820-3476-A 16mA

[mbcontrol]

I'm working on a water damaged 820-3476-A. I did a lot of work, cleaning the board and changing this parts:
C5120, C7095, C7102, R7095, R7096, C3740, C2951, R7080, C5131, C1950, Q7520, Q5490, R5491, R5492, Q5480, R5481, R5482, U5110.

I did a reflow for U5000.

The naked board starts with 36mA for half a second, falls down to 9mA and goes up to 16mA after a second. Green light flashes for 2 Seconds and then orange light stable.
After soldering Q5490 und Q5480 the board was a bit warm and it took for one start something between 200-300 mA and the ventilator was running. This was only one time.

Here are my measurements:
PPBUS_G3H = 8,6v
PPBUS_S5_HS_COMPUTING = 8,6v
PPBUS_S5_HS_OTHER5V = 8,6v
PPBUS_S5_HS_OTHER3V3 = 8,6v
PPDCIN_G3H_ISOL = 19,0v
PPDCIN_G3H = 19,0v
PP3V42_G3H = 3,42v
PPVRTC_G3H = 3,3v
PP5V_S5 = 5,0v
PP5V_S4 = 0,0V
PP5V_S0 = 0,0v
PP3V3_S5 = 3,3v
PP3V3_S4 = 0,0v
PP3V3_SUS = 0,0v
PP3V3_S3 = 0,02v
PP3V3_S0 = 0,1v

P5VS4_DRVH = 0,0v
PM_SLP_S4_L = 0v

My troubleshooting has now stalled. It would be great if you could help me further.

 

[2informaticos]

Check PM_BATLOW_L, PCH_DSWVRMEN, PM_DSW_PWRGD, PM_RSMRST_L, SMC_ADAPTER_EN and the 4 PCH's RTC (DC) signals.

Original 60/85W Magsafe 2 charger?
Did you test with lab PSU, or fake charger too?

 

[mbcontrol]

PM_BATLOW_L = 3.3v
PCH_DSWVRMEN = 3.2v
PM_DSW_PWRGD = 3.4v
PM_RSMRST_L = 0.0v
SMC_ADAPTER_EN = 3.38v

I found these PCH RTC signals - did you mean this? Sorry for stupid asking :-(
PCH_CLK32K_RTCX1 = 0.4v
PCH_SRTCRST_L = 3.3v
PPVOUT_S0_PCH_DCPRTC = 1.4v

I was testing with lab PSU and Magsafe2 cable from a 85W. Also with Original 85W Magsafe2 - same behavior.

 

[2informaticos]

I specified 4 DC signals...

"PCH_SRTCRST_L = 3.3v"
Nothing more appears close to it (in the same PCH block)?

 

[mbcontrol]

This three are shown together on page 72 in the schematic:
PCH_SRTCRST_L = 3.3v
PCH_CLK32K_RTCX1 = 0.4v
RTC_RESET_L = (3.3v
These are the only signals with PCH and RTC in the name (searching in FlexBV).

Searching for RTC only, i found this two signals more:
PPVOUT_S0_PCH_DCPRTC = 1.4v
PPVRTC_G3H = 3.3v

Maybe i have a shitty boardview and schematic for this board? Should I look for someone else?

 

[2informaticos]

We've talked many times about RTC signals on the forum.

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

boards.rossmanngroup.com

The mentioned signals go to RTC block; didn't say to have RTC in name!

Just in case, check SMC_S5_PWRGD_VIN too.

Missing PM_SLP_SUS_L, having all previous signals OK, points to PCH problem.
However, we are still pending about PCH_INTRUDER_L and PCH_INTVRMEN.

 

[mbcontrol]

Ok, thanks for the clarification because of the RTC signals. Here are the missing values ...

SMC_S5_PWRGD_VIN = 3.38v
PCH_INTRUDER_L = 3.0v
PCH_INTVRMEN = 3.2v

 

[2informaticos]

Possibly accumulated crap underneath PCH.
Try heating it with quality flux.