LG 55LV355B-UA / 55LV355C-UA (CHASSIS:LA0AC) 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
C462
0.1uF
16V
C432
1/16W 330K 5%
R452
AOZ1072AI-3
IC406
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
100
R480
PANEL_VCC
0.1uF
16V
C477
0.1uF
16V
C470
0.1uF
16V
C411
V_SYNC
4
.7
K
R
48
6
O
PT
AO3438
Q408
55INCH
G
D
S
5
.6
K
R
44
0
10uF
25V
C405
22uF
10V
C476
1/16W
15K
5%
R455
0.1uF
16V
C416
OPT
100pF
50V
OPT
C423
2200pF
C413
NR8040T3R6N
3.6uH
L422
PWM_DIM
100pF
50V
C463
0.1uF
16V
C441
22K
R431
1/16W
56K
1%
R449
+3.5V_ST
100pF
50V
OPT
C427
10
K
R
44
5
0.1uF
16V
C407
OPT
10uF
10V
C430
ERROR_OUT
+3.3V_Normal
+3.5V_ST
L420
A_DIM
0.1uF
16V
C431
L413
SCAN_BLK1/OPC_OUT
L
4
1
7
2.2K
R407
L
4
1
2
+3.3V_Normal
10
K
1%
R
46
2
22uF
16V
C420
10K
R459
3.9K
R606
OPT
OPT
RT1P141C-T112
Q402
1
2
3
33
K
R
43
9
10uF
10V
C461
0.1uF
16V
C473
AO3407A
Q409
G
D
S
1
.5
K
1%
R
41
6
0.1uF
16V
C455
1K
R419
10K
R456
2SC3052
Q406
E
B
C
10
K
R
46
4
FW20020-24S
P403
OPT
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
SMAW200-H24S2
P401
19
12V
14
GND
9
3.5V
4
24V
18
INV ON
13
GND
8
GND
3
24V
17
12V
12
3.5V
7
GND
2
24V
16
GND/V-sync
11
3.5V
6
GND
1
PWR ON
20
A.DIM
15
GND
10
3.5V
5
GND
21
12V
22
P.DIM1
23
GND/P.DIM2
24
Err OUT
25
+12V/+15V
0.1uF
16V
C438
AOZ1073AIL-3
IC401
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
47
K
1%
R
45
7
10uF
25V
C410
51
K
1%
R
41
4
100K
R404
POWER_ON/OFF2_2
INV_CTL
POWER_ON/OFF2_1
+24V
1608
0.1uF
50V
C451
OPT
10
K
R
44
3
55
IN
C
H
0.1uF
16V
C428
OPT
0.1uF
16V
C408
OPT
100K
R488
L
4
1
6
TP5305
+12V/+15V
POWER_DET
2SC3052
Q401
E
B
C
4
.7
K
1%
R
46
1
POWER_ON/OFF2_2
PANEL_CTL
004:E12;005:C10;005:S15
+12V/+15V
10K
R401
NR8040T3R6N
3.6uH
L415
0.1uF
16V
C440
100uF
16V
C401
10K
OPT
R427
10
K
R
46
3
O
PT
0.1uF
C474
27
K
1%
R
46
0
4.7K
R406
+2.5V_Normal
22uF
10V
C453
POWER_ON/OFF1
12K
R458
+1.5V_FRC_DDR
0.1uF
16V
C468
4
.7
u
F
O
PT
C
44
5
TP5304
SCAN_BLK2
4.7uF
10V
OPT
C435
NR8040T3R6N
3.6uH
L423
+12V/+15V
+3.5V_ST
0.1uF
16V
C406
0.1uF
16V
C444
2.2K
R405
POWER_ON/OFF2_1
22uF
10V
C472
+3.5V_ST
10K
R426
OPT
12
0K
O
PT
R
43
