820-00840 20V 0Amp No PPBUS_G3H

[raainxx]

Hi,
i have this board, very clean no liquid spill, the board have 20V usb c but 0 amp.
I havent PPBUS_G3H no short, I remove F7000
PPDCIN_G3H = 20V
R7020/21=1
SMC_RST_IN=0V
SMC_RESET_R_L=3,3V
PP3V3_G3H=3,3V
I try to change U7000 & Q7030/40 but same problem.
have you an idea please?
thanks
best regards

 

[2informaticos]

Do you get any voltage at C7050, when F7000 is removed?
Check w/ and w/o battery connected.

Check voltage and diode mode to ground at SCL/SDA lines of battery bus.

 

[raainxx]

Hi 2informaticos,
no I haven't any voltage on C7050 when F7000 is removed without battery
but I have 10,99V with battery connected.

I remove battery to check SDA/SCL
SCL = 0,419V in diode mode = 0,300V in voltage mode
SDA = 0,103V in diode mode = 0,200 in voltage mode

 

[2informaticos]

You have a problem with SDA line.
Remove D6950 and check again.

 

[raainxx]

ok i remove D6950 the SDA line come back to 0,419V in diode mode.
I change the diode, all is normal but when I charge the battery, the SDA line come back with the problem issue.
if I stay without D6950, the Mac work well.

edit:
the Mac stop to charge after 2min, the SDA line has a problem, maybe the SMC?

 

[2informaticos]

Battery may be bad and SMC may get damaged, if D6950 is not in place.

 

[raainxx]

ok the battery is good, I test with another good part. I change U7800 and U5000, now the board work well, I test few cycle of charge.
thanks