Sim Part - Samsung SGH-E720 Service Manual

SGH-E720 Flow Chart of Troubleshooting

2-1-3. Sim Part

"Insert SIM" is displayed on the LCD
The voltage is 2.8V NO
Check the U401
at the pin #1 of CN401?
YES
NO
Is there any signal
Check the U401 & U201
pin #2,3,4 of CN401 ?
YES
Check the SIM Card
END
2-5
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