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LGE Internal Use Only
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Only for training and service purposes
4. TROUBLE SHOOTING
LG Electronics
94/147
LGE Property
Check TP1 of SW501
with RF Cable and TP2 of C542
TP1 Signal same
as TP2?
Replace Mobile SW (SW501)
Yes
No
Yes
Mobile SW & FEM is OK.
Check Antenna.
Replace U100
Control Signal is
OK ?
No
Yes
Check TP3, TP4 of FL500 ?
Replace FEM (FL500)
TP5~8 Signal is
OK ?
No
Yes
Checking Flow
Figure 10 Mobile SW (R403)
Figure 11 FEM Control Signals
DCS/PCS RX
FE1
FE2