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5-4 Sim Part
Phone can't access SIM card
Check SIMCLK Signal on CN301 pin 1
CN301 pin 2 = "H"(SIMRST) ?
Check the circuit around U504
(Serial EEPROM) and data stored in it
Flow chart of trouble shooting
Yes
U300 pin4,6 = 3V ?
Yes
U300 pin5 = "H" ?
Yes
U300 pin2,3 = 3V ?
Yes
CN301 pin3,7 = 3V ?
Yes
After Power ON,
in a few second
Yes
After SIM card insert,
Yes
END
No
Check the circuit related to U102
No
Replace the PBA
No
Replace U300
No
Resoldering CN301 and check open
connection from U300 to CN301
No
Replace the PBA
No
Replace the PBA
5-7
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