4
1/16W
7.5K
5%
R436
1
R
47
3
1/16W 330K 5%
R432
0.1uF
16V
C475
MLB-201209-0120P-N2
L404
a_BEAD_MAG
0.1uF
16V
C404
10
K
1%
R
46
7
100pF
50V
C439
L
4
0
1
4700pF
50V
C467
+24V
+3.5V_ST
22
K
1%
R
44
4
+5V_USB
+3.3V_Normal
10K
R410
0.1uF
16V
C412
RL_ON
+1.5V_DDR
CIC21J501NE
L424
+3.5V_ST
+12V/+15V
TP5303
3300pF
50V
C448
2SC3052
Q407
E
B
C
MLB-201209-0120P-N2
L407
a_BEAD_MAG
+3.3V_Normal
+3.5V_ST
POWER_ON/OFF2_1
10K
R421
24
K
1%
R
44
2
10uF
10V
C403
100uF
16V
C402
FM20020-24
P404
OPT
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
25
10uF
16V
OPT
C442
68uF
35V
C426
100
R402
0.01uF
25V
C436
NR8040T3R6N
3.6uH
L406
+12V/+15V
0.1uF
16V
C424
47K
R429
0.1uF
16V
C485
AZ2940D-2.5TRE1
IC402
2
GND
3 VOUT
1
VIN
1/8W
75K
1%
R441
2SC3052
Q405
E
B
C
10K
OPT
R430
+1.26V_VDDC
0.1uF
50V
C418
22K
R435
NR8040T3R6N
3.6uH
L421
10
K
1%
R
42
3
6.8K
OPT
OPT
R418
0.1uF
16V
C447
AOZ1073AIL-3
IC405
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
22uF
10V
C456
+1.5V_DDR
100pF
50V
OPT
C429
2200pF
C466
NCP803SN293
IC409
1
GND
3
VCC
2 RESET
NCP803SN293
IC408
1
GND
3
VCC
2 RESET
THERMAL
TPS54319TRE
IC407
1
VIN_1
3
GND_1
7
C
O
M
P
9
SS/TR
10
PH_1
11
PH_2
12
PH_3
1
3
B
O
O
T
1
4
PW
R
G
D
1
5
EN
1
6
V
IN
_3
5
A
G
N
D
8
R
T
/C
L
K
6
V
SE
N
SE
4
GND_2
2
VIN_2
17
E
P
[G
N
D
]
0
5%
O
PT
R
45
0
8
.2
K
1%
R
48
2
1
.5
K
1%
R
40
3
0.01uF
50V
C465
0.01uF
50V
C488
MLB-201209-0120P-N2
L402
a_BEAD_MAG
CIS21J121
L402-*1
CIS21J121
L404-*1
CIS21J121
L407-*1
2
.7
K
1%
R
44
8
1/
10
W
1
.2
1
K
1%
R
44
7
10uF
25V
C443
10uF
25V
C457
10uF
25V
C458
10uF
25V
C459
10uF
25V
C460
0.015uF
50V
C409
12K
R454
12K
R413
22uF
16V
C469
2200pF
C464
THERMAL
SN1007054RTER
IC403
1
VIN_1
3
GND_1
7
C
O
M
P
9
SS
10
PH_1
11
PH_2
12
PH_3
1
3
B
O
O
T
1
4
PW
R
G
D
1
5
EN
1
6
V
IN
_3
5
A
G
N
D
8
R
T
/C
L
K
6
V
SE
N
SE
4
GND_2
2
VIN_2
17
E
P
[G
N
D
]
24
K
1%
R
46
5
51
K
1%
R
46
6
22uF
16V
C471
1
5%
R424
AP1117EG-13
IC410
ADJ/GND
OUT
IN
+5V_Normal
AP1117EG-13
IC411
ADJ/GND
OUT
IN
1
5%
R422
0.1uF
16V
C417
110
R408
0.1uF
16V
C414
110
R417
0.1uF
50V
C491
0.1uF
50V
C422
10uF
10V
C415
10uF
10V
C419
330
R409
