Samsung SGH-E360 - Charging Part Troubleshooting

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Flow Chart of Troubleshooting
7-6
7-3. Charging Part
Yes
Resolder or replace U502
Check the circuit related to
AUX_ON signal
Resolder or replace U502
Check the circuit related to
V_EXT_CHARGE
Yes
No
Check the U502 pin 10
≒4.2V
Yes
No
U502 pin 3 = "L"?
Yes
No
U502 pin 5 = "L"?
Yes
No
END
Abnormal charging part
Check the U502 pin 1
>4.9V