Sim Detect Troubleshooting - LG L705i Service Manual

4.9 SIM Detect Troubleshooting

USIM Initial sequence of L705i is:
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_USIM_2.85V go to 2.85V → USIM IF work
Re-insert the SIM card
VREG_USIM_2.85V is 2.85V?
Change the Main board
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Only for training and service purposes
Start
Yes
Work well?
No
USIM_P_CLK is run?
YES
Change SIM card
Yes
Work well?
No
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4. TROUBLE SHOOTING
End
NO
Check J300
End
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