dell n5010 3.3v ,5v run problem

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  • menshawy
    Badcaps Veteran
    • Aug 2013
    • 400
    • egypt

    #1

    dell n5010 3.3v ,5v run problem

    hi
    dell n5010 power on without 3.3v ,5v run
    u4201
    D +5V_ALW 5V OK
    S +5V_RUN 1.5V
    G 3V
    U 4202
    D +3V_ALW 3V OK
    S +3V_RUN 1.2V
    G 3V
    i think problem in PS_S3CNTRL
    because r4207 pin1 3.36v ok but pin2 0v
    q4202 pin2 3.3v ok
    pin3 3v
    pin5,6 0v
    i change q4202
    and pq5003 and q1801

    help please
    Attached Files
  • stingerchamp
    Badcaps Veteran
    • Sep 2020
    • 425
    • Pakistan

    #2
    Re: dell n5010 3.3v ,5v run problem

    U4201 simple n channel mosfet
    RDS 18.5 mohm

    If you look at schematic unless there is high voltage at gate required to switch on and generate 5vrun with fixed current peak

    C203 status ,check RDS for u4201, c4201 status
    5v run enable is not coming higher at gate u4201

    3.3V_RUN_ENABLE also not coming sufficient at ,u4202

    Hmm nice observations r4207 check ohms increase or not
    Last edited by stingerchamp; 12-24-2020, 08:57 PM. Reason: Gaining knowledge

    Comment

    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india

      #3
      Re: dell n5010 3.3v ,5v run problem

      Check PD4601/4602. Most likely one of them is faulty
      Last edited by mcplslg123; 12-24-2020, 11:21 PM.

      Comment

      • menshawy
        Badcaps Veteran
        • Aug 2013
        • 400
        • egypt

        #4
        Re: dell n5010 3.3v ,5v run problem

        Originally posted by stingerchamp
        U4201 simple n channel mosfet
        RDS 18.5 mohm

        If you look at schematic unless there is high voltage at gate required to switch on and generate 5vrun with fixed current peak

        C203 status ,check RDS for u4201, c4201 status
        5v run enable is not coming higher at gate u4201

        3.3V_RUN_ENABLE also not coming sufficient at ,u4202

        Hmm nice observations r4207 check ohms increase or not
        thanks for replay
        i checked u4201 ,u4202 and changed them
        r4207 is 100kohm ok

        Comment

        • menshawy
          Badcaps Veteran
          • Aug 2013
          • 400
          • egypt

          #5
          Re: dell n5010 3.3v ,5v run problem

          Originally posted by mcplslg123
          Check PD4601/4602. Most likely one of them is faulty
          thanks for replay
          i checked PD4601 ,PD4602 and changed them with no success

          Comment

          • stingerchamp
            Badcaps Veteran
            • Sep 2020
            • 425
            • Pakistan

            #6
            Re: dell n5010 3.3v ,5v run problem

            Let's start measuring signal levels

            Vgs must be high for n channel mosfet u4201

            What is voltage on r4204 both side
            C4201 voltage at pin 1

            R4205 voltage on both sides
            It should be +15v always

            Slp_s3#
            1.5vsus available?
            +V_DDR_REF(0.9V) available?
            Last edited by stingerchamp; 12-25-2020, 06:56 AM. Reason: Power sequence

            Comment

            • menshawy
              Badcaps Veteran
              • Aug 2013
              • 400
              • egypt

              #7
              Re: dell n5010 3.3v ,5v run problem

              Originally posted by stingerchamp
              Let's start measuring signal levels

              Vgs must be high for n channel mosfet u4201

              What is voltage on r4204 both side
              C4201 voltage at pin 1

              R4205 voltage on both sides
              It should be +15v always

              Slp_s3#
              1.5vsus available?
              +V_DDR_REF(0.9V) available?
              r4204 pin1 3.14v
              pin2 14.51v
              c4201 pin 1 3.14
              r4205 both sides 3.14v
              slp_s3# on q4202 pin2 3.3v
              1.5vsus on pl5001 1.5v
              +V_DDR_REF pu5001 pin5 .75v
              thanks

              Comment

              • stingerchamp
                Badcaps Veteran
                • Sep 2020
                • 425
                • Pakistan

