LG KF350 Service Manual page 91

4. TROUBLE SHOOTING
with RF Cable and TP2 of C406
Figure 10 Mobile SW
LGE Internal Use Only
Check TP1 of SW400
TP1 Signal same
as TP2?
Yes
Check TP3, TP4 of FL400 ?
Yes
Control Signal is
OK ?
Yes
TP5~8 Signal is
OK ?
Yes
Mobile SW & FEM is OK.
Check Antenna.
No
Replace Mobile SW
(SW400)
Replace U102
No
Replace FEM (U401)
No
EGSM RX
Figure 11 FEM Control Signals
Copyright © 2008 LG Electronics. Inc. All right reserved.
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FE1
FE2
Only for training and service purposes