Checking Fem Block - LG -V909DW Service Manual

4.3.3 Checking FEM Block

This block is to check RF path by verification RF path switching part.
+2.85V_VDD_RF_SW
C230
1u
C220 C221
DNI DNI
4.7kohm
LGE Internal Use Only
C239
DNI
FIG 8 FEM Block
TP1 R206 1K
ANT_SEL0
R207 1K
TP2
ANT_SEL1
R208 1K
TP3 ANT_SEL2
R209 1K
TP4
ANT_SEL3
L203
15n
C231
33p
SW200
R129
L202
4.7K
100n
+2.85V_MDM_SDCC1
FIG 9 Schematic of the FEM(Front End Module)
R128
120K
C900
39p
12
VC4
13 5
VDD GSM850RX1
14 4
GND1 GND2
15 3
ANT GSM1800/1900RX2
16 2
GND3 GSM1800/1900RX1
17 1
UMTS1 UMTS3
- 66 - Copyright © 2011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
TRX_W2100
TRX_AWS
TRX_W900
Only for training and service purposes
C232 56p
L205
7.5n
C233 56p
C242 8p
L210
1.8n
C243 8p