LG -V909DW Service Manual page 77

LGE Internal Use Only
yes yes
yes yes
Check TP2, TP3 Check TP2, TP3
Check TP2, TP3 Check TP2, TP3
Signal exist? Signal exist?
Signal exist? Signal exist?
no no
no no
Change the board Change the board
Change the board Change the board
Chart 4 GSM Receiver Block sequence
Chart 4 GSM Receiver Block sequence
FIG 23 GSM Rx Block
FIG 23 GSM Rx Block
SW200
TP1
TP1
R129
L202
4.7K
100n
FIG 24 Schematic of the FEM
yes yes
yes yes
Check FEM Block Check FEM Block
Check FEM Block Check FEM Block
12
VC4
13 5
VDD GSM850RX1
14 4
GND1 GND2
15 3
ANT GSM1800/1900RX2
16 2
GND3 GSM1800/1900RX1
17 1
UMTS1 UMTS3
TP2
TP3
- 77 - Copyright © 2011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
TRX_W2100
TRX_AWS
TRX_W900
Only for training and service purposes