User Guide

5-5 Flow chart of trouble shooting and Circuit Diagram
5-3 Charging Part
Abnormal charging part
Replace TACheck the CN502 pin 17,18 5.2V ?
No
Yes
Yes
Check the U639 pin 3 5.2 V ? Resolder C111, L632, C710
Yes
No
U639 pin 4 = "L" ? Resolder R328
Yes
No
Resolder components around
U639
Check the U639 pin 5 4.2V ?
END
Yes
No