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820-2850 dim green light.

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  • 820-2850 dim green light.

    Ok so I got this with quarter fan spin and it went straight to dim green light after a few minutes of diode measurements. With just the charger plugged in.
    pp3v42 = 3.42
    Ppbus_g3h = 0.3v
    Diode mode ppbus_g3h=.489

    R7020 pin1=2.4v
    R7021 pins 1 & 2 in ohms = 1.965 k ohms
    R7022 pins 1 & 2 in ohms = 1.975 k ohms
    R7022 between pins 1 & 2 =0.1
    C7020 resistance on 1&2 =20ohms

    Isl6295 (pins)27/28 20ohms
    Isl6295 (pins)17/18 2.9ohms
    Smc_reset_L =3.3v

    Q7085 Pins 1-4=16.24v
    Q7085 ppdcin_g3h_inrush =2.59v

    Tried with battery g3h=12.5v at fuse f7040

    thank you for your time

  • #2
    Post ISL6259 basic voltages; charger only, no battery...

    Comment


    • #3
      Ok thanks. I’ll get back to you when I get home

      Comment


      • #4
        U7000
        1-chrg_agate=14v
        2-chrg_dcin=16.7
        3-chrg_acin=1.5mv
        4-chrg_vfrq=8.5mv
        5-chrg_iconp=8.4mv
        6-chrg_cell=.8mv
        7-chrg_vcomp=.6mv
        8-chrg_vneg=370mv
        9-chrg_Amon=.1mv
        10-smbuss_smc_bsa_sda=3.38v
        11-smbus_smc_bsa_scl=3.32v
        12-pp3v42_g3h=3.42v
        13-chrg_rst_L=3.1-3.9 fluctuating
        14-smc_bc_acok=140mv
        15-chrg_Bmon=46mv
        16-chrg_bgate=77mv
        17-chrg_cso_n=380mv
        18-chrg_cso_p=380mv
        19-pp5v1_chrg_vdd=6mv
        20-pp5v1_chrg_vddp=6mv
        21-chrg_Lgate=220mv
        22-gnd
        23-chrg_phase=380mv
        24-chrg_Ugate=380mv
        24-chrg_boot=500mv
        25-chrg_sgate=16.4v
        26-chrg_csi_n=.7mv
        27-chrg_csi_p=.7mv

        im sorry I just wanted to give all the info that I could thank you for your time and effort resolving this issue. I know the boards are old. I know they’re worth nothing but I’m taking this opportunity to add to my repair knowledge. Hopefully I will be able to return your kindness in the future thank you and the community

        Comment


        • #5
          "3-chrg_acin=1.5mv"
          There should be aprox 4V.

          "19-pp5v1_chrg_vdd=6mv
          20-pp5v1_chrg_vddp=6mv"
          And 5V there.

          So start checking diode mode (red probe at ground) on these points.
          If nothing strange, then check R7010; could be open, because of corrosion.

          Comment


          • #6
            May I ask you something? When chrg_dcin=16v shouldn’t it output 5v on vdd ? Or am I confused about the operation of this circuit

            Comment


            • #7
              No datasheet available for ISL6259.
              But the other charger chips do not generate VDD untill ACIN is correct.
              Is supposed to be valid for this one too...

              Comment


              • #8
                Ok I’ll take the readings and check R7010

                Comment


                • #9
                  R7010 On pin 1 16.75v on pin 2-20mv
                  r7011 pin 1-20mv
                  i removed Both resistors
                  r7010=29.5k
                  r7011 =38ohms in circuit
                  r7011 =9.25 out of circuit

                  Comment


                  • #10
                    I also did continuity test on a the vías and all test good :/ I thought maybe the via where bad. Odd because I see no sign of water except near touch pad but even that was very little

                    Comment


                    • #11
                      Oddly enough u7000 pin 3 .042v diode mode even when I remove both r7010/r7011 is this right? I have .549 on a 820-3115 board at the same point. The dot being pin 1

                      Comment


                      • #12
                        "r7011 =38ohms in circuit"
                        Remove C7011.
                        If works, you are lucky; not even need to change it.
                        If not, change ISL6259.

                        Comment


                        • #13
                          Ok so I remove c7011 I get 16.6v on pin 2 of r7010 to isl6295 I’m guessing it’s not good any longer

                          Comment


                          • #14
                            Can I use a similar one from 820-3115b ?

                            Comment


                            • #15
                              C7011 is not critical, let it out.
                              But need to replace R7011, seems to be bad.
                              Or maybe broken/corroded trace.
                              You should get aprox 4V there.

                              Comment

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