Sim Detect Troubleshooting - LG GM750 Service Manual

4. TROUBLE SHOOTING

4.14 SIM Detect Troubleshooting

USIM Initial sequence of GM750 is :
SIM_CLK,SIM_RST,SIM_IO triggered
LGE Internal Use Only
VRUIM_3.0V go to 2.8V
Start
Re-insert the SIM card
Work well?
No
VRUIM_3.0V
is 2.85V? SIM_CLK
is run?
YES
Change SIM card
Work well?
No
Change the Main board
SIM IF work
Yes
End
NO
Check J601
Yes
End
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