LG GS290 Service Manual page 98

GS290 Operational Description
4.13.6 Checking Mobile SW & FEM
Mobile SW & FEM Circuit Diagram
SW500
KMS-518_P
G1
A
C
G2
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TP1
TP2
TP1 TP2
C524
ANT
17
22p
L501
C539
100n
DNI
Figure 8. Mobile SW & FEM Circuit
Checking Points
TP2
SW500
TP1
Figure 9. Mobile SW & FEM
Table 2. FEM TX Control Logic
EGSM/GSM850
VC1 ON
VC2 OFF
C503
47p
FL500
LMSP43NA-782
FL50
DCS/PCS
OFF
ON
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4. TROUBLE SHOOTING
Revision B
R502 100
VC1
R504 100
VC2
TP
C508
47p
TP3
TP3_C508
TP5 ~ 8
TP4_C503
LGE Internal Use Only
LGE Property