Sim Detect Troubleshooting - LG KS20 Operating Instructions Manual

4.13 SIM Detect Troubleshooting

USIM Initial sequence of KS20 is :
SIM_CLK,SIM_RST,SIM_IO triggered → VRUIM_3.0V go to 2.8V → SIM IF work
Re-insert the SIM card
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Only for training and service purposes
Start
Work well?
No
VRUIM_3.0V is 2.85V?
SIM_CLK is run?
YES
Change SIM card
Work well?
No
Change the Sub board
4. TROUBLE SHOOTING
Yes
End
NO
Check CN400
Yes
End
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