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