820-01814 PPBUS_G3H 0.35V and 5V 0.035A from charger

[ajdoc]

5V and 0.035A from charger (96W genuine charger)

There is no liquid damage on the board.

PPBUS_G3H on F7000 got 0.350V (0.030V in diode mode so it is too low).
Removed F7000 and F7001 and on pad 1 of F70001/1 got 1.3V (it is low because it got only 5V on PPDCIN_G3H?) and 0.515V in diode mode).
On pad 2 of F70001/1 got still 0.030V in diode mode).

Any ideas?

 

[2informaticos]

Check if you get 0.030 reading on any big coil too.
Don't forget L9080/580.
Just in case, check diode mode at 3V3_G3H_RTC too.

U7000 can generate 12.3V at C7050 even with just 5V input.
It works in buck, or boost coneverter, as needed.

Do you have the same behavior on all USB-C ports?

 

[ajdoc]

Big coils 0.001V in diode mode and 2.4Ohm resistance to ground.
L9080 0.03V in diode mode.
3V3_G3H_RTC 0.401V in diode mode - checked on R6935.

Same behaviour on all ports.

Noticed a solder ball on the edge Q3100 and D3301.
LDOs on U3100 shows correct readings in diode mode.

 

[2informaticos]

"L9080 0.03V in diode mode."
Remove U9080 and check again diode mode on PPBUS_G3H.
For such low values, better to switch to ohm scale.
SSD is probably dead now...

 

[ajdoc]

PPBUS_G3H got now 0.111V in diode mode.

 

[2informaticos]

So the short remains at L9080.
Dead SSD; at least one NAND is burnt.

0.111 is still low reading for PPBUS_G3H.
Let the board cools down and check again.

 

[ajdoc]

Board was cool.
Thank you very much for all those details - that will help a lot in the future tests and repairs