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Flow Chart of Troubleshooting
7-3. Charging Part
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Abnormal charging part
Yes
Check the U503 pin 1
> 4.9V
Yes
U503 pin 5 = "L"?
Yes
U503 pin 3 = "L"?
Yes
Check the U503 pin 10
≒ 4.2V
Yes
END
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Check the circuit related to
No
No
Resolder or replace U503
Check the circuit related to
No
No
Resolder or replace U503
7-6
V_EXT_CHARGE
AUX_ON signal
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