820-00426 - charging circuit - U7100 gets warm

[Rper123]

Hi,
Came in with U7100 blown. Replaced it, Q7130, Q7135, Q7155 and R7105 (measured kohm instead of 20ohm) also. U7100 got warm so I replaced Inrush Limiter mosfets from a donor board (in this model there are 2 mosfets but in schematics it shows only one - Q7180). U7100 still gets warm. Measured resistance on every pin on U7100 and nothing is wrong.
I tried charging the battery and CHGR_PHASE measures about 13,2V which normally is 12,6V.

 

[2informaticos]

"19=4,99V
20=4,6V"
Seems to have bigger difference than expected there.
Try abother ISL6259.
Be sure C7125 is OK.

 

[2informaticos]

"replaced U7100 and after plugging power"
NEVER do this again.
After replacing burnt component, check first in diode mode around it.

This "short" may not exist; is how the chip blocks high-side MOSFET, when detects a problem.
Did you check C7125?
R7121/22 can both burn only if bad ISL6259; less chance that C7121/22 get shorted at same time...

 

[Rper123]

I have checked in diode mode first
It seems that replacing U7190 (P5V1) was the problem all the time. Now stable 5,1V at P5V1_CHGR_VDD and P5V1_CHGR_VDDP.
U7100 doesn't get hot and the battery is charging.
Thanks a lot for your help