[SOLVED]820-00165 - Short to ground on PPBUS_G3H

[menatwork]

I check and i don't see any sign of liquid in this board.
I have short to ground on PPBUS_G3H (F7140 - Pin 2).
I plugged the charger and check if i can find some warm component, no luck...
So, i inject Voltage on F7140 pin 2 and nothing happen, but i notice the cable i use for inject voltage start get warm.

I removed:
- R5450
- Q5500
- R7006
- Q3080
- L7130
- Q7130

No luck. The short still there.

Do you guys have any hint for me?

Thank you

 

[dukefawks]

Something must heat up. Is there a short on CPU Vcore?

 

[menatwork]

Yes, i know, but nothing gets warm on ppbus_g3h
So, on PPVCC S0 CPU (C1096) Pin 1 i get 13.8Ω

 

[leonattpcs]

Have you tried freeze spray any where on the board? Never tried it myself on a computer board as I have never head to yet.

 

[menatwork]

No, i never tried that.

 

[menatwork]

So, on PPVCC S0 CPU (C1096) Pin 1 i get 13.8Ω

 

[menatwork]

dukefawks Any hint ? I take a look around the CPU and i can't find any bad caps or something like that.
I watch again a couple videos from larossmann about CPU short to ground, but no lucky.

 

[dukefawks]

Inject voltage on PPBUS, something must get hot, nothing else to say.

 

[Punkedthis]

you can have a short but when you inject 12v on ppbus, how many amps/current is actually going in? 0.2a? 1a? 2a? or 0a?

 

[menatwork]

C7540/82 (lips test) and get a little warm.
I removed and short disappeared.

 

[menatwork]

When i plug the charger, i get PPBUS_G3H (F7140).Pin 1 and 2 i get 3.3v

 

[Punkedthis]

what do you get on L7130 pin 1

 

[menatwork]

Pin 1 and 2 = 3.3V

 

[menatwork]

Update: Q7130 Get really hot. I just replaced. But nothing change.
I have green light
7100 The resistance between pins 17 and 18 - 3.4 ohm
27 and 28 - 20 ohm

 

[menatwork]

SMC_ADAPTER_EN - 3.4V
SMC_RESET_L - 3.4V
SMC_BC_ACOK - 3.4V
PP3V3_s5 - 3.3V

 

[dukefawks]

U7100 is dead.

 

[menatwork]

dukefawks You are right.
I get ppbus!

 

[menatwork]

Done! Works fine