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Flow Chart of Troubleshooting
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9-5
9-3. Charging Part
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
U500
pin 10
≒ 4.2V
Yes
No
U500
pin 3 = "L"?
Yes
No
U500
pin 5 = "L"?
Yes
No
END
Abnormal charging part
Check the
U500
pin 1
> 4.9V
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
Yes
No
Yes
No
Yes
No
END
Abnormal charging part