820-00281-A No power, Stuck at 5v

[Sr. Robot]

Hello, i have an 820-00281 that wont turn on. Its taking 5v from the power supply. PPBUS_G3H is not present and PP3V3_G3H is 1.5v.

U6903 has 5v on pin 10 enable. (theres 1 USB port that wont supply the 5v to pin 10). On all the other 3 ports its 5v

 

[2informaticos]

Inspect non-working USB-C port.
Possibly bad CD3215 chip, which also drops 3V3_G3H; post diode mode there.

 

[Sr. Robot]

I swapped the USB ports and the bad one is still in the same place.

The CD3215 with the bad USB port is 0.305v while the other 3 are 0.394v.

 

[2informaticos]

Not idea what you've really meant.

I can suppose you talk about diode mode, but which rail???
BTW, do not write "v" after a diode mode reading; nobody wants to get confused with voltage.

3V3_G3H is the same for all CD3215 chips.
Dificil to understand different readings on the same rail.

 

[Sr. Robot]

Sorry, i measured diode mode on PP3V3_G3H rail for each chip (on C3100, CB300, CB400 AND C3200 caps)

 

[2informaticos]

Is the same rail, you cannot get different values!

Compare diode mode readings on the LDO rails of all CD3215 chips (each has 4).