4. TROUBLE SHOOTING
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4.16 SIM detect Trouble shooting
The sequence of detecting LGP880 SIM is,
SIM inserted to LGP880 -> 3.0V_USIM goes to 3.0V(SUB FPCB) -> Triggers SIM clock, reset and data.
Block Diagram of USB & UART connection is shown below
12. SIM detect Troubleshooting
The sequence of detecting LGP880 SIM is,
SIM inserted to LGP880
3.0V_USIM goes to 3.0V(SUB FPCB)
Triggers SIM clock, reset and data.
Block Diagram of USB & UART connection is shown below
I_O
RST
CLK
USIM
USIM_CLK
USIM_RESET
USIM_DATA
XMM6260
CC_RST
CC_CLK
CC_IO
Start
Work well?
End
Yes
No
YES
NO
Re-insert the SIM card
Change SUB FPCB
Work well?
End
Yes
No
3.0V_SIM runs?
Change the main
board
Change SIM card
No
End
Work well?
Change Main board
Yes
Change SUB FPCB
Yes
No
START
Work well?
END
Change The main board
Re-insert the SIM card
3.0V_SIM runs?
Change The main
board
Yes
Work well?
END
Change SIM card
Yes
Work well?
END
No
No
Yes