IBM R50e schematics

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  • rtstorm
    Badcaps Veteran
    • Feb 2012
    • 971
    • Croatia

    #21
    Re: IBM R50e schematics

    i replace again U42 but still nothing, no sign of life. Please what to check next, this is older laptop maybe mains doesnt go over this IC?

    On U41 i have only 16V on pin 22 (V+), all other pin is 0V.
    Last edited by rtstorm; 05-07-2014, 01:50 PM.
    ...the quieter you become the more you are able to hear...

    Comment

    • rtstorm
      Badcaps Veteran
      • Feb 2012
      • 971
      • Croatia

      #22
      Re: IBM R50e schematics

      please take a look at page 69. I have 16V on Q2 and Q6 pins 7 and 8. All other pin is 0V. How is this controlled?
      ...the quieter you become the more you are able to hear...

      Comment

      • rtstorm
        Badcaps Veteran
        • Feb 2012
        • 971
        • Croatia

        #23
        Re: IBM R50e schematics

        i suspect at U41 (MAX 1631AEAI). It has only 16V on pin 22 (V+) and nothing else. As i figured this U41 need to send VCC3M and VCC5M to H8S (U23) and TSURUMAI (U61) but it doesn't.

        Am i thinking in the right way?
        ...the quieter you become the more you are able to hear...

        Comment

        • rtstorm
          Badcaps Veteran
          • Feb 2012
          • 971
          • Croatia

          #24
          Re: IBM R50e schematics

          hi, i replace U41 but still no power. I am going crazy, is this TSURUMAI (U61) fail? I do not understand this king of fail.

          Please help
          ...the quieter you become the more you are able to hear...

          Comment

          • rtstorm
            Badcaps Veteran
            • Feb 2012
            • 971
            • Croatia

            #25
            Re: IBM R50e schematics

            hi, i replace U61 (TSURUMAI) no help please any idea?
            ...the quieter you become the more you are able to hear...

            Comment

            • atsio
              Badcaps Veteran
              • Oct 2013
              • 819
              • Greece

              #26
              Re: IBM R50e schematics

              What is the voltage on pin 4 of Q34 and Q36? Give also resistance to ground without power supply connected on pins 1,4,8 of Q34 and Q36.

              Comment

              • rtstorm
                Badcaps Veteran
                • Feb 2012
                • 971
                • Croatia

                #27
                Re: IBM R50e schematics

                Q34 pin 4 - 2.85V
                Q36 pin 4 - 10.40V

                Q34 pin 1 - GND = 0.6Mohm
                Q34 pin 4 - GND = 1.1Mohm
                Q34 pin 8 - GND = 201kOhm

                Q36 pin 1 - GND = 201kOhm
                Q36 pin 4 - GND = 1.2Mohm
                Q36 pin 8 - GND = 24MOhm
                ...the quieter you become the more you are able to hear...

                Comment

                • atsio
                  Badcaps Veteran
                  • Oct 2013
                  • 819
                  • Greece

                  #28
                  Re: IBM R50e schematics

                  What is the voltage on pins 1 and 3 of Q32 and resistance to ground without power supply on those pins and all the pins of U42?

                  Comment

                  • rtstorm
                    Badcaps Veteran
                    • Feb 2012
                    • 971
                    • Croatia

                    #29
                    Re: IBM R50e schematics

                    Q32 pin1 - 0.19V
                    Q32 pin 3 - 0V

                    Q32 pin 1 - GND = 39kOhm
                    Q32 pin 3 - GND = 39kOhm

                    U42:
                    pin1 - 24Mohm
                    pin2 - 116kOhm
                    pin3 - 201kOhm
                    pin4 - 38.7kOhm
                    pin5 - 10.8kOhm
                    pin6 - 22MOhm
                    pin7 - 2.2Ohm
                    pin8 - 16.7kOhm
                    pin9 - 33kOhm
                    pin10 - 9.7kOhm
                    pin11 - 35Mohm
                    pin12 - no connection to GND (0)
                    pin13 - 2.4Ohm
                    pin14 - 11.3Mohm
                    pin15 - 16.7kOhm
                    pin16 - 10.8kOhm
                    pin17 - 10.5MOhm
                    pin18 - 11.5MOhm
                    pin19 - 2.2ohm
                    pin20 - 7.8MOhm
                    pin21 - 30kOhm
                    pin22 - no connection to GND (0)
                    pin23 - no connection to GND (0)
                    pin24 - 10.8MOhm
                    ...the quieter you become the more you are able to hear...

