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