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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.9 SIM Detect Troubleshooting
USIM Initial sequence of CU405 is :
USIM_CLK,USIM_RST,USIM_DATA triggered
→
VREG_UIM_2.85V go to 2.8V
→
USIM IF work
Start
Work well?
VREG_UIM_2.85V is 2.85V?
USIM_P_CLK is run?
Change the Main board
End
Check J500
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
VREG_UIM_2.85
USIM_P_CLK
USIM_P_DATA
USIM_P_RST_N
Ground
Summary of Contents for CU405
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model CU405 Service Manual CU405 Internal Use Only ...
Page 175: ...Note ...
Page 176: ...Note ...