LG GX500 Service Manual page 107

4. TROUBLE SHOOTING
GX500 Operational Description
Checking Flow
Check TP3, TP4 of FL401/FL1 ?
Figure 4-59 Mobile SW (R403)
LGE Internal Use Only
LG Electronics
Check TP1 of SW600
with RF Cable and TP2 of
C418/C616
TP1 Signal same
as TP2?
Yes
Yes
Control Signal is
OK ?
Yes
TP5 Signal is OK ?
Yes
Mobile SW & FEM is OK.
Check Antenna.
No
Replace Mobile SW
(SW401/SW602)
Replace BB CHIP
No
No
Replace FEM (FL401/FL1)
EGSM TX
Figure 4-60 FEM Control Signals
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