![background image](http://html.mh-extra.com/html/samsung/sgh-t509/sgh-t509_service-manual_1190201035.webp)
SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
7-7
7-3. Charging Part
Check the U503 pin 1
> 4.9V
Abnormal charging part
END
No
Yes
U503 pin 5 = "L"?
No
Yes
U503 pin 3 = "L"?
No
Yes
Check the U503 pin 10
≒ 4.2V
No
Yes
Check the circuit related to
V_EXT_CHARGE
Resolder or replace U503
Check the circuit related to
AUX_ON signal
Resolder or replace U503
Yes
Yes
Resolder or replace U503
Check the circuit related to
AUX_ON signal
Resolder or replace U503
Check the circuit related to
V_EXT_CHARGE
Yes
No
Check the U503 pin 10
≒ 4.2V
Yes
No
U503 pin 3 = "L"?
Yes
No
U503 pin 5 = "L"?
Yes
No
END
Abnormal charging part
Check the U503 pin 1
> 4.9V