LG KF350 Service Manual page 101

4. TROUBLE SHOOTING
Checking Flow
Figure 30 Mobile SW
LGE Internal Use Only
Check TP1 of SW400
with RF Cable and TP2 of C406
TP1 Signal same
as TP2?
Yes
Check TP3, TP4 of FL401 ?
Yes
Control Signal is
OK ?
Yes
TP5 Signal is
OK ?
Yes
Mobile SW & FEM is OK.
Check Antenna.
No
Replace Mobile SW
(SW400)
No
Replace BB CHIP (U102)
Replace FEM (FL400)
No
EGSM TX
Figure 31 FEM Control Signals
Copyright © 2008 LG Electronics. Inc. All right reserved.
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TP1(ANT SW1)
TP2(ANT SW2)
Only for training and service purposes