[SOLVED]820-2879 ppbus

[G.Beard]

Hi.

Old board liquid damaged at some point was worked on and revived.

PPBUS = 1.2V Nothing is hot
UGATE = 1.5V
LGATE = 0V
DCIN pin 2 ISL = 20V
pin 6 ISL 3V42

R7051 = 2R2
R7052 seems OK (shit DMM error )
R7050 seems OK
Q7030 drain = 20V
R7021 and R7022 = 10Ohm
R7020 seems OK


Tried new:
Q7030, Q7035, ISL6259.

Some help please

 

[aprendiz]

Resistance between pins 17-18 and 27-28 from isl, measuring directly from pins on isl you can check if traces are broken... Is this an original charger????

 

[G.Beard]

Broken trace on R2070 side hidden under the mask... I have no idea how it could have corroded mid way between via and resistor so I guess it burned?

Thank you aprendiz

 

[aprendiz]

So it is working now?? Problem solved???