LG GS290 Service Manual page 99

4. TROUBLE SHOOTING
GS290 Operational Description
Checking Flow
with RF Cable and TP2 of C524
Check TP3, TP4 of FL500 ?
Mobile SW & FEM is OK.
Figure 30 Mobile SW (R403)
LGE Internal Use Only
LG Electronics
Check TP1 of SW500
TP1 Signal same
as TP2?
Yes
Yes
Control Signal is
OK ?
Yes
TP5 Signal is OK ?
Yes
Check Antenna.
100/136
No
Replace Mobile SW (SW500)
No
Replace BB CHIP (U100)
No
Replace FEM (FL500)
EGSM TX
Figure 31 FEM Control Signals
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Revision B
TP3(VC2)
TP4(VC1)
Only for training and service purposes
LGE Property