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4-
4
SGH-X400 Flow Chart of Troubleshooting
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4. Charging Part
Check the pin 17, 18
of CN300 is
TA_VEXT>4?
Abnormal charging part
Check the pin 5 of
Q102 is "High"?
Replace TA,Check CN300
Check the Q102
Check the Q102
END
No
Yes
Yes
Yes
Yes
No
No
Check the pin 3 of
Q102 is "Low"?
Check the pin 5 of
U101 is "3.2~4.2V"?
Check the U101
No
Yes
Check the pin 5
1.5V~1V(during
charging) and around
200mV(full charging)?
No
Check the U101 or Resolder or
change R102
Yes
