LG 37LK455C (CHASSIS:LB0AD) 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.
100
R2402
12507WR-12L
P2401
OLD_SUB
1
2
3
4
5
6
7
8
9
10
11
12
13
12507WR-15L
P2402
NEW_SUB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
BLM18PG121SN1D
L2404
18pF
50V
50V
OPT
C2409
LED_B/LG_LOGO
47K
R2431
OPT
JP2407
2SC3052
Q2406
OPT
E
B
C
CDS3C05HDMI1
5.6V
5.6V
D902
NEW_SUB
18pF
50V
50V
OPT
C906
1.5K
R2414
BLM18PG121SN1D
L2401
KEY1
+3.3V_Normal
JP2410
10K
R2416
OPT
10K
1%
R2405
NEC_EEPROM_SCL
AMOTECH
5.6V
D2402
100
R2411
EYEQ/TOUCH_KEY
IR
0 . 1 u F
C2401
100
R2412
EYEQ/TOUCH_KEY
S/T_SDA
JP2409
1000pF
50V
C2406
47K
R2425
OPT
+3.5V_ST
2SC3052
Q2405
OPT
E
B
C
0 . 1 u F
16V
C2410
OPT
0 . 1 u F
16V
C2405
100pF
50V
C2407
BLM18PG121SN1D
L2403
10K
1%
R2404
10K
R2430
OPT
1.5K
R2413
JP2408
1000pF
50V
C2404
JP2411
AMOTECH
5.6V
D2401
+3.5V_ST
+3.5V_ST
BLM18PG121SN1D
L2402
47K
R2429
OPT
KEY2
LED_R/BUZZ
CDS3C05HDMI1
5.6V
5.6V
D903
NEW_SUB
18pF
50V
50V
OPT
C907
0
R2427
+3.5V_ST
S/T_SCL
100
R2401
NEC_EEPROM_SDA
+3.5V_ST
18pF
50V
50V
OPT
C2408
0 . 1 u F
C2402
0 . 1 u F
16V
C2403
22
R2428
5.6V
D2403
EYEQ/TOUCH_KEY
5.6V
D2404
EYEQ/TOUCH_KEY
5.6V
D2405
47K
R2426
IR_OUT
10K
IR_OUT
R38
+3.5V_ST
2SC3052
IR_OUT
Q31
E
B
C
22
IR_OUT
R36
47K
IR_OUT
R40
2SC3052
IR_OUT
Q30
E
B
C
+3.5V_ST
1K
IR_OUT
R37
0
R41
IR_OUT_Brazil
1K
IR_OUT
R39
CONTROL
IR & LED
20101023
6
GP2R
IR/CONTROL-L
IR OUT
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.
0 . 1 u F
C1453
10uF
10V
10V
C1452
USB1_OCD
SIDE_USB_DP
22uF
16V
16V
C1451
1/8W
2K
1%
R1459
+5V_USB
USB1_CTL
1/8W
2K
1%
R1458
4.7K
OPT
R1455
SIDE_USB_DM
MLB-201209-0120P-N2
120-ohm
L1451
10K
R1454
+3.3V_Normal
47
R1451
CIS21J121
L1451-*1
USB DOWN STREAM
3AU04S-305-ZC-(LG)
JK1450
USB_JACK
1
2
3
4
5
AP2191DSG
EAN61849601
IC1450
3
IN_2
2
IN_1
4
EN
1
GND
5
FLG
6
OUT_1
7
OUT_2
8
NC
USB DOWN STREAM
3AU04S-345-ZC-H-LG
JK1450-*1
USB_JACK_LV3400
1
2
3
4
5
RCLAMP0502BA
D1451
OPT
SIGN6409
$ 0 . 0 7 7
USB_DIODES
20101023
GP2R
USB_OCP_DIODE
7
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.
