820-00165 No power

[carlosaovalle]

Hi!

No power, orange light.

PPBUS_G3H Shorted to ground. C7431:1 was bad. I removed it now the short is gone. It is ok if I don't replace it. I don't have a donor board now.

thanks

 

[2informaticos]

Machine can work without it.
However, easy to find 68uF on different MacBook scrap boards.
Even 33uF is better than nothing...

 

[carlosaovalle]

Hi!

F7140 voltage on pad 2 was 0.1 the fuse got no continuity, so I soldered a Wire between Pad1 and pad2. (correct me if this is bad) I don't have donor boards yet.

Fan Spin sometimes spin or start spinning after several minutes. No chime or image

Here are some voltages!

PPDCIN_G3H 16.5 V
PP3V42_G3H 3.4 V
PPBUS_G3H 8.6 V
PP3V3_S5 3.3 V
PP5V_S4RS3 5 V
PP3V3_SUS 3.3V
PP1V2_S3 1.2 V
PP1V8_S3 1.8V
PP1V05_S0 0.08V
PPVCC_S0_CPU 0.00V
ALL_SYS_PWRGD 0.27 V

I thing CPU is not being powered.

Thanks

 

[2informaticos]

PM_SLP_S3_L goes high?
Any voltage at L7430/630?

 

[carlosaovalle]

I'm not sure what a "goes high' means but it reads 3.3V

So

PM_SLP_S3_L 3.3v
L7430 1.2v
L7630 0.08 v

 

[2informaticos]

Post U7600 basic voltages; pins 12, 16, 17, 6.
Be sure to have good components and traces on its area.

Just in case, check L7630 diode mode to ground.

 

[carlosaovalle]

Somehow soldering paste landed on C7616 bonding both paths. MacBook is up and running now.

What exactly U7600 is for? CPU's power supply?
Where can I find info about each ic is for?
I got info about most of them but there are a lot that still ignore.

Thanks again.

 

[2informaticos]

That is PCH/CPU power supply.