LG 42LN549D (CHASSIS:LB3AX) Service Manual ▷ View online
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
5pF
50V
OPT
50V
OPT
C1017
0
R1003
NON_BR
100pF
50V
50V
C1009
4.7K
TU_BUFFER
R1027
0 . 1 u F
16V
NON_ASIA
C1004
FE_TS_DATA[0-7]
TDSN_B001F
SI2176_BR_2INPUT_H
TU1001
1
RF_S/W_CTL
2
RESET
3
SCL
4
SDA
5
+ B 1 [ 3 . 3 V ]
6
S I F
7
+ B 2 [ 1 . 8 V ]
8
CVBS
9
NC_1
10
NC_2
11
NC_3
12
+ B 3 [ 3 . 3 V ]
13
+ B 4 [ 1 . 2 3 V ]
14
NC_4
15
GND
16
ERROR
17
SYNC
18
VALID
19
MCLK
20
D0
21
D1
22
D2
23
D3
24
D4
25
D5
26
D6
27
D7
28
SHIELD
A1
A1
B1
B1
0
R1002
NON_BR
10K
FULL_NIM_BCD
R1013
FULL_NIM
L1002
+5V_Normal
10K
FULL_NIM_OPT
R1005
100pF
50V
50V
C1003
MLB-201209-0120P-N2
L1003
0
NON_ASIA R1024
1K
R1022
1K
R1019
1/16W
1
5%
R1009
0
NON_ASIA R1023
AZ1117BH-1.8TRE1
IC1001
1
ADJ/GND
2
OUT
3
IN
82
R1032
0 . 1 u F
16V
FULL_NIM
C1018
0 . 1 u F
16V
FULL_NIM
C1002
470
TU_BUFFER
R1030
100
R1008
IF_N_MSTAR
1005
20K
FULL_NIM_BCD
R1011
220
TU_BUFFER
R1029
0
ASIA
R1017
100K
R1010
0 . 1 u F
16V
16V
C1001
MMBT3906(NXP)
TU_BUFFER
Q1002
E
B
C
10uF
10V
10V
C1015
+3.3V_TU
TU_SCL
+1.2V/+1.8V_TU
0 . 1 u F
16V
C1011
0 . 1 u F
16V
C1012
NON_BR
FE_TS_VAL_ERR
33
R1014
22uF
10V
10V
C1024
10K
FULL_NIM
R1004
10uF
6.3V
6.3V
C1008
TU_SIF
0 . 1 u F
16V
C1025
220
TU_BUFFER
R1031
+3.3V_TU
18pF
50V
50V
C1019
TDSS-H101F
SI2176_ATSC_1INPUT_H
TU1002-*1
5
+ B 1 [ 3 . 3 V ]
11
DIF[N]
2
RESET
10
D I F [ P ]
4
SDA
1
NC
9
IF_AGC
8
CVBS
3
SCL
7
+ B 2 [ 1 . 8 V ]
6
S I F
12
SHIELD
A1
A1
B1
B1
0
TU_NON_BUFFER
R1026
1K
OPT
R1028
0
TU_NON_BUFFER
R1025
10uF
10V
10V
FULL_NIM
C1021
+3.3V_TU
+3.3V_TU
0
ASIA
R1021
RF_SWITCH_CTL
+1.2V/+1.8V_TU
5pF
50V
50V
OPT
C1020
+3.3V_TU
0 . 1 u F
16V
C1007
FE_TS_CLK
MMBT3906(NXP)
TU_BUFFER
Q1001
E
B
C
0 . 1 u F
16V
C1010
+1.23V_TU
120
FULL_NIM_SS
L1001
100
R1007
NON_BR
11K
FULL_NIM_BCD
R1012
18pF
50V
50V
C1016
+3.3V_Normal
THERMAL
AP2132MP-2.5TRG1
FULL_NIM_BCD
IC1002
3
VIN
2
EN
4
VCTRL
1
PG
5
NC
6
VOUT
7
ADJ
8
GND
9
[ E P ]
IF_P_MSTAR
0 . 1 u F
16V
16V
C1005
+3.3V_TU
TUNER_RESET
0 . 1 u F
16V
C1013
22uF
10V
10V
C1026
0
FULL_NIM_BCD
R1006
2K
ASIA
R1018
0 . 1 u F
16V
C1027
FE_TS_SYNC
+1.23V_TU
22uF
25V
25V
C1006
0
ASIA
C1004-*1
+3.3V_TU
TU_CVBS
TU_SDA
33
R1015
0 . 1 u F
16V
C1014
IF_AGC_MAIN
TDSS-G201D(B)
SI2156_DVB_1INPUT_H (B)
TU1002-*3
5
+3.3V
11
DLIF[N]
2
RESET
10
DLIF[P]
4
SDA
1
NC
9
IF_AGC
8
ALIF[P]
3
SCL
7
+1.8V
6
ALIF[N]
12
SHIELD
A1
A1
B1
B1
TDSS-H101F(B)
SI2176_ATSC_1INPUT_H (B)
TU1002-*2
