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5-4 Sim Part
Phone can't access SIM card
Q402 pin4 = 3.0 V ?
Q402 pin 2, 3 = 3.0 V ?
Check SIMCLK Signal on J402 pin 3
After SIM card insert,
J402 pin 2 = "H(SIMRST) ?
Check the circuit around U617
(Serial EEPROM) and data stored in it
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
Yes
Q402 pin5 = "H" ?
Yes
Yes
After Power ON,
in a few second
Yes
Yes
END
No
Check the circuit around U620
No
Replace Q402 or
Replace PBA
No
Replace Q402 or
Resolder C434
No
Resoldering C718 or
Replace PBA
No
Resoldering C764 or
Replace PBA
5-7
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