4. TROUBLE SHOOTING
- 36 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
50
01
R
03
1
40
01
R
03
1
SW1001
4
3
2
1
ANT
CO MMO N
G3
G4
1.8n
C1094
R1003
47
33p
C1107
C1071
100p
1.8p
C1096
C1095
1.8p
C1033
10u
L1037
10n
R1001
0
DNI
L1043
2.7n
C1106
C1098
22p
2.7n
L1040
2.7n
L1041
C1103
3.3p
L1034
8.2n
C1105
22p
02
01
R
K7
2
22n
L1035
DNI
C1100
FL1007
942.5MH z
4
5
1
3
2
G1 O 1
IN
G2 O 2
DNI
C1101
C1099
2.7p
VBAT
L1039
2.7n
10p
C1097
U1003
9
8
7
6
5
01
4
11
3
21
2
31
1
14
15
16
17
PGN D
RFO U TM
RFO U TH
RFO U TL
C
N
F
E
R
R
S
G
V
1
N
E
V
C
C
V
2
N
E
V
1
H
D
N
G
F
R
L
NI
F
R
2
H
D
N
G
F
R
RFINM
RFINH
RFGNDM1
RFGNDM2
10n
C1104
VREG_RF_2. 7V
L1021
DNI
C1073
6.8n
4.7n
L1018
1950MHz, 2140MHz
FL1005
9
5
8
4
7
2
3
6
1
RX
ANT
TX
GND1
GND4
GND2
GND5
GND3
GND6
21
01
R
00
1
FL1004
1950MH z
5
2
4
1
3
G3
IN
O U T
G1
G2
97
01
C
p0
01
p0
01
87
01
C
p0
01
67
01
C
L1015
8.2n
100p
C1081
L1030
6.8n
15n
L1029
L1016
DNI
U 1002
PGND1
15
IN_BAND_VIII
1
O U T_BAND_VIII
14
VMO DE_0
2
GND3
13
VMO DE_1
3
VCC2_2
12
VCC2_1
4
GND2
11
VEN_BAND_VIII
5
O U T_BAND_I
10
VEN_BAND_I
6
GND1
9
IN_BAND_I
7
CPL_O U T
8
PGND2
16
330p
C1066
1n
C1065
DNI
C1083
L1022
3.3n
1p
C1074
12n
C1072
18p
C1064
C1082
2.2n
5.6n
L1020
897.5 MH z
FL1003
5
3
2
4
1
IN
O U T
G1
G2
G3
77
01
C
p0
01
L1027
1.5n
L1023
8.2n
33p
C1080
L1025
0.5p
L1024
DNI
C1084
2.2n
L1017
DNI
C1068
15p
DNI
C1102
2.2n
L1038
39n
L1033
L1031
1.2n
FL1002
897.5MHz,942.5MHz
7
5
8
4
9
2
3
1
6
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
10u
C1067
DNI
L1042
00
1
11
01
R
R1010
62
C1009
100p
33
R1006
L1014
0.5p
L1011
0.75p
12n
L1010
L1013
33n
U 1000
31
N
01
K
9
K
8
K
7
K
6
K
5
K
4
K
01
J
9J
8J
7J
6J
5J
4J
01
H
9
H
8
H
7
H
6
H
5
H
4
H
01
G
9
G
8
G
7
G
6
G
5
G
4
G
01
F
9
F
8
F
7
F
6
F
5
F
4
F
01
E
9
E
8
E
7
E
6
E
5
E
4
E
01
D
9
D
8
D
7
D
6
D
5
D
4
D
N7
4
N
1
N
21
M
11
M
01
M
M9
4
M
21
K
21
H
21
G
21
F
2
E
2
C
11
B
8
B
7
B
2
B
31
A
1
A
5
M
8
M
8
N
31
M
21
N
N6
N3
M6
L12
G2
L13
F13
K13
F2
A2
B10
A12
B6
G13
B1
A6
D12
