820-00165 all_sys_pwrgd low

[Instafixx]

Hello,
I have a Macbook 820-00165. Customer said it isnt turning on. When it came to me it turned on just once for sometime and the dead.
Upon inspection i found corrosion at R8159 R8158 R8151 R8152.
Replaced them. Still no success.

I checked all the Power Rails.
I am getting PM_SLP_S3_BUF_L 3.3V at R8167 but ALL_SYS_PWRGD is at 0.6V. Thought it looked fine i replaced R8167 too.

Checked from crap below Q8150 as the corrosion was below it. But nothing there too.
Macbook is drawing around 180Amps.

[MuertoGB]

Re: 820-00165 all_sys_pwrgd low

What are the diode mode readings on each pin on Q8150?

[Instafixx]

Re: 820-00165 all_sys_pwrgd low

What are the diode mode readings on each pin on Q8150?

Red to Ground
Pin#7 is 7.5K Ohms
Pin#6 is 160K Ohms
Pin#5 is 15.75K Ohms
Pin#4 is 1.5M Ohms
Pin#3 is 1.1k Ohms
Pin#1 is 20.7k Ohms

[reformatt]

Re: 820-00165 all_sys_pwrgd low

ALL_SYS_PWRGD is pulled high by PM_SLP_S3_BUF_L via R8167. It can be pulled low via Q8150 or via open drain power good lines from each of these power rails;

P1V8S3
P5VS4RS3
P1V05S0
DDRREG --> PP1V2_S3

Check each supply for shorts/presence, especially P1V8S3 at L7820

[Instafixx]

Re: 820-00165 all_sys_pwrgd low

ALL_SYS_PWRGD is pulled high by PM_SLP_S3_BUF_L via R8167. It can be pulled low via Q8150 or via open drain power good lines from each of these power rails;

P1V8S3
P5VS4RS3
P1V05S0
DDRREG --> PP1V2_S3

Check each supply for shorts/presence, especially P1V8S3 at L7820

Removed Q8150. Issue Solved