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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.11 SIM Detect Troubleshooting
USIM Initial sequence of U370 is :
USIM_CLK,USIM_RST,USIM_DATA triggered
→
VREG_UIM_2.85V go to 2.8V
→
USIM IF work
Start
Re-insert the SIM Card
Work Well ?
NO
YES
END
Change the Main board
Check VREG_USIM_2.85V &
USIM_P_CLK is run
YES
Work well ?
NO
NO
Check J300 ( USIM Connector)
YES
END
Change the SIM card
Summary of Contents for U370
Page 1: ...Date January 2008 Issue 1 0 Service Manual Model U370 Service Manual U370 ...
Page 178: ...Note ...
Page 179: ...Note ...