330
R411
0.1uF
16V
C489
0.1uF
16V
C490
+5V_TUNER
0.1uF
16V
C492
0
OPT
R484
0
R
41
2
0
OPT
R453
0
O
PT
R
47
6
0
OPT
R472
0
OPT
R485
0
OPT
R451
0
R471
0
O
PT R4
75
100
OPT
R437
100
OPT
R425
100
R415
100
R420
OPT
INV_CTL1
POWER_ON/OFF2_2
004:AJ21;004:AK14;005:AB8
PANEL_CTL
004:Q25;005:C10;005:S15
INV_CTL
004:N22;005:S16
POWER_ON/OFF1
004:V23;005:AL16;019:D25
POWER_ON/OFF2_1
004:I5;004:U9;004:AD4;005:S17
12507WR-06L
OPT
P1101
1
2
3
4
5
6
7
RL_ON
004:A26;005:AL19
R1
New item
2 4 V - - > 3 . 7 8 V - - > 3 . 9 2 V ( 3 . 7 9 V )
2000 mA
Vout=(1+R1/R2)*0.8
3A
$ 0.145
1 8 . 5 V - - > 3 . 5 V - - > 3 . 7 5 V ( 3 . 5 9 V )
4A
MAX 1A
Vout=0.8*(1+R1/R2)
+3.5V_ST -> 3.375V
+3.3V_Normal
PANEL_POWER
+5V_Normal
S7M DDR 1.5V
S 7 M c o r e 1 . 2 6 V v o l t
2A
1934 mA
R1
2 0 V - - > 3 . 5 1 V - - > 3 . 7 6 V ( 3 . 5 9 V )
300 mA
Vout=0.8*(1+R1/R2)=1.29V
1 2 V - - > 3 . 5 8 V - - > 3 . 8 2 V ( 3 . 6 8 V )
R1
R2
R2
S T _ 3 . 5 V - - > 3 . 3 7 5 V - - > 3 . 4 6 V
+5V_USB
R2
3A
$ 0.165
FROM LIPS & POWER B/D
Power_DET
R1
R2
3A
1074 mA
Vout=(1+R1/R2)*0.8
+2.5V/+1.8V
R1
+1.5V_DDR_FRC
Vd=550mV
R2
Vout=0.827*(1+R1/R2)=1.521V
20101023
GP2R
POWER_LARGE
4
C421,C422 Close to LDO
Debug
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.
22
R1057
+3.5V_ST
+3.5V_ST
O
C
D
1A
T
P
1
0
0
1
NEC_ISP_Tx
POWER_ON/OFF2_1
10
K
R
10
09
AMP_RESET
CEC_ON/OFF
4.7M
R1034
OPT
0
.1
u
F
C
10
02
1
u
F
C
10
09
KEY2
NEC_ISP_Rx
NEC_EEPROM_SCL
KEY1
FL
M
D
0
22
R1065
SOC_RESET
AMP_RESET
NEC_SDA
22
R1010
OCD1A
MODEL1_OPT_2
10
K
R
10
30
22
R1090
TP1602
0.1uF
C1003
10
K
R
10
75
2
2
06
01
R
MODEL1_OPT_2
0.1uF
C1010
10K
R1091
TP1002
OCD1B
+3.5V_ST
S
/T
_S
D
A
S7
_N
E
C
_R
X
D
12505WS-12A00
P1001
1
2
3
4
5
6
7
8
9
10
11
12
13
47
K
R
10
46
22
R1049
22
R1081
N
E
C
_I
S
P
_T
x
NEC_ISP_Rx
TP1003
OCD1A
OCD1B
22
R1080
AT24C16BN-SH-B
IC1001-*1
a_EEPROM_NEC_16KBIT_ATMEL
3
NC_3
2
NC_2
4
GND
1
NC_1
5
SDA
6
SCL
7
WP
8
VCC
22
R1023
M24C16-WMN6T
IC1001
EEPROM_NEC_16KBIT_STM
3
NC/E2
2
NC/E1
4
VSS
1
NC/E0
5
SDA
6
SCL
7
WC
8
VCC
TP1601
1
5
p
F
C
10
07
PANEL_CTL
32.768KHz
X1002
a_CRYSTAL_EPSON
+3.5V_ST
2
