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5-4 Sim Part
Phone can't access SIM card
Q304 pin 4 = 3.0 V ?
Q304 pin 5 = "H" ?
Q304 pin 2, 3 = 3.0 V ?
Check SIMCLK Signal on CN302 pin 3
After SIM card insert,
CN302 pin 2 = "H"(SIMRST) ?
Check the circuit around U408
(Serial EEPROM) and data stored in it
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
Yes
Yes
Yes
After Power ON,
in a few second
Yes
Yes
END
No
Resolder R338
No
Replace Q304 or
Replace PBA
No
Replace Q304
No
Replace PBA
No
Replace PBA
5-7
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