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3. Sim Part
Phone can't access SIM card
Check the pin 1 of
CN101. voltage 3V ?
connector's (CN101)
connection to SIM
Check the circuit around CN101
Check the circuit around U601
and vlotage supply circuitry
Yes
Yes
Check the SIM
card
Yes
input
circuitry
Yes
output
Yes
END
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SGH-X400 Flow Chart of Troubleshooting
No
Check the circuit related to
U102
No
Resolder or change CN101
Check the related circuit of
No
CN101
No
Check the related circuit of
U601 and U102
4-3
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