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]

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.