Samsung SGH-S300 Service Manual page 20

4. Charging Part
Abnormal charging part
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)
END
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SGH-S300 Flow Chart of Troubleshooting and Circuit Diagrams
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
SAMSUNG Proprietary-Contents may change without notice
Resolder or change R111
6-3
Check U100
Check the U700
Check the Q101
Check the U102