Circuit Diagram - LG U370 Service Manual

7. CIRCUIT DIAGRAM

1 2 3
ANT101 ANT102
MM8430-2600RB3
C100
L100
A 56p
ANT103
3.3nH SW100
1.2p
L101
C101 NA
L102
100nH
U100
19
VREG_RF_SMPS
VDD GSM900_RX1
GSM900_RX2
C111 GSM1800_RX1
B 47p GSM1800_RX2
7
GND1 GSM1900_RX1
8
GND2 GSM1900_RX2
10
GND3 WCDMA2100
12
GND4
13
GND5 CTRL1
15
ANT_SEL0 GND6 CTRL2
17
ANT_SEL1 GND7 D5011
20
GND8
21
GND9 GSM900_TX
23
GND10 GSM18001900_TX
C122 C123
NA 15p
C
D
E
GSM/EDGE
WCDMA
F
2.7nH
L114
FL102
4 1
PGND RX
3 2 C162
ANT TX
3.3p
ACMD-7602
L118
NA
20dB
C
U103
CP0402A1950DNTR
R120
R121
130
7dB
D
E
F
1 2
LG(42)-A-5505-10:01
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4 5
ANT_SEL0 ANT_SEL1
GSM 1800/GSM 1900 RX LOW LOW
GSM 850/ GSM 900 RX HIGH LOW
GSM 850/GSM 900 TX/ WCDMA LOW HIGH
GSM 1800/GSM 1900 TX HIGH HIGH
C104
5
C107
6 DCS
3.9nH
1
2
C112 33p
3
4
9
C115
18
22
PCS C119
16 2.7nH
14
C120 68p
L104
C125
EGSM
2p
+VPWR
C127 C126
33u L107
0.01u
L110
L109
NA 10nH
C130 C131 C140
0.01u
33p 33p
L124
C141
NA
C142 0.01u
68p
FL100
15 3
DCS_PCS_OUT DCS_PCS_IN
4 5
O1 G3
11 4 1
EGSM_OUT U102 EGSM_IN IN
G2 G1
19 18 3 2
RSVD_GND ENABLE GSM_PA_EN
SKY77318 C150
21 1
P_GND BS 100p EFCH897MTDB1
GSM_PA_BAND
C154 GSM_PA_BAND
100p
LOW
HIGH
+VPWR +VPWR
C156 C158 C159
4.7u 0.01u 0.01u
WS2512_TR1G U104
10 1
VCC2 VCC1
9 2
GND4 RFIN
8 3
RFOUT GND1
L116
7 4
2.2p GND3 VCONT
C164 6
C165
GND2
3.3nH 11 5
10nH
BGND VREF
TR100
KRX102U
PWR_DET
C167
R122
47
100p
130
DSA321SCE-19.2M
7
8
VREG_TCXO_2.85V
3
4
C169 C170
0.1uF 1000p
C172 100p
TCXO_PM
C174 1000p
RTR6275_TCXO
4 5 6 7
33p
C108 8.2p
DCS_PCS_TX
C109 6p
GSM_TX
C113 10p
68p
TX_ON
TX_AGC_ADJ
DAC_REF
C121
12p
R102 12K (1%)
15nH
R103 680 (1%)
SSBDT_RTR
C124 22p
15nH
13dB
R109
DCS_PCS_TX
120
8.5dB
R113
GSM_TX
51
VREG_MSMP_2.7V
C153 C152 C151
MODE 0.01u 22p 1000p
GSM
DCS/PCS
VDD_RX
C155
33p
C157
100p
FL101
EFCH1950TDF1
4 5
O1 G3 1
L115 C160
IN
G2 G1
5.6nH NA
3 2
C161
2.2p
PA_R0
5 4
1 G2 O2
FL103
IN
EFCH2140TDE1
G1 O1
2 3
L121
10nH
PA_ON
VREG_TCXO_2.85V
C435
1u
L122 C168
1.8nH 10p
TCXO L123
2.7nH
X100
19.2MHz
NC3 NC2
6
NC4 NC1
5
OUTPUT GND
2
100ohm R123
VCC VCONT TRK_LO_ADJ
1
R124 100K
C173
1000p
VCC
5
C175 0.01u 2 4
TCXO_BT
U105 3
GND
TC7SH04FU
8 9
- 139 -
14 15
TX_IP
C103
180p
C105
180p
TX_IM
55 2
ENV_OUT ENV_LNP TX_QP
1
ENV_LNN C110
46
HB_RF_OUT1 180p
44 51
HB_RF_OUT2 TX_IP
50
TX_IN C114
43 53
LB_RF_OUT1 TX_QP 180p
42 52
LB_RF_OUT2 TX_QN TX_QM
24 7
RF_ON TCXO RTR6275_TCXO
56 5 C117 3300p
VCONTROL VTUNE1
18 C118 1000p
VTUNE2
54
DAC_REF VTUNE-Connected directly to GND
12
RX_IP RX_IP
U101
14 13
SBDT RX_IN RX_IM
RTR6275
3 10
R_BIAS1 RX_QP RX_QP
27 11
R_BIAS2 RX_QN RX_QM
40
PWD_DET_IN PWR_DET
31 21
GCELL_INP TEST
30
GCELL_INN
4
VDDA1
32 6
VDDA2
EGSM_INP VREG_RF_SMPS
33 8
EGSM_INN VDDA3
9
VDDA4
38 15
C129
DCS_INP VDDA5
39 16 22u
DCS_INN VDDA6
19
VDDA7
36 20
GPCS_INP VDDA8 C135 C136 C139 C133 C137
37 28
GPCS_INN VDDA9 0.1u 33p 22p 0.1u 0.1u
41
VDDA10
22 45
CAL_INP VDDA11
23 47
CAL_INN VDDA12
48
VDDA13 VREG_SYNTH_2.6V
26 49
WLNA_IN VDDA14
C145 C146 C143
22p 100p 0.1u
VDD_RX
R112 10
VREG_RF_SMPS
L113
1.5nH
C163
1.2nH
L119
0.5p C199
NA
C166
1.2nH
LGMC
LGE Internal Use Only
16
A
B
C
D
E
F
C
D
E
LG Electronics Inc.