820-00281 - No PPBUS 5V

[menatwork]

MB with no water damage, just stop work.
Here is some measurements and i hope you guys can give me some direction.

No short to ground on PPBUS_G3H


Diode Mode (red prob to ground)

------- U3200 Powerline
C3200 = 0.376
C3201 = 0.147
C3204 = 0.527
C3205 = 0.497
C3206 = 0.536
C3208 = 0.526
------- U3100 PowerLine
C3100 = 0.376
C3101 = 0.156
C3104 = 0.527
C3105 = 0.498
C3106 = 0.534
C3108 = 0.518


------- UB300 PowerLine
CB300 = 0.376
CB301 = 0.157
CB304 = 0.527
CB305 = 0.071
CB306 = 0.536
CB308 = 0.493
------- CB400 Power Line
CB400 = 0.376
CB401 = 0.156
CB404 = 0.527
CB405 = 0.498
CB406 = 0.536
CB408 = 0.521


J3300
5.20V (Power Meter) On and OFF

JB500
5.20V (Power Meter) Static
PPBUS_G3H = 0
PP3V3_G3H = 3.4V goes to 3.3V after a two second and stay in loop

Thank you

 

[2informaticos]

"CB305 = 0.071"
Bad UB300, if the cap is good...

 

[menatwork]

I replaced UB300 and i got 0.453
However, still doing the same thing:
J3300
5.20V (Power Meter) On and OFF

JB500
5.20V (Power Meter) Static
PPBUS_G3H = 0
PP3V3_G3H = 3.4V goes to 3.3V after a two second and stay in loop

 

[2informaticos]

Did you solder exact same chip code?
You probably have another bad CD3215, or maybe bad solders on the changed one.

 

[menatwork]

Yes.
What about the U3200 and U3100? Do you think the problem is just one ?
What else can i look to make sure that is the real problem?

 

[2informaticos]

You must be sure all chips are good and properly soldered.
If the problem is on the main power suplly, or some secondary supply, then all USB-C ports should have the same behaviour.
If you get one port with different symptom, that should point to an issue on the USB-C circuitry.