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Flow Chart of Troubleshooting
7-5
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3. Charging Part
Check the U304 pin 2
> 4.9V
Abnormal charging part
END
No
Yes
U304 pin 6 = "H"?
No
Yes
U304 pin 5 (CHG_ON)
= "L"?
No
Yes
U304 pin 7
≒ 4.2V?
No
Yes
Check the the circuit related to
CHARGER_OK
Resolder or replace U304
Check the circuit related to
CHG_ON signal
Resolder or replace U304
Yes