Sim Detect Trouble - LG L602i Service Manual

4.9 SIM Detect Trouble

USB Initial sequence of L602i is :
VREG_USIM_2.85V(C430 of PM6650-2) go to 3.0V -> USIM_CLK,USIM_RST,USIM_DATA
triggered -> USIM IF work(Schematic and place are refer to SIM technical brief)
Start
Re-insert the SIM card
Work well?
No
VREG_USIM_2.85V is 3.0V?
USIM_P_CLK is run?
YES
Change SIM card
Work well?
No
Change the Main board
Yes
End
Check J300,
NO
TP205,TP206,
VREG_USIM_2.85V
Yes
End
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4. TROUBLE SHOOTING
USIM_P_DATA (J300 PIN6)
VREG_USIM_2.85V (J300 PIN 1)
USIM_P_RST (J300 PIN2)
USIM_P_CLK (J300 PIN3)