LG GD310 Service Manual page 92

Figure 10 Mobile SW
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Only for training and service purposes
Checking Flow
Check TP1 of SW400
with RF Cable and TP2 of C420
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 U101
No
Replace FEM (FL400)
No
EGSM RX
Figure 11 FEM Control Signals
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5. TROUBLE SHOOTING
FE1
FE2
LGE Internal Use Only