Charging Part - Samsung SGH-E390 Service Manual

9-3. Charging Part

Abnormal charging part
Check the U505 pin 16
Check the U505 pin 15
Yes
> 4.9V
Yes
U505 pin 12 = "L"?
Yes
U505 pin 4 = "L"?
Yes
≒ 4.2V
Yes
END
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Check the circuit related to
No
No
Resolder or replace U505
Check the circuit related to
No
No
Resolder or replace U505
9-5
Flow Chart of Troubleshooting
V_EXT_CHARGE
AUX_ON signal