820-00138 Green led & orange, but nothing

[raainxx]

Hi,
liquid on this board near U7310, PPBUS short, i remove U7310 & change it, PPBUS is now normal at 12,56V
All rail S5 is good but the rest is at 0V
SMC_PM_G2=3,427V
PP3V42_G3=3,428V
ALL_SYS_PWGD=0V
i don't find any another area liquid spill on the board.
can you help me please?
thanks

 

[2informaticos]

Probably dead CPU, because voltage spike on VCORE.

You should check power on sequence at least.
Do you get 3V3_SUS?
Post S5_PWRGD, PCH_DSWVRMEN, PM_DSW_PWRGD, PM_RSMRST_L, PM_PWRBTN_L, PM_BATLOW_L.
Also check all 4 RTC signals at PCH.
Trigger SMC_ONOFF_L and check for reaction (drop pulse) at PM_PWRBTN_L.

Be sure to use 85W Magsafe 2 charger...

 

[raainxx]

3V3_SUS=0
S5_PWRGD=3,4
PCH_DSWVRMEN=3,21
PM_DSW_PWRGD=0
PM_RSMRST_L=3,26
PM_PWRBTN_L=3,4
PM_BATLOW_L=3,32 without battery
SMC_ONOFF_L=3,42
When i Short SMC_ONOFF_L, PM_PWRBTN_L go to 0 and come back after to 3,4
i use a apple 85W m2
CPU dead?

 

[2informaticos]

"S5_PWRGD=3,4
-------------------
PM_DSW_PWRGD=0"
Check diode mode to ground there.
SMC should pull high this signal.
Try reballing SMC...

 

[raainxx]

sorry it's PM_DSW_PWRGD=3,4

 

[raainxx]

reball the SMC if PM_DSW_PWRGD is high?

 

[JohnB8812]

u7310 sent 12.56 volts to the CPU and this can RIP.

 

[2informaticos]

"When i Short SMC_ONOFF_L, PM_PWRBTN_L go to 0 and come back after to 3,4"
Check if all PM_SLP_Sx_L signals pulse at least, at same moment.

 

[raainxx]

sorry for the late reply
I check all PM_SLP_Sx_L all make a high rise signal to 3,4 when i short SMC_ONOF and come back to 0V
What can i see?

 

[2informaticos]

Then S3/0 voltages should pulse too.

 

[raainxx]

Yes S3 and S0 pulse, is it normal?

 

[2informaticos]

Likely dead CPU then...