LG CU920 Manual page 97

4.7.3 Checking Rx Level
TP3
TP5
TP1
SW100
G2
ANT RF
G1
KMS-512
R125
2.2K
VREG_W
TP6
TP2
WCDMA
U103
WCDMA_850
ANT TX
RX
GND1 GND6
GND2 GND5
GND3 GND4
B7637
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Only for training and service purposes
TP8
TP7
TP6
Fig. 4.7.3.1 Test point of the WCDMA RX Block
TP7
FL104
C929
2 3
100p
G1 O1
1
IN
G2 O2
C169
100p
5 4
L905
6.8nH
L139
22nH
C173 C174
82p 0.1u
L142
C176
82p
2.7nH
R126
2.2K
C180
L144
2.7p
1nH
TP8
TP3
C144
33p
L128
C148
15nH
39p
RX_WCDMA_850
C150
NA
Fig. 4.7.3.2 Schematic of the WCDMA RX Block
4. TROUBLE SHOOTING
L136
1.2nH
C170 L138
4p 15nH
C172 L140
4p 15nH
L141 1.2nH
FL105
L907 1.2nH
C177 L143
2 3
1.5p 68nH
1 G1 O1
IN
G2 O2
5 4
L145
C179
68nH
1.5p
L906 1.2nH
WCDMA_1900
ACMD-7402-TR1G
C930
L904
100p
3.3nH
L903
4.7nH
TP5
- 99 -
TP1
TP2
14
RX_WCDMA_850 LB_LNA_IN
10
LB_LNA_OUT
5
LB_INP
4
LB_INM
15
RX_WCDMA_1900 HB_LNA_IN
9
HB_LNA_OUT
7
HB_INP
6
HB_INM
32
GPS_PLNA_IN
35
GPS_PLNA_OUT
37
GPS_INP
38
GPS_INM
TP4
FL102
U104
CP0402A1880EL
RX TX
C153
68p
RX_WCDMA_1900
R124
51
LGE Internal Use Only
TP4