Sim Part - Samsung SGH-I740c Service Manual

10-4. Sim Part

Phone can't access SIM Card
CD501 pin 11,14 = "H"?
Check SIM_CLK Signal on
After SIM card insert,
Check the SIM Card
Yes
Yes
After Power ON,
pin15 at CD501
Yes
CD501 pin 13
= "H(SIM_RST)"?
Yes
Yes
END
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No
No
No
Resolder CD501 or replace PBA
10-14
Flow Chart of Troubleshooting
Check the sim charge pump
Check the SIM Clock