LG KE590 Service Manual page 83

4. TROUBLE SHOOTING
The all paths connected
to J100(main key) are OK?
Check the SIM_RST,
SIM_CLK, SIM_IO, VRSIM
The SIM Card is OK?
The DBB(U102) is broken.
Change the board.
LGE Internal Use Only
START
Insert SIM
YES
The soldering of SIM
connector is OK?
YES
YES
POWER ON
YES
YES
NO
Re-solder the
J100 of the main key ..
NO
Re-solder the
R116,R113,R110, C120, C121, C122,
C123(main key)
NO
Check connection of the Main, Main
key, Main FPCB
NO
SIM card is broken.
Change the SIM Card.
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 84 -
Only for training and service purposes