LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 102 -
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 BB CHIP (U102)
Control Signal is
OK
?
No
Yes
Check TP3, TP4 of FL401
?
Replace FEM (FL400)
TP5 Signal is
OK ?
No
Yes
EGSM TX
TP1(ANT SW1)
TP2(ANT SW2)
Checking Flow
Figure 30 Mobile SW
Figure 31 FEM Control Signals