Flow Chart of Troubleshooting
10-1-3. Sim Part
"Insert SIM is displayed on the LCD
Yes
Check the SIM
connector's (SIM103) connection to SIM card
Yes
Check the voltage at pin#1 of SIM103 >= 2.8V ?
Yes
Is there any signals pin#2,#3,#4 of SIM103 ?
Yes
Check the SIM Card
END
No
No
No
Resolder or change SIM103
Check the U107
Check the U107
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②
③
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