LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) 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.
0.1uF
16V
C608
OPT
100
R603
+3.5V_ST
BLM18PG121SN1D
L601
0
R604
IR_OUT_US
47K
R610
IR_OUT
KEY2
22
IR_OUT
R601
10K
1%
R606
+3.5V_ST
IR
10K
R607
IR_OUT_EU
BLM18PG121SN1D
L603
100
R602
+3.5V_ST
100pF
50V
C607
0.1uF
C604
BLM18PG121SN1D
L602
+3.5V_ST
0.1uF
C603
1000pF
50V
C602
10K
1%
R608
0.1uF
16V
C601
IR_OUT
KEY1
+3.5V_ST
3.3K
R611
1K
R605
IR_OUT_EU
LED_R
1.5K
R615
AMOTECH CO., LTD.
5.6V
VA602
OPT
AMOTECH CO., LTD.
5.6V
VA601
OPT
5.48VTO5.76V
ZD603
OPT
2SC3052
Q601
IR_OUT_EU
E
B
C
2SC3052
Q602
IR_OUT
E
B
C
1K
R609
IR_OUT
12507WR-08L
P601
1
2
3
4
5
6
7
8
9
I R / L E D a n d c o n t r o l f o r n o r m a l m o d e ls.
LA2AW
2 0 1 2 . 0 9 . 1 1
IR/CONTROL
6
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.
1K
RGB_PC
R732
10K
R707
100
R711
DSUB_DET
JP708
0.1uF
C706
100
R710
68pF
50V
OPT
C718
5.6V
D702
AV_CVBS_IN
ADMC 5M 02 200L
5.6V
OPT
VA708
AV_CVBS_DET
AV_COMP_PC_R_IN
68pF
50V
OPT
C720
0.1uF
16V
C711
+3.3V_Normal
12K
R709
5.6V
OPT
VA707
PM_TXD
MMBD6100
RGB_PC
D710
A2
C
A1
1K
R712
5.6V
OPT
D705
AV_COMP_PC_L_IN
+3.3V_Normal
+3.3V_Normal
JP709
+3.5V_ST
470K
R702
0.1uF
C703
0.33uF
C701
470K
R703
DSUB_HSYNC
0.1uF
16V
NON_CI_CAP_RGB_PC
C724
1K
R705
DSUB_B+
DSUB_VSYNC
ADUC 20S 02 010L
20V
OPT
VA705
DSUB_G+
PM_RXD
PPJ233-01
JK701
4A
[YL]O-SPRING
5A
[YL]E-LUG
3A
[YL]CONTACT
4B
[WH]C-LUG
5C
[RD]E-LUG
4C
[RD]O-SPRING
3C
[RD]CONTACT
100pF
50V
C709
ADUC 20S 02 010L
20V
RGB_VARISTOR
VA703
0.1uF
C705
18pF
50V
NON_CI_CAP_RGB_PC
C721
0.1uF
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
120-ohm
L701
CDS3C30GTH
30V
OPT
OPT
D704
10K
R704
ADUC 20S 02 010L
20V
OPT
VA701
RGB_DDC_SCL
12
K
R
70
8
75
RGB_PC
R718
75
RGB_PC
R719
10K
RGB_PC
R729
220pF
50V
OPT
C710
5.6V
OPT
VA706
75
RGB_PC
R720
2.2K
RGB_PC
R724
330pF
50V
C713
0.1uF
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
0.1uF
C704
330pF
50V
C712
120-ohm
L702
IR_OUT
5.6V
D703
F
ib
e
r
O
p
ti
c
JST1223-001
SPDIF-JACK-SOLTEAM
JK702-*1
1
GND
2
VCC
3
VINPUT
4
F
IX
_P
O
L
E
