LG KM710 Service Manual page 77

4. Trouble Shooting
Insert SIM
YES
The soldering of SIM
connector is OK?
YES
The all paths connected
to J700(main key) are OK?
YES
Check the SIM_RST,
SIM_CLK, SIM_IO, VRSIM
YES
The SIM Card is OK (plat)?
YES
The DBB(U103) is broken.
Change the board.
LGE Internal Use Only
START
POWER ON
NO
Re-solder the
J700 of the main
key . .
NO
Re-solder the
R710, C702, C703, C703, C704, C705
of the main key
NO
Check connection of the Main, Main
key, Main FPCB
NO
SIM card is broken.
Change the SIM Card.
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Only for training and service purposes