Sim Detect Trouble Shooting - LG -P990 Service Manual

4.15 SIM detect Trouble shooting

The sequence of detecting LGP990 SIM is,
SIM inserted to LGP990
Block Diagram of USB & UART connection is shown below
USIM
START
Re-insert the SIM card
Work well?
No
.85V_SIM(C07)runs?
Yes
Change SUB
Work well?
No
Change SIM card
Work well?
No
Change Main
LGE Internal Use Only
2.85V_SIM(C207) goes to 2.85V
SIM_CLK
CLK
SIM_RST
RST
SIM_IO
I_O
Start
Re-insert the SIM card
Yes
Work well?
No
2.85V_SIM (C207) runs?
No
YES
Change SUB
Work well?
Yes
No
Change SIM card
Work well?
No
Change Main
Yes
Triggers SIM clock, reset and data.
MP-EHM
CC_CLK
CC_RST
XMM6160
CC_IO
Yes
End
END
NO
Change the main
Change the main board
board
Yes
End
END
Yes
End
END
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4. TROUBLE SHOOTING
Only for training and service purposes