CDS3C30GTH
30V
OPT
D706
10K
R706
DSUB_R+
ci
t
p
O
r
e
bi
F
2F01TC1-CLM97-4F
SPDIF-JACK-FOXCONN
JK702
3
VIN
2
VCC
1
GND
4
D
L
EI
HS
30V
D701
18pF
50V
NON_CI_CAP_RGB_PC
C723
SPG09-DB-010
RGB_PC
JK705
1
R
ED
2
G
R
EE
N
3
B
LU
E
4
G
N
D
_1
5
D
D
C
_G
N
D
6
R
ED
_G
N
D
7
G
R
EE
N
_G
N
D
8
B
LU
E_
G
N
D
9
N
C
1
0
SY
N
C
_G
N
D
1
1
G
N
D
_2
1
2
D
D
C
_D
A
TA
1
3
H
_S
Y
N
C
1
4
V
_S
Y
N
C
1
5
D
D
C
_C
LO
C
K
1
6
SH
IL
E
D
75
R701
SPDIF_OUT
47pF
50V
C708
JP_GND1
JP_GND2
JP_GND3
JP_GND4
USB1_DM
TH
ER
M
A
L
TPS2066CDGNR
IC702
USB1&2
3
EN1
2
IN
4
EN2
1
GND
5
FLT2
6
OUT2
7
OUT1
8
FLT1
9
[EP]GND
10K
R713
/USB1_OCD
+3.3V_Normal
USB1_CTL
10uF
10V
C715
+5V_USB
/USB2_OCD
USB2_DP
0.1uF
16V
C714
10uF
10V
C722
+5V_USB_1
USB1_CTL
+5V_USB_2
+5V_USB
USB2_CTL
+5V_USB_1
AP2191DSG
EAN61849601
IC703
only USB1
3
IN_2
2
IN_1
4
EN
1
GND
5
FLG
6
OUT_1
7
OUT_2
8
NC
M
AE
RT
S
N
W
O
D
BS
U
3AU04S-305-ZC-(LG)
JK703
1
2
3
4
5
10uF
10V
C716
USB1&2
R
C
L
A
M
P0
50
2B
A
O
PT
D
70
9
U
SB
D
O
W
N
S
TR
EA
M
3AU04S-305-ZC-(LG)
JK704
USB1&2
1
2
3
4
5
USB1_DP
/USB1_OCD
+3.3V_Normal
R
C
L
A
M
P0
50
2B
A
O
PT
D
70
8
+5V_USB_2
USB2_DM
10uF
10V
C719
USB1&2
10K
R714
USB1&2
10uF
10V
C717
+5V_USB_1
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
L-MONO
Rear AV
REAR JACKS
7
LA2AW
2 0 1 2 . 0 9 . 1 1
JP_GND
USB2
OCP only for USB1
OCP for USB1/2
USB1
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.
5V_HDMI_2
DDC_SDA_2
DDC_SCL_1
DDC_SDA_4
D0+_HDMI2
DDC_SDA_1
+5V_Normal
5V_DET_HDMI_2
D0-_HDMI2
5V_DET_HDMI_4
2.7K
R813
5V_HDMI_1
10K
R808
D1-_HDMI4
CEC_REMOTE_S7
5V_HDMI_4
D1-_HDMI2
1.8K
R802
10K
R811
D2+_HDMI2
100
R816
CK+_HDMI2
2.7K
R820
H
D
M
I_
2
10K
R809
HDMI_2
D2-_HDMI4
CK-_HDMI2
0.1uF
16V
C802
NON_CI_CAP
DDC_SDA_4
HDMI_CEC
1K
R803
HDMI_2
D2-_HDMI2
D2-_HDMI1
HPD2
0.1uF
16V
C801
NON_CI_CAP_HDMI_2
5V_HDMI_2
CK-_HDMI1
DDC_SDA_1
+5V_Normal
HDMI_CEC
1K
R801
DDC_SCL_4
D1-_HDMI1
CK+_HDMI4
10K
R821
HDMI_SIDE
10K
HDMI_SIDE
R823
1.8K
HDMI_SIDE
R815
DDC_SCL_2
20
33
20
95
G
A
E
JK801
la
mr
o
N_
2_
I
M
D
H
14
13
5
D1_GND
20
SHIELD
12
11
2
D2_GND
19
18
10
CK+
4
D1+
1
D2+
17
9
