820-00840 stop working

[bartech]

stuck on 5v
on u3200 and 3100 pp1v1_upc ldo bmc 0v
P3V3_UPC_LDO 3.3V
PP1V8_UPC_LDO 1.8V

u2890
1-3,3
7-3,3
8-3,3

 

[2informaticos]

Any history available?
Did you check PPBUS_G3H and 3V3_G3H voltages?
Test w/ and w/o battery connected.

 

[bartech]

no baterry
ppbus g3h - 0v
3v3 - 0v
whit bat
ppbus - 0v
3v3- 0 v

 

[2informaticos]

Check diode mode to ground on both rails.
Next, remove F7000 and check C7050 voltage.

 

[bartech]

g3h shorted to ground

 

[2informaticos]

Do you mean pin 2/F7000?

 

[bartech]

sorry wrong.
now i see that on my boardview ppbus g3h is the same 3v3
where to check them?
diode mode on
ppbus g3h - 114

 

[2informaticos]

0.114 is too low for PPBUS_G3H.
What about 3V3_G3H?