LG KE520 Service Manual page 89

4. TROUBLE SHOOTING
The soldering of SIM
connector is OK?
The all paths connected
to J600(main PCB) are OK?
Check the SIM_RST,
SIM_CL
The SIM Card is OK?
The DBB(U103) is broken.
Change the board.
LGE Internal Use Only
START
Insert SIM
YES
NO
YES
NO
YES POWER ON
NO
, VRSIM
K, SIM_IO
YES
NO
YES
- 90 -
Re-solder the
J600 of the main
PCB.
Re-solder the
R627,R628,C615, C616, C617, C618
(main PCB)
Check connection of the SIM
connector, SIM Card
SIM card is broken.
Change the SIM Card.
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