LG KU950 - SIM Detect Trouble

4. TROUBLE SHOOTING
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4.10 SIM detect trouble
USB Initial sequence of KU950 is :
VREG_USIM_2.85V(C625 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 J500, C625,
D500
Yes
No
YES
NO
Re-insert the SIM card
Change SIM card
Work well? End
Yes
No
J500
D500
VREG_USIM_2.85V
(C625)
USIM_P_CLK
(D500 Pin 1)
USIM_P_RS
T
(D500 Pin 3)
VREG_USIM_2.85V
(D500 Pin 4)
USIM_P_DATA
(D500 Pin 6)