PM_SLP_S4_L missing

[DavutAmana]

Hello,

On this board all the power rails for the PM_SLP_S4_L power supply are present but the CPU does not send the signal.

PPBUS_G3H 8,58V
PM_BATLOW_L 3,31V
SMC_RESET_L 3,39V
SMC_PM_G2_EN 3,42V
SMC_ONOFF_L 3,42V
PM_RSMRST_L 3,25V
PM_PWRBTN_L 3,41V
PCH_DSWVRMEN 3,3V
PCH_INTRUDER_L 3V
PCH_INTVRMEN 3,22V
PCH_SRTCRST_L 3,3V
RTC_RESET_L 3,3V

PM_SLP_S5_L = 0V
PM_SLP_S0_L = 0V
PM_SLP_SUS_L = 3,32V

With the multimeter I see a very small 0.5V pulse on the PM_SLP_SX when i short smc_onoff

This board has had repairs on:
- PPBUS_S5_HS_COMPUTING_ISNS
- CHGR_CSO_R_N
- CHGR_CSO_R_R
- SMC_TDI
- SMC_TDO
- SMC_TMS
- SMC_INT_L

I also noticed the pad SPI_MISO_R completely burnt

The board dont work on bypass mode.


Thanks for your help

 

[2informaticos]

"On this board"
???

Check all SPI Bus Series Termionation resistors and their traces.

 

[DavutAmana]

Sorry my english is bad i'm french...

I just checked all of the SPI Bus series termination resistors.
All resistances are good. I did not notice any anomaly

I inform that J6100 has suffered liquid damage.

SMC_TCK and PP3V42_G3H shows traces of burns on J6100

Thanks for your help 2informaticos

 

[2informaticos]

Then clean/remove J6100.

I underscored and bolded "this" waiting to get from you the 820-x code.
"This" is not a valid Apple code!!!

 

[DavutAmana]

I have remove J6100 the problem is already present
Sorry i forgot, it's an 820-00165 my favorite

 

[DavutAmana]

I checked the diode mode everywhere I have 0.40-0.50 v
I deduced that the continuities are good ...? (but maybe my theory is silly?)

I couldn't confirm the connections with SMC, do you want me to remove SMC for verification?

I was wrong sorry it is not SPI_MISO_R but PM_CLKRUN_L burnt.
I cannot be sure that it has a good connection to SMC without removing it.

 

[2informaticos]

Reball/change SMC.
Once removed, check continuity for its pads.
Also try known good working BIOS.

 

[DavutAmana]

I changed the SMC and checked for continuity.
The problem persists.
I replaced the BIOS, the problem persists ...