Flow Chart of Troubleshooting and Circuit Diagrams
5-7
5-4 Sim Part
Q102 pin5 = "H" ?
Replace Q102 or
Replace PBA
END
Yes
No
Check the circuit around U113
(Serial EEPROM) and data stored in it
Yes
Phone can't access SIM card
Yes
Q102 pin 2, 3 = 3.0 V ?
Replace Q102 or
Resolder C132
Yes
No
After Power ON,
Check SIMCLK Signal on CN102 pin 3
in a few second
After SIM card insert,
CN102 pin 2 = "H(SIMRST) ?
Resoldering C193 or
Replace PBA
Resoldering C192 or
Replace PBA
Yes
No
No
Q102 pin4 = 3.0 V ?
Yes
No
Check the circuit around U103