Table of Contents
Advertisement
5-4 Sim Part
Phone can't access SIM card
Check SIMCLK Signal on J402 pin 3
J402 pin 2 = "H"(SIMRST) ?
Check the circuit around U304
(Serial EEPROM) and data stored in it
Flow chart of trouble shooting
Yes
Q402 pin4 = 3V ?
Yes
Q402 pin5 = "H" ?
Yes
Q402 pin2,3 = 3V ?
Yes
J402 pin1,7 = 3V ?
Yes
After Power ON,
in a few second
Yes
After SIM card insert,
Yes
END
No
Check the circuit related to U308
No
Replace the PBA
No
Replace Q402
No
Resoldering J402 and check open
connection from Q402 to J402
No
Replace the PBA
No
Replace the PBA
5-4
Advertisement
Table of Contents
