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5-4 Sim Part
Phone can't access SIM card
Yes
U106 pin 6 = 3 V ?
Resolder R123
END
Yes
No
Yes
Check the circuit around U401
(Serial EEPROM) and data stored in it
Yes
U106 pin 5 = "H" ?
U106 pin 2, 3 = 3 V ?
Replace the PBA
Replace U106
Yes
No
No
CN102 pin 1, 5 = 3 V ?
Resoldering CN102
and check open connection
from U106 to CN102
No
After Power ON,
Check SIMCLK Signal on CN102 pin 3
in a few second
After SIM card insert,
CN102 pin 2 = "H(SIMRST) ?
Replace PBA
Replace the PBA
Yes
Yes
No
No
5-7
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