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.
1K
RGB_PC
R732
100
R711
DSUB_DET
J P 7 0 8
0 . 1 u F
C706
100
R710
68pF
50V
50V
OPT
C718
ADMC 5M 02 200L
5.6V
OPT
VA708
VA708
68pF
50V
50V
OPT
C720
5.6V
OPT
VA707
PM_TXD
MMBD6100
RGB_PC
D710
A2
C
A1
1K
R712
+3.3V_Normal
+3.3V_Normal
J P 7 0 9
+3.5V_ST
0 . 1 u F
C703
0 . 3 3 u F
C701
DSUB_HSYNC
0 . 1 u F
16V
NON_CI_CAP_RGB_PC
C724
DSUB_B+
DSUB_VSYNC
ADUC 20S 02 010L
20V
OPT
VA705
DSUB_G+
PM_RXD
100pF
50V
50V
C709
ADUC 20S 02 010L
20V
RGB_VARISTOR
VA703
0 . 1 u F
C705
18pF
50V
NON_CI_CAP_RGB_PC
C721
0 . 1 u F
C702
ADUC 20S 02 010L
20V
RGB_VARISTOR
VA702
2.2K
RGB_PC
R723
ADUC 20S 02 010L
20V
RGB_VARISTOR
VA704
RGB_DDC_SDA
CDS3C30GTH
30V
30V
OPT
D704
ADUC 20S 02 010L
20V
OPT
VA701
RGB_DDC_SCL
75
RGB_PC
R718
75
RGB_PC
R719
10K
RGB_PC
R729
5.6V
OPT
VA706
75
RGB_PC
R720
2.2K
RGB_PC
R724
0 . 1 u F
16V
16V
C707
BAP70-02
50V
D707
+3.5V_ST
+5V_Normal
EAN41348201
MAX3232CDR
IC701
3
C1-
2
V+
4
C2+
1
C1+
6
V-
5
C2-
7
DOUT2
8
RIN2
9
ROUT2
10
DIN2
11
DIN1
12
ROUT1
13
RIN1
14
DOUT1
15
GND
16
VCC
SPG09-DB-009
JK706
1
2
3
4
5
6
7
8
9
10
0 . 1 u F
C704
IR_OUT
Fiber Optic
JST1223-001
SPDIF-JACK-SOLTEAM
JK702-*1
1
GND
2
VCC
3
VINPUT
4
FIX_POLE
CDS3C30GTH
30V
30V
OPT
D706
DSUB_R+
Fiber Optic
2F01TC1-CLM97-4F
SPDIF-JACK-FOXCONN
JK702
3
VIN
2
VCC
1
GND
4
SHIELD
18pF
50V
NON_CI_CAP_RGB_PC
C723
SPG09-DB-010
RGB_PC
JK705
1
RED
2
GREEN
3
BLUE
4
GND_1
5
DDC_GND
6
RED_GND
7
GREEN_GND
8
BLUE_GND
9
NC
10
SYNC_GND
11
GND_2
12
DDC_DATA
13
H_SYNC
14
V_SYNC
15
DDC_CLOCK
16
SHILED
SPDIF_OUT
JP_GND1
JP_GND2
JP_GND3
JP_GND4
USB1_DM
USB2_DP
+5V_USB_2
+5V_USB_1
USB DOWN STREAM
3AU04S-305-ZC-(LG)
JK703
1
2
3
4
5
RCLAMP0502BA
OPT
D709
USB DOWN STREAM
3AU04S-305-ZC-(LG)
JK704
1
2
3
4
5
USB1_DP
RCLAMP0502BA
OPT
D708
USB2_DM
CIS21J121
USB2_SS
L703
47
R715
MLB-201209-0120P-N2
120-ohm
USB2_MAG
L703-*1
4.7K
OPT
R713
+5V_Normal
+3.3V_Normal
USB2_OCD
AP2191DSG
EAN61849601
IC702
3
IN_2
2
IN_1
4
EN
1
GND
5
FLG
6
OUT_1
7
OUT_2
8
NC
10K
R714
USB2_CTL
+5V_USB_2
+5V_Normal
22uF
10V
C717
22uF
10V
C719
J P 7 1 8
J P 7 1 9
5.6V
D721
OPT
CM2012FR10KT
L712
COMP2_ADC_FILTER_L
0
L710-*1
COMP2_NON_ADC_FILTER
0
L711-*1
COMP2_NON_ADC_FILTER
10K
R760
470K
R744
COMP2_Y+/AV_CVBS_IN
+3.3V_Normal
12K
R758
20V
D724
OPT
10K
R756
P P J 2 4 5 - 0 2
JK710
6A
[RD1]C-SPRING
7A
[RD1]E-LUG
4A
[RD1]CONTACT
5B
[WH]C-SPRING
8C
[RD2]E-LUG-S
6C
[RD2]C-SPRING
4C
[RD2]CONTACT
5D
