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 trouble
USB Initial sequence of KC910 is :
VREG_USIM_3.0V(C518 of PM6658) 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 i s run?
Change the Main board
End
Check J20 1,C518,TP202
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
TP201(USIM_P_RST_N)
C518(VREG_USIM_3.0V)
J201
TP202(USIM_P_CLK)
TP203
(USIM_P_DATA)