D0-
8
D0_GND
3
D2-
16
7
D0+
6
D1-
15
D0-_HDMI4
HPD4
D2+_HDMI1
D1+_HDMI2
1.8K
R804
HDMI_2
3
.3
K
R
80
5
+5V_Normal
DDC_SDA_2
HDMI_CEC
HPD1
20
33
20
95
G
A
E
JK802
la
mr
o
N_
1_
I
M
D
H
14
13
5
D1_GND
20
SHIELD
12
11
2
D2_GND
19
18
10
CK+
4
D1+
1
D2+
17
9
D0-
8
D0_GND
3
D2-
16
7
D0+
6
D1-
15
HDMI_CEC
D0-_HDMI1
5V_DET_HDMI_1
D0+_HDMI1
D0+_HDMI4
CK-_HDMI4
2.7K
R812
DDC_SCL_1
5V_HDMI_4
DDC_SCL_2
10K
R810
HDMI_2
2.7K
R819
H
D
M
I_
2
3
.3
K
H
D
M
I_
SI
D
E
R
81
7
D1+_HDMI1
DDC_SCL_4
0.1uF
16V
NON_CI_CAP_HDMI_SIDE
C803
5V_HDMI_1
D1+_HDMI4
CK+_HDMI1
1K
HDMI_SIDE
R814
D2+_HDMI4
3
.3
K
R
80
6
H
D
M
I_
2
2.7K
R827
H
D
M
I_
SI
D
E
2.7K
R828
H
D
M
I_
SI
D
E
MMBT3904(NXP)
Q801
E
B
C
MMBT3904(NXP)
Q802
HDMI_2
E
B
C
MMBT3904(NXP)
HDMI_SIDE
Q804
E
B
C
MMBD6100
D801
2
A
C
1
A
MMBD6100
D802
H
D
M
I_
2
2
A
C
1
A
MMBD6100
D803
H
D
M
I_
SI
D
E
2
A
C
1
A
OPT
VA803
VA803
VA802
OPT
VA801
OPT
51U019S-312HFN-E-R-E-LG
JK803-*1
SIDE_HDMI_32LS3500
14
RESERVED
13
CEC
5
TMDS_DATA1_SHIELD
20
BODY_SHIELD
12
TMDS_CLK-
11
TMDS_CLK_SHIELD
2
TMDS_DATA2_SHIELD
19
HOT_PLUG_DETECT
18
VDD[+5V]
10
TMDS_CLK+
4
TMDS_DATA1+
1
TMDS_DATA2+
17
DDC/CEC_GND
9
TMDS_DATA0-
8
TMDS_DATA0_SHIELD
3
TMDS_DATA2-
16
SDA
7
TMDS_DATA0+
6
TMDS_DATA1-
15
SCL
0
HDMI1_ARC
R807
HDMI_ARC
YKF45-7054V
HDMI_2_BDP_Model
JK801-*1
14
NC
13
CEC
5
DATA1_SHIELD
20
SHIELD
12
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
19
HPD
18
+5V_POWER
10
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
16
SDA
7
DATA0+
6
DATA1-
15
SCL
YKF45-7054V
HDMI_1_BDP_Model
JK802-*1
14
NC
13
CEC
5
DATA1_SHIELD
20
SHIELD
12
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
19
HPD
18
+5V_POWER
10
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
16
SDA
7
DATA0+
6
DATA1-
15
SCL
E
A
G
62
61
12
04
H
D
M
I_
SI
D
E
JK803
14
13
5
D1_GND
20
BODY_SHIELD
12
11
2
D2_GND
19
18
10
CK+
4
D1+
1
D2+
17
9
D0-
8
D0_GND
3
D2-
16
7
D0+
6
D1-
15
HDMI/RJP
8
HDMI_2
For CEC
SIDE_HDMI
HDMI
HDMI_1
For BDP In-Packing Model
- EMI Gasket Touch Jack
LA2AW
2 0 1 2 . 0 9 . 1 1
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.
