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5-4 Sim Part
Phone can't access SIM card
U300 pin4,6 = 3V ?
U300 pin2,3 = 3V ?
CN310 pin1,7 = 3V ?
Check SIMCLK Signal on CN310 pin 1
After SIM card insert,
CN310 pin 2 = "H"(SIMRST) ?
Check the circuit around U520
(Serial EEPROM) and data stored in it
5-7
Yes
Yes
U300 pin5 = "H" ?
Yes
Yes
Yes
After Power ON,
in a few second
Yes
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
Flow chart of trouble shooting
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