Sim Detect Troubleshooting - LG U250 Service Manual

4. TROUBLE SHOOTING

4.12 SIM Detect Troubleshooting

USIM Initial sequence of U250/KU250 is :
USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_UIM_2.85V go to 2.8V → USIM IF work
Change the Main board
Start
Re-insert the SIM card
Work well?
No
VREG_UIM_2.85V is 2.85V?
USIM_P_CLK is run?
YES
Change SIM card
Work well?
No
Yes
End
NO
Check J300
Yes
End
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