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5-4 Sim Part
5-7
Phone can't access SIM card
Yes
R699 = 2.9 V ?
Yes
U463 pin1 = 3 V ?
Yes
U101 pin6 = 3 V ?
Yes
U101 pin 5 = "H" ?
Yes
U101 pin 2, 3 = 3 V ?
Yes
CN102 pin 1, 5 = 3 V ?
Yes
After Power ON,
Check SIMCLK Signal on CN102 pin 3
in a few second
Yes
After SIM card insert,
CN102 pin 2 = "H(SIMRST) ?
Yes
Check the circuit around U107
(Serial EEPROM) and data stored in it
END
No
Check the circuit related to U463
No
Check the circuit related to
R421, R428, U649
No
Resolder R103
No
Replace the PBA
No
Replace U101
No
Resoldering CN102
and check open connection
from U101 to CN102
No
Replace PBA
No
Replace the PBA
Flow chart of trouble shooting and Circuit Diagram
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