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4. TROUBLE SHOOTING
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START
Work well ?
End
No
End
TP1 is 1.8V or 3.0V ?
TP2 & TP3 is run ?
Check J1100
No
Yes
Work well ?
Yes
Work well?
Yes
Change the Main board
No
Re-insert the SIM card
Change the SIM card
Yes
4.10 USIM Detect Troubleshooting
USIM Initial sequence is :
TP1 go to 1.8V or 3.0V -> TP2,TP3,TP4 triggered -> USIM IF work