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820-2132-A, A1229 blinking light on magsafe

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    #21
    Re: 820-2132-A, A1229 blinking light on magsafe

    Originally posted by dellxps15 View Post
    if it was a newer model we could see if current resistor were ok, but here it use ISL6255AHRZ and different layout. tomorrow ill see datasheet and see if we can find some news

    edit: check if R7905 is 18 ohm
    Hi
    Thanks I'll check and report

    Comment


      #22
      Re: 820-2132-A, A1229 blinking light on magsafe

      Originally posted by dellxps15 View Post
      if it was a newer model we could see if current resistor were ok, but here it use ISL6255AHRZ and different layout. tomorrow ill see datasheet and see if we can find some news

      edit: check if R7905 is 18 ohm
      I checked R7905 and it is 18.1 ohm

      Comment


        #23
        Re: 820-2132-A, A1229 blinking light on magsafe

        check R7904, R7906

        Comment


          #24
          Re: 820-2132-A, A1229 blinking light on magsafe

          Originally posted by dellxps15 View Post
          check R7904, R7906
          ok i will check
          but can you let me know if c7196 is not there would this cause the half fan spin problem

          Comment


            #25
            Re: 820-2132-A, A1229 blinking light on magsafe

            according to solder on it u can spot if something was present, but according to schematic it should be there

            Comment


              #26
              Re: 820-2132-A, A1229 blinking light on magsafe

              Originally posted by dellxps15 View Post
              according to solder on it u can spot if something was present, but according to schematic it should be there
              Would this missing component be causing the problem

              Comment


                #27
                Re: 820-2132-A, A1229 blinking light on magsafe

                nope

                Comment


                  #28
                  Re: 820-2132-A, A1229 blinking light on magsafe

                  Ok i just checked
                  R7906 is 2.4 ohms
                  R7904 is 000.2 ohms

                  On the schematic it says R7904 should be 220 ohms in one place but in another place in a box, says something different

                  Should this be 0 hms or 220 ohms
                  Please
                  Thanks

                  Can anyone measure on a good board please
                  Thanks

                  Comment


                    #29
                    Re: 820-2132-A, A1229 blinking light on magsafe

                    Originally posted by lcdcaps1 View Post
                    Ok i just checked
                    R7906 is 2.4 ohms
                    R7904 is 000.2 ohms

                    On the schematic it says R7904 should be 220 ohms in one place but in another place in a box, says something different

                    Should this be 0 hms or 220 ohms
                    Please
                    Thanks

                    Can anyone measure on a good board please
                    Thanks
                    on schematic they are 2.2 and 270, but in the datasheet https://www.renesas.com/cn/en/www/do...et/isl6255.pdf it report 2.2 and 40 , so one is ok, but the other is not. try remove it and measure without any connection.
                    R7908 is 0.01. maybe it make interference in the measure of r7904

                    Comment


                      #30
                      Re: 820-2132-A, A1229 blinking light on magsafe

                      R7904 is ok. SMD resistors don't fail shorted.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                      Comment


                        #31
                        Re: 820-2132-A, A1229 blinking light on magsafe

                        Originally posted by dellxps15 View Post
                        on schematic they are 2.2 and 270, but in the datasheet https://www.renesas.com/cn/en/www/do...et/isl6255.pdf it report 2.2 and 40 , so one is ok, but the other is not. try remove it and measure without any connection.
                        R7908 is 0.01. maybe it make interference in the measure of r7904
                        hi
                        thanks for the reply
                        i will check and report back
                        would this be the cause of it not turning on fully
                        what do you think please
                        thanks again

                        Comment


                          #32
                          Re: 820-2132-A, A1229 blinking light on magsafe

                          so which resistors do i need to recheck and remove

                          Comment


                            #33
                            Re: 820-2132-A, A1229 blinking light on magsafe

                            Hi all

                            Comment


                              #34
                              Re: 820-2132-A, A1229 blinking light on magsafe

                              Originally posted by dellxps15 View Post
                              on schematic they are 2.2 and 270, but in the datasheet https://www.renesas.com/cn/en/www/do...et/isl6255.pdf it report 2.2 and 40 , so one is ok, but the other is not. try remove it and measure without any connection.
                              R7908 is 0.01. maybe it make interference in the measure of r7904
                              Do you have any other ideas pls

                              Comment


                                #35
                                Re: 820-2132-A, A1229 blinking light on magsafe

                                Hi
                                attached image is a screen shot from the schematic that shows r7904 is to be 0 ohm
                                not sure if Mine is measuring correctly because the schematic shows two different values for r7904
                                Attached Files

                                Comment


                                  #36
                                  Re: 820-2132-A, A1229 blinking light on magsafe

                                  I have been doing more measurements
                                  I have found pm_s4_state_L gives me 3.2v when the fan spins but when it stops goes to 0v

                                  Comment


                                    #37
                                    Re: 820-2132-A, A1229 blinking light on magsafe

                                    My PPVCORE_S0_CPU is shorted to 0.4 0hm

                                    Comment


                                      #38
                                      Re: 820-2132-A, A1229 blinking light on magsafe

                                      post u7100 voltage.

                                      it charge battery ? it work with battery only ?

                                      Comment


                                        #39
                                        Re: 820-2132-A, A1229 blinking light on magsafe

                                        Originally posted by dellxps15 View Post
                                        post u7100 voltage.

                                        it charge battery ? it work with battery only ?
                                        Hi
                                        I dont know about charging battery
                                        which voltages do you need regarding u7100

                                        Comment


                                          #40
                                          Re: 820-2132-A, A1229 blinking light on magsafe

                                          I have tested the s0 rails for ohms
                                          and they are below
                                          PP5V_S0 2.245k ohm
                                          PPVCORE_S0_CPU 0.5 ohm
                                          PPVCORE_S0_NB_GFX 42.1 ohm
                                          PP3V3_S0 0.7k ohm
                                          PP1V8_S0 1.3k ohm
                                          PP1V5_S0 462 ohm
                                          PP1V25_S0 130 ohm
                                          PP1V05_S0 26.3 ohm
                                          PPVCORE_S0_NB_R 26.1 ohm
                                          PP0V9_S0 1.4k ohm

                                          Comment

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