HDMI_CEC
D2+_HDMI1
DDC_SDA_4
AT24C02BN-SH-T
IC802
HDMI_2_ATMEL
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
D1+_HDMI2
0 . 1 u F
C806
DDC_SDA_1
D804
D801
OPT
DDC_SDA_4
2SC3052
Q802
E
B
C
68K
R853
D1+_HDMI4
DDC_SCL_4
5V_DET_HDMI_1
GND
0 . 1 u F
C807
EDID_WP
D825
ENKMC2838-T112
D824
D824
A1
C
A2
+5V_Normal
DDC_SCL_2
CK-_HDMI2
5V_DET_HDMI_4
D1-_HDMI1
+5V_Normal
5V_HDMI_4
10K
R862
10K
R830
CEC_REMOTE_S7
ENKMC2838-T112
D822
D822
A1
C
A2
1K
R895
5V_HDMI_2
DDC_SCL_1
HPD2
+3.5V_ST
2SC3052
Q803
E
B
C
10K
R828
10K
R874
AVRL161A1R1NT
D826
OPT
D0-_HDMI1
J P 8 0 5
+5V_Normal
0 . 1 u F
16V
16V
C803
D1+_HDMI1
CK+_HDMI1
3.3K
R801
CK+_HDMI2
1.8K
R803
D2-_HDMI4
EDID_WP
D2-_HDMI1
D811
OPT
0
OPT
R855
D1-_HDMI4
5V_HDMI_4
+3.3V_Normal
CEC_ON/OFF
DDC_SDA_2
AT24C02BN-SH-T
IC801
HDMI_1_ATMEL
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
10K
R856
22
R882
0 . 1 u F
16V
16V
C802
1.8K
R837
EAG59023302
JK802
HDMI_1
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
22
R881
D802
OPT
GND
DDC_SCL_2
BSS83
Q805
S
B
D
G
CEC_REMOTE_NEC
DDC_SCL_4
GND
HDMI_CEC
CK+_HDMI4
J P 8 0 6
68K
R854
22
R875
3.3K
R835
HPD1
HPD4
D0+_HDMI1
22
R878
HDMI_CEC
D0+_HDMI2
1.8K
R804
1K
R897
0 . 1 u F
16V
16V
C810
0 . 1 u F
16V
16V
C801
D0+_HDMI4
AVRL161A1R1NT
OPT
D803
5V_HDMI_1
BSS83
Q806
S
B
D
G
22
R876
0 . 1 u F
16V
16V
C805
DDC_SDA_1
10K
R893
AT24C02BN-SH-T
IC804
HDMI_SIDE_ATMEL
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
EAG59023302
JK801
HDMI_2
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
D1-_HDMI2
GND
CK-_HDMI1
EDID_WP
22
R877
D2+_HDMI2
ENKMC2838-T112
D821
D821
A1
C
A2
D0-_HDMI4
1K
R896
D2+_HDMI4
3.3K
R802
DDC_SCL_1
0
OPT
R883
10K
R873
10K
R871
0 . 1 u F
C809
D2-_HDMI2
68K
OPT
OPT
R857
5V_DET_HDMI_2
5V_HDMI_1
DDC_SDA_2
D0-_HDMI2
68K
R892
CK-_HDMI4
2SC3052
Q801
E
B
C
5V_HDMI_2
EAG62611201
JK803
HDMI_SIDE
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
0
R824
0
R841
0
R815
J P 8 1 2
J P 8 1 0
R1EX24002ASAS0A
IC801-*1
HDMI_1_RENESAS
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
R1EX24002ASAS0A
IC802-*1
HDMI_2_RENESAS
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
R1EX24002ASAS0A
IC804-*1
HDMI_SIDE_RENESAS
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
2.7K
R885
2.7K
R889
2.7K
R888
2.7K
R884
2.7K
R887
2.7K
R891
For CEC
HDMI EEPROM
HDMI_1
$0.055
SIDE_HDMI
$0.055
$0.055
HDMI_2
20101023
GP2R
HDMI
8
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.
