820-00239 - 5.17V 0.07A after coke spill in charge port

[Atomrepair]

According to customer, a tiny bit of coke was spilled into a charge port. I can't find any corrosion on the board or on the ports themselves.

measurements​	​
PPDCIN_G3H​	5,18V​
P3V3_G3H​	0,9V, stable​
F7000 PPBUS_G3H​	0V, no short​
SMC_RESET_L​	0V, no short​
BUF_SMC_RESET_L​	0V, no short​
PP20V_USB_XXXXX​	All 4 are stable 5.17V​
Steady 5.17V at R7020 (no pulse)​	​
​	​
U3200​	​
PP1V8_UPC_XB_LDOD​	0,45​
PP3V3_UPC_XB_LDO​	0,41​
PP1V1_UPC_XB_LDO_BMC​	0,46​
PP1V8_UPC_XB_LDOA​	0,49​
​	​
UB400​	​
PP1V8_UPC_XB_LDOD​	0,45​
PP3V3_UPC_XB_LDO​	0,42​
PP1V1_UPC_XB_LDO_BMC​	0,46​
PP1V8_UPC_XB_LDOA​	0,49​
​	​
UB300​	​
PP1V8_UPC_XB_LDOD​	0,46​
PP3V3_UPC_XB_LDO​	0,41​
PP1V1_UPC_XB_LDO_BMC​	0,47​
PP1V8_UPC_XB_LDOA​	0,49​
​	​
U3100​	​
PP1V8_UPC_XB_LDOD​	0,46​
PP3V3_UPC_XB_LDO​	0,41​
PP1V1_UPC_XB_LDO_BMC​	0,47​
PP1V8_UPC_XB_LDOA​	0,49​

Nothing seems to stand out. Where to now?

 

[2informaticos]

SMC requires 3V3_G3H amd SMC_REST_L (at least).
Post basic voltages for U7000; TBA_AUX_DET, TBA_VDDA/P, PPVIN_G3H_P3V3G3H, PM_EN_P3V3_G3H.

 

[Atomrepair]

TBA_AUX_DET​	1,27V​
TBA_VDDA​	5,13V​
TBA_VDDP​	5,13V​
PPVIN_G3H_P3V3G3H​	4,81V​
PM_EN_P3V3_G3H​	5,12V​

 

[2informaticos]

So you have a problem on U6903 area; post its voltages.
Don't forget to check diode mode at C6906/12.

 

[Atomrepair]

PP3V3_G3H_REG_R is shorted to GND. No more time, will follow up on this tomorrow. Thanks for the guidance!

 

[Atomrepair]

Board is fixed - CB300 was shorted to ground.