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5-3
SGH-Q105 Flow Chart of Troubleshooting and Circuit Diagram
5-3. Sim Part
Phone can’t access SIM card
Y
N
Y
Check the pin 1 of CN801.
voltage
≥
2.8V ?
Check the circuit related to U802
N
Y
Check the SIM
connector’s (CN801)
Connection to
SIM card
Resolder or change CN801
N
Check U801 soldered status and the
related circuit of U101
N
Check the soldered status of
components R810, R812, R813, R814
END
Y
Check the voltageof pin4 of U802
≥
2.8 V?
Y
Is there any data to the pin6 of
CN801?