820-3437 sometimes it is turned off when logging in, others when the apple is charging.

Mac Tech

Member
hello greetings to all is my first post, if I did something wrong I hope you understand and correct me so as not to make the same mistake again. Thanks in advance.

PPbus_G3H : 8.60V
SMC_Reset_L 3.0v
SMC_Manual_rst_L 0.86 V

Connected to the source the machine makes its three ignition cycles, for a while it turns off and the consumption drops to 0.016 ma.

PM_SLP_SUS_L missing 0 V

PPVRTC_G3H: 3.32 V
RTC_RESET_L: 3.24 V
PCH_SRTCRST_L: 3.24 V
PCH_INTVRMEN_L: 1.5 V
PCH_DSWVRMEN_L: 2.38 V
SYSCLK_CLK32K_RTCX1: 545 mv
PP3V3_S5: 3.32 V
PM_DSW_PWRGD: 3.41 V
PP3V3_SUS: 0V
PM_BATLOW_L: 3.25 V
PM_RSMRST_L: 0 V
PM_PWRBTN_L: 1.0 V

I am beginning to believe that it is a faulty smc as a rare thing.
 

2informaticos

Administrator
Staff member
First of all, welcome to the forum!

For PCH's RTC signals, you've forgot to check PCH_INTRUDER_L.
Any fault history available?
Did you try another charger?
 

Mac Tech

Member
Thank you.

Sorry.

I run here (PCH_INTVRMEN 2.25 V)
PCH_INTRUDER_L: 1.5V

machine without liquid fall.
 

2informaticos

Administrator
Staff member
"PCH_INTRUDER_L: 1.5V"
That's the problem.
Possibly accumulated crap underneath PCH, on its RTC area.
You can heat PCH area using quality flux; no more than 180-200 degrees, for 15-20s.
 

2informaticos

Administrator
Staff member
That is bigger problem even: SMC is kept in reset mode.
Change C5101 and inspect the area for corrosion.
Pins 5 & 6 of U5110 are both high?
 

2informaticos

Administrator
Staff member
Wait, I just saw you have correct SMC_RESET_L.
Check if board tries to start doing SMC reset from keyboard; better using C5125 pads.

If PCH_INTRUDER_L is still low, force it with 47-100K, instead of 1M; can test with 1K also.
 
Top