820-01700 no power 5V 0.22amp no dfu SOLVED

[Jeffotskie26]

got very slight corrosion on some caps (ssd area) but nothing serious (no shorted found)
all coils related to ssd are good nothing shorted.
all other bigcoils not including cpu area is good aswell.
unable to boot on dfu mode.

all usb c ports got same behaviour 5.19v-.22amp freeze. using orig 87w charger

U6960 VIN 0.6V and EN 0V not shorted
PPBUS_G3H 0.6v 0.216ohms
PP3V3_G3H_RTC_REG_R 0.1v 0.415ohms

tried my luck by replacing u6960 and u7000 nothing changes.

 

[2informaticos]

"using orig 87w charger"
This machine requires 96W charger!

Why did you touch U6960?
PPBUS_G3H MUST appear before 3V3_G3H_RTC.
Do you get 5V at R7020?
Check U7000 basic voltages.

 

[Jeffotskie26]

R7020 5V ok

U7000 basic voltages:
P_IN 5V
AUX_DET 1.2V
VDDA/P 5V
SMC_RST_IN 0V
A/BMON 0V

 

[2informaticos]

Did you test with 96/140W charger?

 

[Jeffotskie26]

96/140W charger?

is this really required? i fixed alot of a2141s using my 87w charger with no issues.

 

[Jeffotskie26]

this can be u7800 by not getting ppbus and 3v3_g3h?

 

[2informaticos]

A2141 turns on with 87W, if battery still holds some charge.
Get correct adapter first.

U7800 can't work before PPBUS_G3H is generated.

 

[Jeffotskie26]

update:
injecting v on ppbus found leak on CA780 (PPBUS_HS_GPU)
after i removed ca780 now ppbus is 5.2V still no voltage on 3v3_g3h area
also still not turning into dfu mode.

 

[2informaticos]

Check Q7030/40...

 

[Jeffotskie26]

Check Q7030/40...

your right, u7000 pin1 CHGR_GATE_Q4 is not connected properly from isl9240
now im getting 20v on my charger and ppbus is 12.6V

 

[Jeffotskie26]

board works properly now. thanks @2infomaticos