Only For Training And Service Purposes - LG GU280 Service Manual

ANTENNA_PAD
ANT102 ANT101
ANTENNA_PAD
C163 C175
0
R110
1n
C104 C105
1p 10n
VREG_MSMP_2.6V
C149 DNI
WCDMA_1900
WCDMA_1900
WLNA_HB1_IN_M
WLNA_HB1_IN_P
L120 4.7p
WCDMA_2100
L119
DNI
WCDMA_2100
WLNA_HB2_IN_M
TP2
WLNA_HB2_IN_P
R111 6.8n
1
WCDMA_LB
WCDMA_850/900
WLNA_LB_IN_M
WLNA_LB_IN_P
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

WCDMA Rx Path Circuit Diagram
TP1
FL105
RF-800
SW101
C110 33p
15p
2
G2
ANT RF ANT
G1
L101
1
GND1
100n
8
GND2 GSM850_RX_EGSM_RX2
10
GND3 GSM850_RX_EGSM_RX1
12
GND4
13
GND5
23
GND6
24
GND7
GSM850_EGSM_TX
L106
15n
C122
33p
ANT_SEL[0]
ANT_SEL[1]
ANT_SEL[2]
ANT_SEL[3]
L116 DNI FL101 B7686
6 3
ANT TX_IN
1
1
RX_OUT1
C127 8
RX_OUT2
DNI 4
GND1
2 5 2
GND2 GND4
9 7
GND3 GND5
1880,1960MHz
0
2
1
PCS_IN_M
C126
C134 2.2p DNI C133
1 L121
L118
DNI 10n
2
C138 2.2p DNI C129
0
2
1 PCS_IN_P
C123
B7696
FL106
C144 3.3n
6 3
1
ANT TX_IN
2
1
RX_OUT1
8
RX_OUT2
2
GND1
4 7
GND2 GND4
5 9
GND3 GND5
1950 MHz,2140 MHz
C116 1.8n
1
2
1
1
L115 L117
1p DNI
2 2
C142 1.8n
1
2
FL103 B7671
C148 8.2p
6 3
ANT TX_IN
2
1
C160 RX_OUT1
8
12n RX_OUT2
2
GND1
4 7
GND2 GND4
5 9
GND3 GND5
836.5 MHz,881.5 MHz
L108 33p
1
L107 C124
10n
0.5p
2
L109 33p
85090019002100
17
PCN_RX2
16
PCN_RX1
19
PCS_RX2
18
PCS_RX1
15
14
21
WCDMA_1900
WCDMA_850
22
WCDMA_2100
WCDMA_1900
20
WCDMA_2100 WCDMA_LB
11
9
PCN_PCS_TX
C161
9.1n
C112 6p
L103 9p
C102 1.5n
L102 27p
C111
DNI
+VPWR
2
1
C173
C151
DNI
2.2u
2 1
C128 1n
1
2
1 1
C135 C159
DNI DNI
1
C143
2 2
33p
2
TP3
L123 DNI
1 1
C132 C180
DNI DNI
2 2
R109
PWR_DET
1
68
- 51 -
4. TROUBLE SHOOTING
C114 2.7n
1
GLNA_HB_IN_P
2
2
L112
L113
DNI
DNI
1
C113 2.7n
1
GLNA_HB_IN_M
2
C174 1n
2
PCS_IN_M
1
C157 1n
1
PCS_IN_P
2
L105 33p
GLNA_LB_IN_P
C162
C115
0.5p
15n
L104 8.2n
1
GLNA_LB_IN_M
2
C153
1
1n
C1
GSM_PA_BAND MODE
LOW GSM
HIGH DCS/PCS
2
BAND_SELECT
9
GSM_OUT
1
DCS_PCS_IN
11
DCS_PCS_OUT
8
GSM_IN
U101
7 3
TQM7M5012H
GND1 TX_EN
12
GND2
4
VBATT
6
NC1
R
10 5
NC2 VRAMP
2
C152 C121
39p 22n
2 2
2
C147 C130
C158
330p 2.2u
330p
1 1
1
ACPM-5201 U102
11
PGND
10 1
VCC2 VCC1
9 2
RFOUT RFIN
R103
8 3
1
2 ISO VBP
49.9 7 4
GND VMODE
PA_R0
6 5
CPL VEN 2 2
C140 C155
1n 1n
1 1
WCDMA_PA_ON0
2
C139
1n
1
+VPWR
2
C146
680p
1
VCC2 VCC1
6 5
RFOUT RFIN
7 4
ISO VBP
8 3
GND VMODE
9 2
CPL VEN
10 1
PGND
11
ACPM-5305 U104
WCDMA_PA_ON1
2
C136
DNI
2
1
LGE Internal Use Only