LG GD310 Service Manual page 91

5. TROUBLE SHOOTING
5.12.3 Checking Mobile SW & FEM
TP1
TP1
SW401
G2 ANT
G1
UFL-R-SMT10
TP2
FL400
LGE Internal Use Only
Mobile SW & FEM Circuit Diagram
C416
1n
TP2
TP2
SW400
C420
G2
ANT RF
G1 11
100P
RF-800
L406
C437 100NH
DNI
Figure 8. Mobile SW & FEM Circuit
Checking Points
TP5 ~ 8
TP4_R405 (FE2)
TP3_R400 (FE1)
Figure 9. Mobile SW & FEM
Table 2. FEM RX Control Logic
EGSM/GSM850
FE1 ON
FE2 OFF
2V85_VRF
LMSP43QA-538(CMOS)
NC2
24
NC1
FL400 23
LMSP43QA-538
ANT
TP5~TP8
TP5~TP8
DCS/PCS
OFF
OFF
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TP3
TP3
R400 100R
R405 100R
C413 C412
100P 100P
TP4
TP4
SW400
TP1
Only for training and service purposes
FE1
FE2