A5
E12
H 2
D13
H 1
E13
F1
D2
B12
D1
C12
A11
B13
A3
C13
N2
J13
J12
M2
M1
H 13
L2
L1
N11
N10
K1
K2
N9
J2
J1
A7
A8
G1
A9
N5
E1
B9
A10
B4
B3
M3
B5
C1
A4
M7
RF_O N
TX_IP
TCXO
TX_IN
SBDT
TX_Q P
TX_Q N
LB_RF_O U T1
LB_RF_O U T2
VTU NE1
VTU NE2
HB_R F_O U T1
VTU NE_GPS
HB_R F_O U T2
HB_R F_O U T3
PRX_Q P
PRX_Q N
W PRXLBP
PRX_IP
PRX_IN
W PRXH BP
W PRXH BM
DRX_Q P
DRX_Q N
W DRXLB
DRX_IP
DRX_IN
W DRXH B1
W DRXH B2
NC
GCELL_INP
DAC_IREF
GCELL_INN
VDDA1_1
EGSM_INP
VDDA1_2
EGSM_INN
VDDA1_3
VDDA1_4
DCS_INP
VDDA1_5
DCS_INN
VDDA1_6
GPC S_INP
VDDA2_1
GPC S_INN
VDDA2_2
VDDA2_3
GPS _IN
VDDA2_4
PDET_IN
VDDA2_5
TX_RBIAS
VDDA2_6
W PRXSE1
VDDA2_7
W PRXSE2
VDDA2_8
VDDA2_9
VDDA2_10
VDDA2_11
VDDA2_12
T
U
O_
2
E
S
X
R
P
W
T
U
O_
1
E
S
X
R
P
W
P
NI
_
X
M_
B
W
M
NI
_
X
M_
B
W
M
S
M_
D
D
V
1
D
N
G
2
D
N
G
3
D
N
G
4
D
N
G
5
D
N
G
6
D
N
G
7
D
N
G
8
D
N
G
9
D
N
G
01
D
N
G
11
D
N
G
21
D
N
G
7_
1
A
D
D
V
W PRXLBM
31
D
N
G
41
D
N
G
51
D
N
G
61
D
N
G
8_
1
A
D
D
V
VDDA2_13
82
D
N
G
81
D
N
G
04
D
N
G
54
D
N
G
12
D
N
G
55
D
N
G
16
D
N
G
71
D
N
G
03
D
N
G
91
D
N
G
44
D
N
G
84
D
N
G
95
D
N
G
32
D
N
G
62
D
N
G
23
D
N
G
93
D
N
G
64
D
N
G
25
D
N
G
45
D
N
G
26
D
N
G
42
D
N
G
13
D
N
G
83
D
N
G
34
D
N
G
94
D
N
G
22
D
N
G
06
D
N
G
72
D
N
G
53
D
N
G
14
D
N
G
02
D
N
G
15
D
N
G
75
D
N
G
46
D
N
G
92
D
N
G
43
D
N
G
73
D
N
G
24
D
N
G
05
D
N
G
65
D
N
G
56
D
N
G
52
D
N
G
33
D
N
G
63
D
N
G
74
D
N
G
35
D
N
G
85
D
N
G
36
D
N
G
66
D
N
G
0.1u
C1019
C1054
0.1u
C1020
0.1u
C1021
0.1u 0.1u
C1022
C1046
0.1u 0.1u
C1047
4.7u
C1048
C1045
0.1u
C1044
0.1u
0.1u
C1043
0.1u
C1042
C1039
0.1u
C1041
4.7u
4.7u
C1038
0.1u
C1037
C1035
0.1u
C1036
4.7u
C1040
0.1u
C1055
4.7u
VREG_RF_2.7V_RTR
100p
C1030
12K
R1007
13
01
C
DNI
C1026
100p
L100 8
5.6n
0.1u
C1027
33p
C1006
VREG_RF_2.7V
100p
C1002
C1016
0.1u
C1007
1n
100p
C1003
33p
C1010
C1028
10u
1n
C1015
VSNS_RF_SMPS_2.1V
R1002
0
C1004
10n
C1005
10n
C1029
4.7u
C1017
4.7u
VREG_SMPS_2.1V
150p
C1000
C1001
150p
C1008
150p
150p
C1011
33p
C1032
K1
31
01
R
0
R1014
DNI
R1015
u1.