2
R
10
39
PO
W
E
R
_O
N
/O
FF
2_
2
22
R1066
CEC_REMOTE_NEC
NEC_ISP_Tx
10K
R1073
OPT
uPD78F0514
IC1002
1
P60/SCL0
2
P61/SDA0
3
P62/EXSCL0
4
P63
5
P33/TI51/TO51/INTP4
6
P75
7
P74
8
P73/KR3
9
P72/KR2
10
P71/KR1
11
P70/KR0
12
P32/INTP3/OCD1B
1
3
P
31
/I
N
T
P
2/
O
C
D
1A
1
4
P
3
0
/I
N
T
P
1
1
5
P
1
7
/T
I5
0
/T
O
5
0
1
6
P
1
6
/T
O
H
1
/I
N
T
P
5
1
7
P
15
/T
O
H
0
1
8
P
14
/R
X
D
6
1
9
P
13
/T
X
D
6
2
0
P
1
2
/S
O
1
0
2
1
P
11
/S
L
10
/R
X
D
0
2
2
P
10
/S
C
K
10
/T
X
D
0
2
3
A
V
R
E
F
2
4
A
V
SS
25
ANI7/P27
26
ANI6/P26
27
ANI5/P25
28
ANI4/P24
29
ANI3/P23
30
ANI2/P22
31
ANI1/P21
32
P20/ANI0
33
P130
34
P01/TI010/TO00
35
P00/TI000
36
P140/PCL/INTP6
3
7
I
V
L
X
E/
0
P
T
NI/
0
2
1
P
3
8
P
4
1
3
9
P
4
0
4
0
R
E
SE
T
4
1
P
12
4/
X
T
2/
E
X
C
L
K
S
4
2
P
1
2
3
/X
T
1
4
3
FL
M
D
0
4
4
P
12
2/
X
2/
E
X
C
L
K
/O
C
D
0B
4
5
P
12
1/
X
1/
O
C
D
0A
4
6
R
E
G
C
4
7
V
SS
4
8
V
D
D
INV_CTL
1/
16
W
20
K
1%
R
10
89
CEC_ON/OFF
22
R1013
0
R1020
10
K
R
10
71
O
PT
32.768KHz
CRYSTAL_KDS
X1002-*1
2SC3052
Q1001
E
B
C
+3.5V_ST
22
R1078
10
K
R
10
12
OCD1B
K7
4
10
01
R
NEC_EEPROM_SCL
22
R1048
+3.5V_ST
22
R1019
4.7K
R4035
4.7K
R4034
1
5
p
F
C
10
08
10K
R1006
OPT
10
K
O
PT
R
10
11
+3.5V_ST
+3.5V_ST
22
R1076
AMP_MUTE
POWER_ON/OFF1
L
E
D
_R
/B
U
Z
Z
L
E
D
_B
/L
G
_L
O
G
O
0
.1
u
F
C
10
06
S7
_N
E
C
_T
X
D
10K
R1052
NEC_SCL
22
R1018
10
K
R
10
74
M
IC
O
M
_R
ES
ET
FLMD0
1/16W
20K
1%
R1047
2
2
14
01
R
22
R1056
2
2
73
01
R
N
E
C
_I
S
P
_R
x
S
/T
_S
C
L
+3.5V_ST
RL_ON
NEC_EEPROM_SDA
MICOM_RESET
EDID_WP
22
R1055
2
2
R
10
43
PANEL_CTL
10K
R1005
OPT
10K
R1050
2
2
86
01
R
22
R1008
PO
W
ER
_D
ET
10
K
O
PT
R
10
79
+3.5V_ST
10K
R1072
OPT
2
2
96
01
R
10
K
O
PT
R
10
04
10K
R1084
OPT
10K
R1083
OPT
IR
22
R1063
10K
R1002
NEC_EEPROM_SDA
GND
22
R1054
2
.7
K
R
10
14
2
.7
K
R
10
15
EXT_AMP_SD
SUB_MUTE
+
3
.5
V
_
S
T
TOP SIDE for reset.
EEPROM for Micom
NEC CONFIGURATION
MODEL_OPT_0
MODEL_OPT_3
(MODEL_OPT_3)
MICOM MODEL OPTION
(MODEL_OPT_0)
for Debugger
MODEL_OPT_1
(MODEL_OPT_1)
GP2R
MICOM Rev.4
20101125
5
31
HIGH
31
LOW
S/T & IIC LED & NO BUZZ & LED Blink
32/37/42/47/55LE5300
PIN NO.
