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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-
2
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2. Initial
3. Sim Part
Check the signal at the
pin 19 of U102 is
"High" when the phone
is boot on
Initial Failure
Check U102
END
No
Yes
Check the pin 25 of
U100 is "High"
Yes
Check the U701
Check the pin 4 of
OSC801 is around 2.8V
Check the soldered status of
OSC801,R801,U102
Yes
No
Yes
Check LCD connector CN201,
and resolder bridge
Yes
No
Check the pin 1 of
CN100. voltage 3V ?
Phone can't access SIM card
Check the SIM
connector's (CN100)
connection to SIM
card
Check the circuit related to
U102
Resolder or change CN100
Check the circuit around CN100
input
circuitry
END
No
Yes
Yes
Yes
Yes
No
Check the related circuit of
CN100
No
Check the circuit around U601
output
and vlotage supply circuitry
Yes
Check the related circuit of
U601 and U102
No
