820-01949 ppbus_g3h 1v

[Bravo2001]

Hi I'm a new poster to the forum. Have been reading for a while now. But this is my first post so excuse me if not good.

Got a liquid damaged 820-01949 Was already been played with. Found a ISL9239 on the board in stead of a ISl9240. Replaced it off course with a new ISL 9240. But still no PPBUS_G3H. What is needed for u7000 to create PPBUS_g3h?

Please advice where to look.

Measurements:

PPBUS_G3H 1v
PP3v3_g3h 3,3V

USB-C 5V 0,049A.

Thanks in advance.

 

[2informaticos]

First of all, welcome to the forum!

Check diode mode to ground at PPBUS_G3H.
If good, post basic U7000 voltages; P_IN, AUX_DET, VDDA/P, AUX_OK, A/BMON.

 

[Bravo2001]

Hi 2infrmaticos,

Thxs for fast reply:
Diode mode in ppbus_g3h 0.458 measured at f7000 pin 2 (Red pin on ground)

U7000 voltages:
P_IN 5,1V
AUX-DET 1,28
VDDA 5,05
VVDP 5,05
AUX_OK (looks like nc, if you mean pin 28 on u7000?)
Amon 0V
Bmon 0V

 

[2informaticos]

Check all U7000 surrounding components; pay atention to Q/R/C7030/40 and their traces.

Be sure to have good solders and traces.
Try known good ISL9240.

 

[Bravo2001]

Yesss, it was the Q7040. Replaced it from a donor board and it works perfectly!!

thxs 2Informaticos