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

 

[2informaticos]

"I just checked all of the SPI Bus series termination resistors."
Did you check continuity between them?

"I also noticed the pad SPI_MISO_R completely burnt"
Did you fix that?

 

[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 ...

 

[2informaticos]

"I deduced that the continuities are good ...?"
You MUST check continuity between their pins.
Some traces are inside the board, as few resistors are placed far away, on the PCH opposite side of board.