Sim Part - Samsung GT-B5310 Service Manual

9-4. Sim Part

"Insert SIM is displayed on the LCD
Check the SIM connector's
(SIM400) connection to SIM card
Check the voltage at pin#1 of
SIM400 >= 3.0V ?
Is there any signals pin#2,#3,#4
Yes
Yes
Yes
of SIM400 ?
END
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No
Resolder or change SIM400
No
No
9-7
Flow Chart of Troubleshooting
Check the U400
Check the U400