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820-01700-A No power 20.25V 0.040mA

J

javier_herart

Member
Hello.
Received this macbook:
  • Slightly liquid damaged around: CA780 (basically destroyed, I removed it) and U7100.
  • It switches to 20.25V and takes 0.040mA and nothing else.
Can you advise on what measures to start with?
 
2informaticos

2informaticos

Administrator
Staff member
Check T2's SLPS2R and AWAKE voltages; the small coils around U7800.
Also check G3S and SSD power rails.
 
J

javier_herart

Member
SLPS2R:
PP0V8_SLPS2R: 0.78V
PP1V1_SLPS2R: 1.1V
PP1V8_SLPS2R: 1.79V

AWAKE:
PP1V8_AWAKE: 1.8V
PP3V3_AWAKE: 3.3V
PVDDCPUAWAKE_SW0: 0.76V

Coils around U7800
P0V9SLPDDR_SW1: 0.89v
P0V9SLPDDR_SW0: 089V
P1V1SLPS2R_SW0: 1.1V
P1V1SLPS2R_SW1: 1.1V
P1V8SLPS2R_SW0:1.8V
PVCCPRIMCORE_SW1: 0V
PVCCPRIMCORE_SW0: 0V
P0V8SLPDDR_SW0:0.8V
P0V8SLPDDR_SW1: 0.8

G3S
PP5V_G3S: 5V
PP1V8_G3S: 1.8V

SSD;
PP2V5_NAND_SSD0: 2.5V
PP1V8_SSD0: 1.8V


Please let me know if I am missing any measurement
 
2informaticos

2informaticos

Administrator
Staff member
Liquid sign on the CPU power supply area is not a good thing.

Check diode mode to ground on all big coils; compare with good board.

Is the machine recognized into DFU?
 
J

javier_herart

Member
DFU Mode is returning 4014 error when reviving, (But yes, machine is recognized in DFU).
I tried several times with different cables.

Any help? Thanks
 
J

javier_herart

Member
PVCCIO_PHASE: 0.123V(compared to 0.076)
PP5V_G3S: 0.387 (compared to 0.405)
PVDD075GPU_PHASE: 0.032 (compared to 0.050)
PVDDIOMEMGPU_PHASE1: 0.032 (compared to 0.048)
PVDDIOMEMGPU_PHASE2: 0.032 (compared to 0.048)
PPVDDCIMEM_GPU_R: 0.59V (compared to 0.089).

All other measure almos same as reference
You see something bad?
 
2informaticos

2informaticos

Administrator
Staff member
These values are not really bad.
However, I suspect CPU; as you found corrosion on its power supply.

Is also possible to have accumulated crap underneath one of BGAs.
 
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