MMBT3904-(F)
Q1104
OPT
E
B
C
1000pF
50V
50V
C1115
OPT
100pF
50V
50V
C1121
DSUB_G+
30V
D1113
DSUB_R+
30V
D1111
10uF
16V
16V
C1118
HEAD_PHONE
5.6V
OPT
D1114
470K
R1103
MMBT3904-(F)
Q1103
OPT
E
B
C
10K
R1130
HEAD_PHONE_EXT_SPK
PC_L_IN
0 0 2 : S 1 2
68pF
50V
50V
OPT
C1122
100pF
50V
C1107
DSUB_DET
HP_ROUT
002:U7
30V
D1112
10K
R1142
100pF
50V
50V
C1108
RGB_DDC_SCL
DSUB_VSYNC
RGB_DDC_SDA
18pF
50V
C1128
22
R1143
2SC3052
Q1106
OPT
E
B
C
ISA1530AC1
Q1105
OPT
E
B
C
75
R1133
0 . 1 u F
16V
16V
C1131
ENKMC2838-T112
D1115
A1
C
A2
10K
R1110
10K
R1111
1K
R1125
HEAD_PHONE_EXT_SPK
MMBT3904-(F)
Q1102
OPT
E
B
C
5.6V
OPT
OPT
D1116
10K
R1146
+3.5V_ST
470K
R1102
+3.3V_Normal
+5V_Normal
HP_DET
1K
R1128
HEAD_PHONE_EXT_SPK
SPG09-DB-010
JK1104
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
15K
R1107
Fiber Optic
JST1223-001
JK1103
1
GND
2
VCC
3
VINPUT
4
FIX_POLE
+3.3V_Normal
75
R1135
1K
R1155
HEAD_PHONE_EXT_SPK
HP_LOUT
002:U7
68pF
50V
50V
OPT
C1126
10uF
16V
16V
C1119
HEAD_PHONE
SPDIF_OUT
0 0 2 : T 1 8
30V
D1109
0 . 1 u F
16V
C1129
PC_R_IN
0 0 2 : S 1 2
3.3K
R1129
OPT
75
R1137
+3.3V_Normal
AMOTECH
5.6V
OPT
D1101
EDID_WP
1K
R1147
SIDE_HP_MUTE
AT24C02BN-SH-T
IC1105
RGB_EEMPROM_ATMEL
3
A2
2
A1
4
GND
1
A0
5
SDA
6
SCL
7
WP
8
VCC
MMBT3904-(F)
Q1101
OPT
E
B
C
30V
D1110
KJA-PH-0-0177
JK3301
HEAD_PHONE_EXT_SPK
3
DETECT
4
L
5
GND
1
R
18pF
50V
C1127
DSUB_HSYNC
DSUB_B+
P E J 0 2 7 - 0 1
JK1102
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
1000pF
50V
50V
C1116
OPT
AMOTECH
5.6V
OPT
D1102
5.6V
D1117
OPT
15K
R1108
22
R1141
R1EX24002ASAS0A
IC1105-*1
RGB_EEMPROM_RENESAS
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
2.2K
R1139
2.2K
R1140
100
R26
EXT_SPK
10K
R28
EXT_SPK
22.0uH
L23
EXT_SPK
+24V
0 . 4 7 u F
50V
50V
C31
EXT_SPK
EXT_R_AMP_IN
0 . 1 u F
50V
C22
EXT_SPK
0 . 1 u F
50V
50V
C26
EXT_SPK
EXT_AMP_MUTE
0 . 2 2 u F
50V
50V
C25
EXT_SPK
10K
OPT
R29
AMP_RESET
TPA3124D2PWPR
IC20
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
R31
EXT_SPK
EXT_L_AMP_IN
10K
R30
EXT_SPK
0 . 2 2 u F
50V
50V
C24 EXT_SPK
10K
OPT
R27
1uF
50V
50V
C20
EXT_SPK
100
R25
OPT
4.7K
R32
EXT_SPK
BLM18PG121SN1D
L20
EXT_SPK
1uF
50V
50V
C28
EXT_SPK
22.0uH
L22
EXT_SPK
0 . 1 u F
50V
C23
EXT_SPK
1uF
50V
50V
C29
EXT_SPK
0 . 4 7 u F
50V
50V
C30
EXT_SPK
1uF
50V
50V
C21
EXT_SPK
EXT_OUT_L
2SC3052
EXT_SPK
Q20
E
B
C
1K
EXT_SPK
R33
10K
EXT_SPK
R34
EXT_OUT_L
009:AM21
EXT_OUT_R
009:AM20
10uF
35V
35V
C27
EXT_SPK
100uF
25V
C32
EXT_SPK
100uF
25V
C33
EXT_SPK
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
RGB/SPDIF/PC/HP/EXT SPEAKER
PC AUDIO
RGB PC
EARPHONE BLOCK or EXTERNAL SPEAKER JACK4
New Item Development
20101023
GP2R
RGB/SPDIF/HP
9
EXT_SPEAKER_AMP
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