LG KE990 Service Manual - Page 98
SIM detect trouble
View all LG KE990 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 98 highlights
4. TROUBLE SHOOTING 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) Start Re-inser t the SIM car d Yes Work well? End No NO VREG_SIM_3.0V is 3.0V? SIM_P_CLK is run? Check J40 0, D400,C552 YES Change SIM car d Yes Work well? End No Change th e Main bo ard SIM_P_RST_N SIM_P_CLK SIM_P_DATA C552(VREG_SIM_3.0V) Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 99 - J400 LGE Internal Use Only
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 the Main board
End
Check J40 0, D
400,C552
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
SIM_P_RST_N
C552(VREG_SIM_3.0V)
J400
SIM_P_CLK
SIM_P_DATA