Samsung SGH-T429 Service Manual page 39

9-4. Sim Part
Phone can't access SIM Card
SIM300 pin 1,5 = "H"?
After Power ON,
Check SIMCLK Signal on
pin3 of SIM300 in a few second
After SIM card insert,
SIM300 pin 2 = "H(SIM_RST)"?
Check the SIM Card
Yes
Yes
Yes
Yes
Yes
END
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No
Resolder or replace U303
No
No
9-7
Flow Chart of Troubleshooting
Check the Clock
Replace PBA