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Only for training and service purposes
4. TROUBLE SHOOTING
4.4 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
USIM Troubleshooting
Re-insert the SIM card
Work well ?
No
END
END
Yes
Work well ?
Change the Main board
START
Change the SIM card
Yes
No
TP1(Vreg_USIM) is 1.8V or 3.0V ?
TP2(USIM_CLK) & TP3(RST) is run ?
Yes
Check J301
No
No
Work well ?
Yes