Sim Part - Samsung SGH-S720i Service Manual

Flow Chart of Troubleshooting and Circuit Diagrams

3-1-3. Sim Part

"Insert SIM" is displayed on the LCD
Check the SIM connector's
(CON300)connection to SIM card?
Check the voltage at Pin
#4 of CON300 >=2.8V
IS there any signals Pin
#5,#6,#8
Check the SIM Card
YES
YES
YES
YES
END
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NO
Resolder or change CON300
NO
Check the UCP 300
NO
3-8
or connect again
Check the UCP 300