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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.14 SIM Detect Troubleshooting
Start
Work well?
VRUIM_3.0V
is 2.85V? SIM_CLK
is run?
Change the Main board
End
Check J601
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
USIM Initial sequence of GM750 is :
SIM_CLK,SIM_RST,SIM_IO triggered
Æ
VRUIM_3.0V go to 2.8V
Æ
SIM IF work