LG KD3500 Service Manual page 51

Checking Flow
START
Check if right UIM card is used
Yes
Try after re-download SW
NG
Check CON302 soldering?
OK
Check UIM Card circuit
(R375, R378,R361,R376)
OK
Change main board
- CON302 : KCN-2T-0-0075
- U201 : QSC6010
No
Use right UIM card, and try again
OK
NG
NG
Re-solder or replace them
Done
Re-soldering CON302