Charging Part - Samsung SGH-X490 Service Manual

7-3. Charging Part

Abnormal charging part
Check the U300 pin 2
Y e s
> 4.9V
Y e s
U300 pin 4 = " H " ?
Y e s
U300 pin 5 = " L " ?
Y e s
Check the C300
¡ Ö 4.2V
Y e s
END
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No
Check the the circuit related to
No
Resolder or replace U300
No
Check the circuit related to
No
Resolder or replace U300
7- 7
Flow Chart of Troubleshooting
+ D CVOLT
CHG_ O N signal