                #8
                Re: dell n5010 3.3v ,5v run problem

                Originally posted by menshawy
                hi
                dell n5010 power on without 3.3v ,5v run
                u4201
                D +5V_ALW 5V OK
                S +5V_RUN 1.5V
                G 3V
                U 4202
                D +3V_ALW 3V OK
                S +3V_RUN 1.2V
                G 3V
                i think problem in PS_S3CNTRL
                because r4207 pin1 3.36v ok but pin2 0v
                q4202 pin2 3.3v ok
                pin3 3v
                pin5,6 0v
                i change q4202
                and pq5003 and q1801

                help please
                [

                When power button not pressed

                you will have 0 voltage at q4202 gate pin 2 and left side mosfet will remain off and you have 3v at pin 5,6
                and pin 5 is gate of right side mosfet so
                at pin 5 3v turn on right mosfet and 0v reach at gates of u4201 u4202 u4203

                When power button pressed

                3.3v at q4202 at gate pin 2 of left side mosfet
                Mosfet turn on left side one
                0v reach at pin 5,6
                Pin 5 is gate of right side mosfet
                Which turn off right side mosfet
                Now 15v always comes as run enable for u4201, u,4202 and etc

                15v at gate of u4201 needed for 5v run



                Before power button pressed
                You should have 0v at gate of u4201

                After power button pressed

                You have 15 v always


                Problem: you have 3v at gate of u4201

                Comment

                • mcplslg123
                  Badcaps Legend
                  • Jun 2015
                  • 7262
                  • india

                  #9
                  Re: dell n5010 3.3v ,5v run problem

                  Did you solved this?? I've same mb with exact same problem. Not Looked into it yet.

                  Comment

                  • Sametbey
                    Badcaps Veteran
                    • Jan 2021
                    • 229
                    • Turkey

                    #10
                    Re: dell n5010 3.3v ,5v run problem

                    15v is important, if you don't have 15v, +5V_RUN +3,3 V and others will not come out. PU4601 RT8206 voltage regulator may be defective. if you can't find it, the update in the figure can be applied.
                    Attached Files
                    I'm not happy to be so strong. because it's not humanly

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india

                      #11
                      Re: dell n5010 3.3v ,5v run problem

                      Originally posted by Sametbey
                      15v is important, if you don't have 15v, +5V_RUN +3,3 V and others will not come out. PU4601 RT8206 voltage regulator may be defective. if you can't find it, the update in the figure can be applied.
                      Thanks for your response. +15V is present and i do understand the working principle of Q4202. Pin2 Gate is ok when powered on there is 3.3V, so logically speaking ground should reach pin6. PIn5-6 are connected together, so GND reaches pin5 making 2nd mosfet of Q4202 off-so GND from pin4 should'nt travel to pin3 and there should be 15V approx at pin3 which in turn will enable VS line transfer. AS far as theory is concerned, that's correct but despite all the correct working conditions of Q4202, i'm still getting 3V at pin3 which is wrong.

                      Q4202 replaced but in vain. R4207/R4204/r4205/C4201/R4211/C4207/R4227/C4210 are checked and are good as per schematic.

                      U4201/4202/4203 are good and checked fine as per schematic.

                      Does anyone else can tell me the way forward??
                      Last edited by mcplslg123; 02-14-2021, 11:52 PM.

                      Comment

                      • piernov
                        Super Moderator
                        • Jan 2016
                        • 4435
                        • France

                        #12
                        Re: dell n5010 3.3v ,5v run problem

                        So you have 0V on pin 5 of Q4202?
                        And on one side of R4204 you get 15V on the other 3V?

                        Try removing R4227, R4211 and R4205 to see if something after them is pulling RUN_ENABLE low (just shift them off of one pad). If it's still low you can try removing Q3905 and Q4202 and check again if RUN_ENABLE is low.
                        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                        Comment

                        • mcplslg123
                          Badcaps Legend
                          • Jun 2015
                          • 7262
                          • india

                          #13
                          Re: dell n5010 3.3v ,5v run problem

                          @piernov, yes your observation is right. I already tried removing Q4202/Q3905 before responding here. I've not tried removing the resistors R4205/4211/4227. Will do and update the forum.

                          Comment

                          • mcplslg123
                            Badcaps Legend
                            • Jun 2015
                            • 7262
                            • india

                            #14
                            Re: dell n5010 3.3v ,5v run problem

                            Thanks @piernov. Problem solved. 1.5V SUS was pulling down the run voltage.

                            Comment

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