4
7
u
F
25
V
C
92
3
E
X
T
_S
PK
4.7K
R935
EXT_SPK
EXT_OUT_L
0.1uF
50V
C914
EXT_SPK
EXT_AMP_L
10K
R931
EXT_SPK
1uF
50V
C911
EXT_SPK
4.7uF
50V
C916
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
EXT_OUT_R
4.7K
R923
EXT_SPK
SUB_AMP_MUTE
001:AC13
1uF
50V
C912
EXT_SPK
10K
OPT
R930
22.0uH
L905
EXT_SPK
10K
OPT
R932
0.1uF
50V
C913
EXT_SPK
10K
R933
EXT_SPK
BLM18PG121SN1D
L903
EXT_SPK
0.1uF
50V
C915
EXT_SPK
100
R922
EXT_SPK
22.0uH
L904
EXT_SPK
MMBT3904(NXP)
Q903
EXT_SPK
E
B
C
+24V
EXT_AMP_R
4.7K
R934
EXT_SPK
10K
R928
EXT_SPK
100
R924
EXT_SPK
B
L
M
18
PG
12
1S
N
1D
L
9
0
2
E
X
T
_S
PK
4
7
u
F
25
V
C
92
4
E
X
T
_S
PK
0.22uF
50V
C918
EXT_SPK
+3.5V_ST
0.22uF
50V
C917
EXT_SPK
100
R940
OPT
100
OPT
R925
10K
R936
EXT_SPK
10K
R937
EXT_SPK
100K
R939
EXT_SPK
EXT_SPK_DET
1uF
OPT
C925
EXT_OUT_R
1uF
OPT
C926
100
R938
EXT_SPK
+3.3V_Normal
EXT_OUT_L
10K
RJP
R914
0
.0
1
u
F
R
JP
C
90
7
0
.0
1
u
F
R
JP
C
90
2
1uF
25V
OPT
C903
+12V
5
.1
V
R
JP
Z
D
90
3
22uF
16V
OPT
C908
0
RJP_PROTECTION
R906
5
.1
V
R
JP
Z
D
90
4
RJP_CTRL4
510 RJP
R912
0
.0
1
u
F
R
JP
C
90
5
5.1K
RJP_PROTECTION
R903
3
.9
K
R
JP
R
91
6
0
.0
1
u
F
R
JP
C
90
6
RJP_CTRL1
2.2uF
16V RJP
C901
3
.9
K
R
JP
R
91
7
10K
RJP
R902
3
.9
K
R
JP
R
91
5
5
.1
V
R
JP
Z
D
90
2
5.1K
RJP_PROTECTION
R904
510 RJP
R913
100K
RJP_PROTECTION
R908
RJP_CTRL2
5
.1
V
R
JP
Z
D
90
1
8
.2
K
R
JP
R
91
9
1K
RJP_PROTECTION
R905
510 RJP
R909
0
RJP_NORMAL
R907
5
.1
V
R
JP
Z
D
90
5
KRJV9768-1001-024
RJP
JK901
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
RJP_CTRL3
AO3407ARJP_PROTECTION
Q901
G
D
S
BLM18PG121SN1D
RJP
L901
10K
RJP
R901
0
.0
1
u
F
R
JP
C
90
4
510 RJP
R911
AO3407A RJP
Q902
G
D
S
RJP_CTRL0
3
.9
K
R
JP
R
91
8
510 RJP
R910
PEJ034-01
JK902
EXT_SPK
6B T_TERMINAL2
7B B_TERMINAL2
5 T_SPRING
4 R_SPRING
3 E_SPRING
2.2uF
50V
C919
EXT_SPK
2.2uF
50V
C921
EXT_SPK
2.2uF
50V
C920
EXT_SPK
2.2uF
50V
C922
EXT_SPK
10K
EXT_SPK
R941
1uF
10V
C927
EXT_SPK
1uF
10V
C928
EXT_SPK
RJP / EXT AMP
9
LA2AW
2 0 1 2 . 0 9 . 1 1
Single ended
EXT_SPEAKER
RJP
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