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Flow Chart of Troubleshooting
7-
8
7-4. Sim Part
CN300 pin 1,5 = "H"?
Phone can't access SIM Card
Check the sim charge pump
Check the SIM Card
END
No
Yes
Yes
Yes
No
Check the 32k OSC
After Power ON,
Check SIMCLK Signal on
CN300 pin3 in a few second
Yes
No
Replace PBA
After SIM card insert,
CN300 pin 2 = "H(SIM_RST)"?
Yes