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SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
4-
3
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4. Charging Part
Check U100
NO
Check the U601
NO
Check the Q101
NO
YES
YES
YES
Abnormal charging part
END
YES
Check the pin 17,18 of
CN302 VEXT is > 4V?
Check the pin 2 of U103
is "LOW"?
Check the pin 3 of Q101
is "LOW"?
Check the pin 5 of U102
is "3.2~4.2"?
Check if ICHRG is 1V
(during charging) and
around 180mV(full
charging)
YES
Check the U102
NO
Resolder or change R111
NO