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5-3
SGH-Q200 Flow Chart of Troubleshooting and Circuit Diagrams
5-3. Sim Part
Phone can’t access SIM card
Y
N
Y
Check the pin 1 of CN801.
voltage
≥
2.8 V ?
Check the circuit related to U802
N
Y
Check the SIM
connector’s (CN801)
Connection to
SIM card
Resolder or change CN801
N
Check the related circuit of U802
N
Check the related circuit of U601
and U101
END
Y
Check the circuit around U802
input circuitry
Y
Check the circuit around U601
output and vlotage supply circuitry