5
+ B 1 [ 3 . 3 V ]
11
DIF[N]
2
RESET
10
D I F [ P ]
4
SDA
1
NC_1
9
IF_AGC
8
CVBS
3
SCL
7
+ B 2 [ 1 . 8 ]
6
S I F
12
SHIELD
A1
A1
B1
B1
MLB-201209-0120P-N2
L1001-*1
FULL_NIM_MAG
TDSN-B001F(B)
TU1001-*1
BUSING_SI2176_BR_2INPUT_H
1
RF_S/W_CTL
2
RESET
3
SCL
4
SDA
5
+ B 1 [ 3 . 3 V ]
6
S I F
7
+ B 2 [ 3 . 3 V ]
8
CVBS
9
NC_1
10
NC_2
11
NC_3
12
+ B 3 [ 3 . 3 V ]
13
+ B 4 [ 1 . 2 3 V ]
14
NC_4
15
GND
16
ERROR
17
SYNC
18
VALID
19
MCLK
20
D0
21
D1
22
D2
23
D3
24
D4
25
D5
26
D6
27
D7
28
SHIELD
A1
A1
B1
B1
TDSN-B001F(C)
TU1001-*2
Inner_SI2176_BR_2INPUT_H
1
RF_S/W_CTL
2
RESET
3
SCL
4
SDA
5
+ B 1 [ 3 . 3 V ]
6
S I F
7
+ B 2 [ 1 . 8 V ]
8
CVBS
9
NC_1
10
NC_2
11
NC_3
12
+ B 3 [ 3 . 3 V ]
13
+ B 4 [ 1 . 2 3 V ]
14
NC_4
15
GND
16
ERROR
17
SYNC
18
VALID
19
MCLK
20
D0
21
D1
22
D2
23
D3
24
D4
25
D5
26
D6
27
D7
28
SHIELD
A1
A1
B1
B1
510
ASIA
R1020
510
ASIA
R1016
TDSS-G102D
SI2176_DVB_1INPUT_H
TU1002
5
+ B 1 [ 3 . 3 V ]
11
DIF[N]
2
RESET
10
D I F [ P ]
4
SDA
1
NC
9
IF_AGC
8
CVBVS
3
SCL
7
+ B 2 [ 1 . 8 V ]
6
S I F
12
SHIELD
A1
A1
B1
B1
TDSN-T701F(B)
SI2178_TW_LNA_2INPUT_H
TU1003
1
RF_S/WCTL
2
RESET
3
SCL
4
SDA
5
B 1 [ + 3 . 3 V ]
6
S I F
7
B 2 [ 1 . 8 V ]
8
CVBS
9
IF_AGC
10
D I F [ P ]
11
DIF[N]
12
NC_1
13
NC_2
14
NC_3
15
GND
16
NC_4
17
NC_5
18
NC_6
19
NC_7
20
NC_8
21
NC_9
22
NC_10
23
NC_11
24
NC_12
25
NC_13
26
NC_14
27
NC_15
59
SHIELD
LNA_CTRL_1
57
LNA_CTRL_2
58
A1
A1
B1
B1
1K
RF_SW_OPT
R1001
10K
RF_SW_OPT
R1040
2.2K
TW_FE_LNA
R1041
LNA_CTRL_1
2.2K
TW_FE_LNA
R1042
LNA_CTRL_2
0 . 1 u F
16V
TW_FE_LNA
C1030
0 . 1 u F
16V
TW_FE_LNA
C1031
FE_TS_DATA[0]
FE_TS_DATA[1]
FE_TS_DATA[2]
FE_TS_DATA[3]
FE_TS_DATA[4]
FE_TS_DATA[5]
FE_TS_DATA[6]
FE_TS_DATA[7]
GP4R_GLOBAL_TUNER_BLOCK
TUNER
10
LA2AW
2 0 1 2 . 0 9 . 1 1
C l o s e t o t h e t u n e r
BCD Vo=0.6*(1+R1/R2)
c l o s e t o t h e t u n e r p i n , a d d , 0 9 0 2 9
close to TUNER
T J V o = 0 . 8 * ( 1 + R 1 / R 2 )
s h o u l d b e g u a r d e d b y g r o u n d
R1
380mA
1 . s h o u l d b e g u a r d e d b y g r o u n d
2 . N o v i a o n b o t h o f t h e m
3 . S i g n a l W i d t h > = 1 2 m i l s
S i g n a l t o S i g n a l W i d t h = 1 2 m i l s
G r o u n d W i d t h > = 2 4 m i l s
a d d , 0 9 2 9
S i z e c h a n g e , 0 9 2 9
R2
60mA
P u l l - u p c a n ’ t b e a p p l i e d
because of MODEL_OPT_2
0
0
LPF
450Hz~870MHz
0
Through
Frequence
TW_FE_LNA FILTER_SETTING
F i l t e r _ T y p e
54MHz~350MHz
1
HPF
CTRL_2
CTRL_1
350Hz~450MHz
1
0
close to TUNER