4.7 SIM detect trouble
USB Initial sequence of KE990 is :
VREG_SIM_3.0V(C552 of PM6635) go to 3.0V
→
SIM clock, reset and data triggered
→
SIM
IF work (Schematic and place are refer to SIM technical brief)
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 99 -
Start
Work well?
VREG_SIM_3.0V is 3.0V?
SIM_P_CLK is run?
Change th e Main bo ard
End
Check J40 0, D400,C552
Yes
No
YES
NO
Re-inser t the SIM car d
Change SIM car d
Work well?
End
Yes
No
SIM_P_RST_N
C552(VREG_SIM_3.0V)
J400
SIM_P_CLK
SIM_P_DATA
Содержание KE990 - Viewty Cell Phone 100 MB
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