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missing PM_SLP_S5_L on a 820-4924a

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  • missing PM_SLP_S5_L on a 820-4924a

    no liquid damage signs anywhere, not dropped. at first all rails were present, cpu becoming warm but no spin. after a bit it went worse. 5vs5 and 3.3sv5 present, but PM_SLP_S5_L so no 5vs4. no corrosion sign anywhere.

  • #2
    Don't get any pulse at PM_SLP_S5/4_L?
    PM_SLP_SUS_L present?
    Are you using original Apple charger, 60/85W?
    Check SMC_ADAPTER_EN, PM_BATLOW_L and S5_PWRGD...

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    • #3
      PM_SLP_S5 completely 0 no pulse
      PM_SLP_S4 ditto

      brand new original 85 watt. whole charger not just the cable

      SMC_ADAPTER_EN = 3.39v
      PM_BATLOW_L = 3.34v
      S5_PWRGD= 3.32v

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      • #4
        "PM_SLP_SUS_L present?"

        Check RTC signals and PCH_DSWVRMEN, PM_DSW_PWRGD, PM_RSMRST_L.
        PM_PWRBTN_L reacts when you toggle SMC_ONOFF_L?

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        • #5
          SRTCRST# 3,3v
          INTVRMEN# 3.11v
          RSMRST# 3.31v
          PWRBTN# 3.42v

          PM_SLP_SUS_L 3.34v
          PCH_DSWVRMEN 3.34v
          PM_DSW_PWRGD 3.42v
          PM_RSMRST_L 3.31v

          PM_PWRBTN_L 3.42 on normal state 1.02v after shorting SMC_ONOFF_L but once it went to 0.34v

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          • #6
            32KHz oscillation comes out from U1900?

            "PM_PWRBTN_L 3.42 on normal state 1.02v after shorting SMC_ONOFF_L but once it went to 0.34v"
            PM_SLP_S5/4/3_L react at the same moment?

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            • #7
              PM_SLP_S4 and s5 goes up to 3.3 for an instant when you plug in magsafe or when you short SMC_ONOFF_L then back to 0.

              no chanhe on s3 that remains on 0

              on the rtc my scope measures the 25mhz but they are not always present. 25mhz present for a sec, then nothing then back and so, 32khz are present and well stable

              Last edited by Nick; 11-06-2018, 11:37 AM.

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              • #8
                "PM_SLP_S4 and s5 goes up to 3.3 for an instant when you plug in magsafe or when you short SMC_ONOFF_L then back to 0."
                So SMC so power button info to PCH and this one reacts too.
                In this case, check if power supplies controlled by SLP_S5/4 pulse at least; should do it...

                25MHz comes out only when board starts; or tries to do it.

                Check again, better with o-scope, if SLP_S3 pulses at least.
                Last edited by 2informaticos; 11-06-2018, 02:51 PM.

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                • #9
                  i just found out that
                  c2436
                  c2407
                  c2441
                  c2401
                  c2432

                  have been riped off from the board.. but i doubt they are the cause of my issue

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                  • #10
                    also yes 5vs4 and all the stuff commanded by SLP_S5/4 pulse at button press/magsafe insertion

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                    • #11
                      also slp_s3 pulses for a micro instant but i can detect it only with the oscilloscope

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                      • #12
                        i checked the bios chip.

                        spi_mlb_io0_mos1
                        spi_mlb_io1_mos0
                        spi_mlb_io2_wp_l
                        spi_mlb_io3_hold_l

                        are stuck at 50hz.

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                        • #13
                          Check if all power supplies controlled by SLP_S3 pulse too; the _S0 ones.
                          ALL_SYS_PWRGD should pulse too.
                          If not, one S0 supply is bad...

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                          • #14
                            ALL_SYS_PWRGD jumps an instant to 0,4v then back to 0... ugh this is a nightmare

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                            • #15
                              Check U1950 for pulses at pins 7 & 3.

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