Samsung SGH-E100 Service Manual page 27

3. Charging Part
Abnormal charging part
Check the U405 pin 13,14
U406 pin 5 (CHG_ON)
Check the U405 pin 7
Yes
> 4.9V
Yes
U405 pin 11 = "H"?
Yes
= "L"?
Yes
= "H"?
Yes
U405 pin 1,15,16
≒ 4.2V?
END
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SGH-E100 Flow Chart of Troubleshooting
No
Check the the circuit related to
No
Resolder or replace U405
No
Check the circuit related to
No
No
Resolder or replace U405
7-5
V_EXT_CHARGE
CHG_ON signal
Resolder U405