Usim Detect Troubleshooting - LG GU280 Service Manual

4. TROUBLE SHOOTING

4.10 USIM Detect Troubleshooting

USIM Initial sequence is :
VREG_USIM_2.85V go to 1.8V or 3.0V
Re-insert the SIM card
Work well ?
Vreg_USIM is 1.8V or 3.0V ?
USIM_P_CLK & RST is run ?
Change the SIM card
Work well ?
LGE Internal Use Only
USIM_CLK,USIM_RST,USIM_DATA triggered
Start
Yes
No
YES
No
Yes
End
End
NO
Check J401
Work well?
No
Change the Main board
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USIM IF work
Yes
Only for training and service purposes