- 93 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
5. TROUBLE SHOOTING
Check TP1 of SW400
with RF Cable and TP2 of C420
TP1 Signal same
as TP2?
Replace Mobile SW
(SW400)
Yes
No
Yes
Mobile SW & FEM is OK.
Check Antenna.
Replace U101
Control Signal is
OK
?
No
Yes
Check TP3, TP4 of FL400
?
Replace FEM (FL400)
TP5~8 Signal is
OK ?
No
Yes
Checking Flow
Figure 10 Mobile SW
Figure 11 FEM Control Signals
EGSM RX
FE1
FE2