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820-4924 - Suddenly no power - missing PP5V_S3

R

ronaldo

Member
Hi everyone.
Help please

No signs of liquid and no physical damage to the board.

L7130 - CHGR_PHASE - 12.58V
L7195 - P5V1_SW - 3.33V
L7430 - PPDDR_S3_REG_R - 0V
L7320/10 - CPUVR_PHASE1/2 - 0V
L7630 - PP1V05_S0_REG_R - 0V

PPBUS_G3H - 12.58V
PPVRTC_G3H - 3.33V
PP3V3_S4 -0V
PP5V_S3 - 0V
PM_SLP_SUS_L - 0V
3V3_SUS - 0V
PM_RSMRST_L - 0V

P5VS4_EN at 0V
PM_SLP_S5_L at 0V, no pulse when toggle SMC_ONOFF_L

THANKS
 
2informaticos

2informaticos

Administrator
Staff member
No idea about 3V3_S5, which is very important.
Why do you bother checking RAM and CPU voltage, if missing 3V3_SUS?

Using 60/85W original Magsafe 2 charger?
 
R

ronaldo

Member
Checking RAM and CPU voltage because I'm still leaning which lines come first.
So, I rather give all information beforehand.

PP3V3_S5 - 3.34V
Using 60W original MagSafe 2 charger
 
R

ronaldo

Member
PM_BATLOW_L - 3.33V
PM_DSW_PWRGD - 3.40V
PCH_DSWVRMEN - 2.72V
SMC_ADAPTER_EN - 3.37V

PCH_CLK32K_RTCX1 - 0.36V
PCH_SRTCRST_L - 3.32V
PPVOUT_S0_PCH_DCPRTC -0V Diode mode 0.148
PPVRTC_G3H - 3.33V

RTC_RESET_L - 3.32V
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
"the 4 PCH's RTC signals"
You've find two only...

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 boards.rossmanngroup.com
 
2informaticos

2informaticos

Administrator
Staff member
Then you have bad PCH.

Just in case, heat it with good flux.
May be lucky and has accumulated crap underneath.
 
2informaticos

2informaticos

Administrator
Staff member
PCH gets all needed signals, but doesn't release PM_SLP_SUS_L.
It must have some internal damage...

I don't understand why do you insist to check other voltage which should appear after 3V3_SUS.
 
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