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Flow Chart of Troubleshooting
9-
8
9-4. Sim Part
SIM400 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 clock
After Power ON,
Check SIM_CLK Signal on pin3
of SIM400 in a few second
Yes
No
Replace PBA
After SIM card insert,
SIM400 pin 2 = "H(SIM_RST)"?
Yes
Содержание SGH-E780
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