Macbook 820-00165 PPBUS_Short

[Instafixx]

Hello,
Firstly a BIG THANK YOU to Mr.Rossman- Have been repairing Macbooks following his videos and guides.
Today i have a Macbook 820-00165 will not Power On.
0V on PPBUS_G3H and shorted to Ground. Removed the Fuse. Checked one by one and found C7620 Short. Replaced that and now the Short is gone.
As soon as i put in a new fuse and powered it on. The fuse burned. I guess there is some short which i am unable to find.

Currently No Fuse on the board.

Voltage on Pin#2 is 0.7V
Voltage on Pin#1 is 8.6V

Requesting help.

 

[2informaticos]

First of all, welcome to the forum!

What is diode mode reading on pin 2/F7140?
Check in both ways, red and black probe on ground.
Compare the values with all big coils (to ground).
You can also check in ohm scale between PPBUS_G3H and each big coil.

 

[Instafixx]

Hello,
Diode Mode Reading of Pin#2 (Meter Set to 2k Scale)
Red to Ground .423
Black to Ground 1.302 .

The values are different when checking L7520 to ground.
L7520 Pin#2
Red to Ground .356
Black to Ground it continuosly increases.

 

[2informaticos]

How can you test diode mode in ohm scale???

Also check on ALL big coils, not just L7520.

 

[Instafixx]

Another Cap was shorted. Removed. Resolved.