
                                      VCC. This amplifier is the only part of the ADP3806 that
                                      remains active during shutdown. The power to this block is
                                      derived from the bias current on the SYS+ and SYS– pins."

                                      Comment

                                      • rtstorm
                                        Badcaps Veteran
                                        • Feb 2012
                                        • 971
                                        • Croatia

                                        #20
                                        Re: IBM R50e schematics

                                        I use the same ADP3806 charger.

                                        So it must have some output when laptop in stand by?
                                        ...the quieter you become the more you are able to hear...

                                        Comment

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