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 KS10 is :
VREG_USIM_2.85V(C739 of PM6650) go to 2.85V
→
USIM clock, reset and data triggered
→
USIM IF work (Schematic and place are refer to SIM technical brief)
Start
Work well?
VREG_USIM_2.85V is 3.0V?
USIM_P_CLK is run?
Change the Main board
End
Check J300, C739,
VA300,VA301,
VA302,VA303
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well?
End
Yes
No
VA303 (VREG_USIM_2.85V)
VA302(USIM_P_RST_N)
C739 (VREG_USIM_2.85V)
J300
VA301 (USIM_P_CLK)
VA300 (USIM_P_DATA)
Содержание KS10
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