MacBook Pro 16" - 820-01700-A - 5V / 0.02A dead after connecting USB-C docking station

quasimodo

New member
Hey!

History for the board:

water damaged / on top of the case
replaced U3500 + Q3501 - board was working fine

-> usb-c docking station connected on the side of the water damage -> dead -> 5V / 0.02A


ppbus_g3h is 0V


should i just replace the CD3217 or where to start to troubleshoot?
 

2informaticos

Administrator
Staff member
Diode mode to ground on PPBUS_G3H?
Also check diode mode around CD3217 chips.

Any voltage at R7020?
 

2informaticos

Administrator
Staff member
Please, STOP to diagnose by beeps!!!
Check resistance in ohm scale.

BTW, multimeters beep untill 0.050-0.070, depending by model.
 

2informaticos

Administrator
Staff member
CPU core voltage is on L7211/21/31.
Also check on L7410/20 (iGPU core).
Compare ohm readings with the value on PPBUS_G3H.
 

2informaticos

Administrator
Staff member
If no other coils give you same 0.3 ohm to ground, then is safe to inject voltage into PPBUS_G3H.
Start with 1V and increase slowly, if needed.
Set the amp limit on PSU to max.

First be sure you've checked all the coils; don't forget L9080/580.
 
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