[BL]C-SPRING
4E
[GN]CONTACT
6E
[GN]C-SPRING
7E
[GN]E-LUG
10K
R745
47pF
50V
50V
C732
COMP2_ADC_FILTER
10K
R759
AV_CVBS_DET
1000pF
50V
50V
C731
READY
5.6V
D723
OPT
75
R740
0 . 1 u F
16V
C738
20V
D720
OPT
+3.3V_Normal
COMP2_Pb+
47pF
50V
50V
C733
COMP2_ADC_FILTER
47pF
50V
50V
C735
COMP2_ADC_FILTER
AV_COMP_PC_R_IN
0
L712-*1
COMP2_NON_ADC_FILTER
1K
R762
COMP2_DET
1000pF
50V
50V
C730
READY
COMP2_Pr+
AV_COMP_PC_L_IN
47pF
50V
50V
C736
COMP2_ADC_FILTER
CM2012FR10KT
L710
COMP2_ADC_FILTER_L
75
R741
20V
D722
OPT
47pF
50V
50V
C734
COMP2_ADC_FILTER
1K
R761
75
R742
5.6V
D726
OPT
5.6V
D725
OPT
47pF
50V
50V
C737
COMP2_ADC_FILTER
470K
R743
12K
R757
CM2012FR10KT
L711
COMP2_ADC_FILTER_L
0 . 1 u F
16V
C739
RS232C
RGB PC
5 . 1 5 M s t a r C i r c u i t A p p l i c a t i o n
SPDIF OPTIC JACK
REAR JACKS
7
LA3AA
2 0 1 3 . 0 2 . 2 8
JP_GND
USB2
USB1
OCP for USB_2
REAR COMPONENT/AV
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.
10K
R936
EXT_SPK
+3.5V_ST
22.0uH
L904
EXT_SPK
EXT_OUT_L
EXT_OUT_R
10K
R922
EXT_SPK
4.7K
R923
EXT_SPK
EXT_AMP_L
0 . 2 2 u F
50V
50V
C917
EXT_SPK
BLM18PG121SN1D
L902
EXT_SPK
4.7K
R935
EXT_SPK
47uF
25V
C923
EXT_SPK
+3.3V_Normal
EXT_AMP_R
10K
R933
EXT_SPK
4 . 7 u F
50V
50V
C916
EXT_SPK
EXT_SPK_DET
1uF
10V
C928
EXT_SPK
4.7K
R934
EXT_SPK
TPA3124D2PWPR
IC901
EXT_SPK
3
PVCCL_2
2
SD
4
MUTE
1
PVCCL_1
6
RIN
5
LIN
7
BYPASS
8
AGND_1
9
AGND_2
10
PVCCR_1
11
VCLAMP
12
PVCCR_2
13
PGNDR_1
14
PGNDR_2
15
ROUT
16
BSR
17
GAIN1
18
GAIN0
19
AVCC_1
20
AVCC_2
21
BSL
22
LOUT
23
PGNDL_1
24
PGNDL_2
1uF
OPT
C925
0 . 2 2 u F
50V
50V
C918
EXT_SPK
22.0uH
L905
EXT_SPK
0 . 1 u F
50V
50V
C915
EXT_SPK
10K
OPT
R932
EXT_OUT_R
SUB_AMP_MUTE
001:AB13
EXT_OUT_L
1uF
10V
C927
EXT_SPK
10K
R931
EXT_SPK
P E J 0 3 4 - 0 1
JK902
EXT_SPK
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
3
E_SPRING
100
R938
EXT_SPK
47uF
25V
C924
EXT_SPK
1uF
OPT
C926
+24V
0 . 1 u F
50V
C914
EXT_SPK
10K
OPT
R930
10K
R937
EXT_SPK
0 . 1 u F
50V
C913
EXT_SPK
100K
R939
EXT_SPK
MMBT3904(NXP)
Q903
EXT_SPK
E
B
C
10K
R924
EXT_SPK
4.7K
EXT_SPK
R920
+3.5V_ST
10K
OPT
R921
0 . 4 7 u F
50V
50V
C921
EXT_SPK
0 . 4 7 u F
50V
50V
C919
EXT_SPK
0 . 4 7 u F
50V
50V
C920
EXT_SPK
0 . 4 7 u F
50V
50V
C922
EXT_SPK
1uF
50V
50V
C911
EXT_SPK
1uF
50V
50V
C912
EXT_SPK
RJP / EXT AMP
9
LA2AW
2 0 1 2 . 0 9 . 1 1
EXT_SPEAKER
S i n g l e e n d e d
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
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