820-00850 5V 0.10-0.4A Cycle

[ChronoInfo]

History no liquid damage board stopped work no reason

PPBUS_G3H pulse 7V - 12.30V
PP3V3_G3H pulse
Remove F7000 PP3V3_G3H 0V no pulse
Noticed only U3000 get hot with F7000 present (158F with thermal camera)

 

[2informaticos]

First of all, welcome to the forum!

U3000 should be bad, if reaches 70 degrees Celsius.
That could be caused by bad/fake charger.
Check diode mode to ground on U300 pins; compare with good board, if possible.

All USB-C ports have exact same behavior?
Test them flipping the cable too.

Also check diode mode to ground on all big coils.
Don't forget L9080.

"PP3V3_G3H pulse"
Do you mean L6900, or L7660?

 

[ChronoInfo]

First of all, welcome to the forum!

U3000 should be bad, if reaches 70 degrees Celsius.
That could be caused by bad/fake charger.
Check diode mode to ground on U300 pins; compare with good board, if possible.

All USB-C ports have exact same behavior?
Test them flipping the cable too.

Also check diode mode to ground on all big coils.
Don't forget L9080.

"PP3V3_G3H pulse"
Do you mean L6900, or L7660?

Hello, Thanks

i don't have good board for compare, i've check all pins of U3000 pin 20 seem very low 0.044V diode mode
All USB-C ports exact same behavior and test flipping the cable

L7660 is very low 0.044V
L9080 diode mode 0.370V

for PP3V3_G3H pulse at L7660

 

[2informaticos]

Remove U3000 and check if diode mode reading on 3V3_G3H power rail goes higher.
If yes, test if board boots.

BTW, write directly into bottom reply box, instead of clicking Reply button.
Please, maintain forum aesthetic...

 

[ChronoInfo]

pin 20 when U3000 remove : 0.414V diode mode
Tried plug charger i've 5V 0.25A
now PPBUS_G3H 12.26V and PP3V3_G3H 3.32V stable

 

[2informaticos]

Is it recognized in DFU mode?