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Flow Chart of Troubleshooting
7-
6
7-3. Charging Part
Check the U303 pin 1
> 4.9V
Abnormal charging part
END
No
Yes
U303 pin 7 = "H"?
No
Yes
Check the U303 pin8
≒ 4.2V
No
Yes
Check the the circuit related to
+DCVOLT
Resolder or replace U303
Check the circuit related to
CHG_ON signal
Yes
U303 pin 4 = "L"?
Yes
No
Resolder or replace U303