LG CU920 - USB Connection and Functionality Troubleshooting

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4. TROUBLE SHOOTING
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4.13 USIM Detect Troubleshooting
USIM Initial sequence is :
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_UIM_2.85V go to 2.8V → USIM IF work
Start
Work w ell?
VREG_UIM_
2.85V is 2.85V?
USIM_P_CLK
is run?
Chang e the Main bo ard
End
Check J10 0
Yes
No
YES
NO
Re-inser t the SIM card
Change SIM car d
Work w ell? End
Yes
No