                    Comment

                    • atsio
                      Badcaps Veteran
                      • Oct 2013
                      • 819
                      • Greece

                      #30
                      Re: IBM R50e schematics

                      Check voltages on pins 57,34, 55, 52, 54, 10, 11, 44, 58, 59 of U61

                      Comment

                      • rtstorm
                        Badcaps Veteran
                        • Feb 2012
                        • 971
                        • Croatia

                        #31
                        Re: IBM R50e schematics

                        U61:
                        pin57 - when measuring voltage grow from 0V to 3.19V stable at 3.19V
                        pin34 - 3.21V
                        pin55 - 0V
                        pin52 - 4.2V
                        pin54 - 1V
                        pin10 - 0.2V
                        pin11 - 0.24V
                        pin44 - 0V
                        pin58 - 0V
                        pin59 - 0V
                        ...the quieter you become the more you are able to hear...

                        Comment

                        • atsio
                          Badcaps Veteran
                          • Oct 2013
                          • 819
                          • Greece

                          #32
                          Re: IBM R50e schematics

                          Check voltage and resistance to ground (with out power supply) on all three pins of D10, D19, D23. Check if diodes are ok.

                          Comment

                          • rtstorm
                            Badcaps Veteran
                            • Feb 2012
                            • 971
                            • Croatia

                            #33
                            Re: IBM R50e schematics

                            D10
                            pin1 - -4.4V
                            pin2 - -4.4V
                            pin4 - 3V

                            pin1 - 280kOhm
                            pin2 - 277kOhm
                            pin3 - 176kOhm

                            diode test OK

                            D19

                            pin1 - 2.5V
                            pin2 - 2.5V
                            pin4 - 2V

                            pin1 - 270kOhm
                            pin2 - 270kOhm
                            pin3 - 170kOhm

                            diode test OK

                            D23 - i do not have it on my board, that spot is empty.
                            ...the quieter you become the more you are able to hear...

                            Comment

                            • atsio
                              Badcaps Veteran
                              • Oct 2013
                              • 819
                              • Greece

                              #34
                              Re: IBM R50e schematics

                              Did you had the battery connected while you were taking measurements of voltages?

                              Comment

                              • atsio
                                Badcaps Veteran
                                • Oct 2013
                                • 819
                                • Greece

                                #35
                                Re: IBM R50e schematics

                                Check voltages on all pins of Q13 and on both sides of R422 and R453.

                                Comment

                                • dj_ricoh
                                  Badcaps Legend
                                  • Jan 2013
                                  • 2073
                                  • uk

                                  #36
                                  Re: IBM R50e schematics

                                  i think there is something shorted to ground !
                                  like a cap!
                                  and lift the L5 coil
                                  Last edited by dj_ricoh; 06-10-2014, 08:34 AM.
                                  Just cook it! It's already broken.

                                  Comment

                                  • dj_ricoh
                                    Badcaps Legend
                                    • Jan 2013
                                    • 2073
                                    • uk

                                    #37
                                    Re: IBM R50e schematics

                                    see pin 24 on U42 10Mohms. pff
                                    go to q4 and that coil
                                    Just cook it! It's already broken.

                                    Comment

                                    • atsio
                                      Badcaps Veteran
                                      • Oct 2013
                                      • 819
                                      • Greece

                                      #38
                                      Re: IBM R50e schematics

                                      Originally posted by dj_ricoh
                                      i think there is something shorted to ground !
                                      like a cap!
                                      and lift the L5 coil
                                      What? When all resistances measure allright.

                                      Comment

                                      • rtstorm
                                        Badcaps Veteran
                                        • Feb 2012
                                        • 971
                                        • Croatia

                                        #39
                                        Re: IBM R50e schematics

                                        @ atsio

                                        Q13
                                        pin1 - 2.99V
                                        pin2 - 2.89V
                                        pin3 - 2.89V
                                        pin4 - 1.2V
                                        pin5 - 15.96V
                                        pin6 - 15.96V
                                        pin7 - 15.96V
                                        pin8 - 15.96V

                                        R422 i cannot find (KODIAK program wont display it)
                                        R453 one side is 16.3V and other side is -7.8V

                                        I did not use the battery while i was testing.
                                        ...the quieter you become the more you are able to hear...

                                        Comment

                                        • rtstorm
                                          Badcaps Veteran
                                          • Feb 2012
                                          • 971
                                          • Croatia

                                          #40
                                          Re: IBM R50e schematics

                                          Originally posted by dj_ricoh
                                          see pin 24 on U42 10Mohms. pff
                                          go to q4 and that coil
                                          Q4
                                          pin1 - 0.3V
                                          pin2 - 0.56V
                                          pin3 - 0V
                                          pin4 - 0V
                                          pin5 - 0.3V
                                          pin6 - 0.3V
                                          pin7 - 16V
                                          pin8 - 16V

                                          L5 coil have 0.3V on both side
                                          ...the quieter you become the more you are able to hear...

                                          Comment

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