LG CU920 - Page 97

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Only for training and service purposes
4. TROUBLE SHOOTING
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4.7.3 Checking Rx Level
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
Fig. 4.7.3.1 Test point of the WCDMA RX Block
C179
1.5p
1nH
L144
6.8nH
L905
L138
15nH
C169
100p
100p
C929
C174
0.1u
L145
68nH
1.2nHL141
R126
2.2K
82p
C173
82p
L142
22nH
L139
4p
15nH
C170
L140
SAFEB1G96FL0F00
FL105
G1
2
5
G2
1
IN
3
O1
4
O2
2.7nH
C180
C176
2.7p
GPS_PLNA_IN
GPS_PLNA_OUT
35
HB_INM
6
7
HB_INP
15
HB_LNA_IN
HB_LNA_OUT
9
LB_INM
4
5
LB_INP
LB_LNA_IN
14
LB_LNA_OUT
10
GPS_INM
38
37
GPS_INP
32
3
O1
4
O2
C172
4p
SAFEB881MFM0F00
FL104
2
G1
5
G2
1
IN
L906 1.2nH
C177
1.5p
L136
1.2nH
2.2K
R125
1.2nH
68nH
L143
L907
VREG_W
RX_WCDMA_1900
RX_WCDMA_850
SW100
ANT
G1
G2
RF
KMS-512
Fig. 4.7.3.2 Schematic of the WCDMA RX Block
TP1
TP6
TP2
TP3
TP7
TP8
WCDMA
B7637
ANT
GND1
GND2
GND3 GND4
GND5
GND6
RX
TX
U103
15nH
L128
NA
C150
C144
33p
39p
C148
RX_WCDMA_850
WCDMA_850
L903
4.7nH
3.3nH
L904
51
R124
100p
C930
CP0402A1880EL
U104
COUP
3
IN
2
68p
C153
G6 G7
RX TX
ACMD-7402-TR1G
FL102
ANT
G1 G2 G3 G4 G5
WCDMA_1900
RX_WCDMA_1900
TP5
TP4