8
HIGH
LOW
HIGH
LOW
HIGH
LOW
LOW
GP3
LOW
PWM_BUZZ/IIC_LED : For model that use LED Lighting used IIC
LOW
LOW
LOW
GPIO_LED
TACT_KEY
IIC LED(09Y IIC Protocol) & No BUZZ
HIGH
Low
LOW
MODEL_OPT_2
IIC LED & PWM BUZZ
LE7300
B/L_LED
HIGH
LOW
NON_GPIO_LED
HIGH : LAMP
LOW
30
PIN NAME
LV25/LV35/LV45/LW45/LV55/LK45/LK55
MODEL OPTION
MODEL OPTION
MODEL_OPT_0
TOUCH_KEY
PWM_BUZZ/IIC_LED
LOW
PWM_LED : For model that use LED Lighting used PWM Signal
LOW
LOW
PWM_BUZZ/IIC_LED :Using IIC for LED Breathing & PWM Buzz
MODEL_OPT_2
MODEL_OPT_0
PWM_LED
MODEL_OPT_3
HIGH
PIN NAME
8
D e s c r i p t i o n
LOW
LD350/450/550
HIGH
LOW : LED
HIGH
11
HIGH
PIN NO.
PWM_BUZZ/IIC_LED
GPIO LED & NO BUZZ
MODEL_OPT_1
TBD
B/L_LED
MODEL_OPT_1
KEY & PWM LED & No Buzz & No LED Blink
LOW
HIGH
HIGH
HIGH
PWM LED & No Buzz & No LED Blink
LK330/LK430/LK530
MODEL_OPT_2
30
MODEL_OPT_1
PWM_LED
TACT_KEY
PWM_LED : Using PWM Signal for LED Lighting
LOW
MODEL_OPT_3
LOW
MODEL_OPT_0
LOW
MODEL_OPT_0
LOW
IIC LED & PWM IIC BUZZ
MODEL_OPT_3
TBD
LK330/LK430 for KR/US
KEY & PWM LED & No Buzz & No LED Blink
MODEL_OPT_3
LOW
HIGH
LOW
LOW
MODEL_OPT_2
LOW
HIGH
11
TOUCH_KEY
10Y EYE-Q Sensor
2010Y,GP2
IIC LED(09Y IIC Protocol) & No BUZZ
B/L_LAMP
B/L_LAMP
GP2
19/22/26LE5300/5300
S/T & IIC LED & No Buzz & LED Blink
2011Y,GP2R, 101125 Update
LD420
MODEL_OPT_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.
100
R2402
12507WR-15L
P2402
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
BLM18PG121SN1D
L2404
18pF
50V
OPT
C2409
LED_B/LG_LOGO
47K
R2431
OPT
JP2407
2SC3052
Q2406
OPT
E
B
C
CDS3C05HDMI1
5.6V
D902
18pF
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
IR
0.1uF
C2401
100
R2412
S/T_SDA
JP2409
1000pF
50V
C2406
47K
R2425
OPT
+3.5V_ST
2SC3052
Q2405
OPT
E
B
C
0.1uF
16V
C2410
OPT
0.1uF
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
D903
18pF
50V
OPT
C907
0
R2427
+3.5V_ST
S/T_SCL
100
R2401
NEC_EEPROM_SDA
+3.5V_ST
18pF
50V
OPT
C2408
0.1uF
C2402
0.1uF
16V
C2403
22
R2428
5.6V
D2403
D2403
5.6V
D2404
5.6V
D2405
47K
R2426
2SC3052
Q3101 E
B
C
47K
R3104
47K
R3105
IR_OUT
+3.5V_ST
10K
OPT
R3103
2SC3052
Q3100
E
B
C
47K
OPT
R3102
0
R3101
+3.5V_ST
22
R3100
CONTROL
IR & LED
20101023
6
GP2R
IR/CONTROL-L
COMMERCIAL
Click on the first or last page to see other 55LV355B-UA / 55LV355C-UA (CHASSIS:LA0AC) service manuals if exist.