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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4.8 SIM detect trouble
USB Initial sequence of KU990 is :
VREG_USIM_3.0V(C552 of PM6650) go to 3.0V
→
USIM clock, reset and data triggered
→
USIM IF
work (Schematic and place are refer to SIM technical brief)
Start
Work well?
VREG_USIM_3.0V is 3.0V?
USIM_P_CLK is run?
Change the Main board
End
Check J400, D400,C552
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
USIM_P_RST_N
C552(VREG_USIM_3.0V)
J400
USIM_P_CLK
USIM_P_DATA
Содержание U990
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