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