0
58
01
C
3.9p
C1086
L1026
2n
DNI
C1087
C1093
3.9p
DNI
C1090
1n
C1049
U1001
GND1
2
VBATT
5
01
D
N
G
72
GND2
19
9
D
N
G
62
GND3
20
8
D
N
G
52
GND4
21
ANT
18
PGND3
31
PGND2
30
PGND1
29
GND5
22
6
D
N
G
32
7
D
N
G
42
PGND6
34
PGND5
33
PGND4
32
7
D
N
G
P
53
8
D
N
G
P
63
9
D
N
G
P
73
PGND1 0
38
PGND1 1
39
PGND1 2
40
PGND1 3
41
PGND1 4
42
PGND1 5
43
PGND1 6
44
HB_IN
1
11
D
N
G
82
LB_IN
3
VAPC
4
BS2
6
BS1
7
TXEN_
8
E
D
O
M
9
W CDMA3
17
P
M
E
T
01
4
X
R
11
3
X
R
21
2
X
R
31
1
X
R
41
W CDMA1
15
W CDMA2
16
R1000
2.2K
L1003
82n
L1006
0.5p
L1001
DNI
VBAT
L1004
8.2n
FL1001
1842.5M Hz,1960M H z
10
3
5
2
8
1
9
6
7
4
IN_1842_5
O U T_1842_5_1
O U T_1842_5_2
O U T_1960_1
IN_1960
O U T_1960_2
GND1
GND3
GND2
GND4
C1059
1.2n
C1057
2.2n
C1061
100p
C1063
1.2n
C1053
2.2n
12n
C1023
10n
L1007
100n
L1002
12n
C1025
C1014
3.3p
C1012
3.3p
80
01
R
19
47p
C1034
C1051
1n
VSNS_RF_SMPS_2.1V
L1028
1.2n
33p
C1088
C1052
1n
C1050
1n
90
01
R
19
C1024
39p
2140MHz
FL1006
4
5
1
3
2
G1 O 1
IN
G2 O 2
C1089
3.3n
FL1000
881.5MHz,942.5MHz
10
3
5
2
8
1
9
6
7
4
IN_881_5
O U T_881_5_1
O U T_881_5_2
O U T_942_5_1
IN_942_5
O U T_942_5_2
GND1
GND3
GND2
GND4
DNI
L1000
C1013
100p
3.9n
C1018
L1005
DNI
C1056
2.4n
DNI
L1009
C1058
18p
4.7n
L1012
SW1000
G1
ANT
G2
22p
C1060
C1062
0.1u
L1032
1.2n
GND
TX_O N
ANT_SEL[2]
ANT_SEL[2]
ANT_SEL[1]
GSM_PA _RA MP
PA_R0
PA_R1
TX_Q _M
TX_Q _P
TX_I _M
TX_I _P
RX0 _I_M
RX0 _I_P
RX0 _Q _M
RX0 _Q _P
RX1 _Q _P
RX1 _Q _M
RX1 _I_M
RX1 _I_P
GPS_I N
WCDMA_LB_RTX
WCDMA _LB_RTX
ANT_SEL[3]
GSM_L B_TX
GSM _LB_TX
GSM_HB_TX
GSM _H B_TX
PDET_IN
PDET_IN
PA_O N1
PA_O N0
ANT_SEL[0]
ANT_SEL[0]
VREG_MSME_1.8V
RTR6285_SSBI
DAC_REF
TCX O _RTR_19.2MH Z
WCDMA_HB_RTX
WCDMA _HB_RTX
W CDMA_LB_TX
W CDMA_LB_TX
W CDMA_H B_TX
W CDMA_H B_TX
P
NI
_
XI
M_
B
H_
A
M
D
C
W
WCDMA _HB_MIX_INP
M
NI
_
XI
M_
B
H_
A
M
D
C
W
WCDMA _HB_MIX_INM
GSM900_RX_M
GSM 900_RX_M
GSM900_RX_P
GSM 900_RX_P
PCS_RX_M
PCS_RX _M
PCS_RX_P
PCS_RX _P
WCDMA1900_RX_LNA_OUT
WCD MA1900_RX_LNA_O U T
WCDMA2100_RX_LNA_OUT
WCD MA2100_RX_LNA_O U T
W CDMA_H B_RX
W CDMA_H B_RX
W CDMA_LB_RX_M
W CDMA_LB_RX_M
W CDMA_LB_RX_P
W CDMA_LB_RX_P
GSM850_RX_P
GSM 850_RX_P
GSM850_RX_M
GSM 850_RX_M
DCS_RX_P
DCS_RX_P
DCS_RX_M
DCS_RX_M
VREG_RF_2.7V_RTR
1mm
Near to 4 Pin
Near to 12 Pin
Near to 12 Pin
BAND2(2520): ACMD-7407
BAND1(2520): B7697
BAND8(2520) : SAYRJ 897MCA0B0A
BAND15:
BAND25:
BAND18:SKY77195
0603
W900/ 850
W2100/ 1900
BAND5(2520) : B7671
WCDMA Dual
1%
Nea r To RTR
GSM850(824-849MHz )
GSM900(880-915MHz )
HIGH
HIGH
W1700
LOW
LOW
HIGH
LOW
HIGH
HIGH
HIGH
DCS1800/PCS1900 TX
GSM850/GSM900 TX
PCS1900 RX
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
LOW (X)
W900(W850)
LOW (X)
LOW (X)
LOW (X)
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
LOW
ANTENNA SWITCH MODULE LOGIC(SKY77544)
LOW
ANT_SEL3
DCS1800 RX
GSM900 RX
ANT_SEL2
ANT_SEL1
ANT_SEL0
GSM850 RX
LOW
W2100
0603
FEM
GSM Qu ad
2mm
7.4dB
DCS(1805-1880 MHz)
PCS(1930-1990 MHz)
GSM(925-960 MHz)
GSM( 869-894 MH z)
7dB
PCS(1850-1910 MH z)
DCS(1710-1785 MH z)
0603
0603
0603