LG 42LT760H-TA (CHASSIS:LB3AF) 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.
0 . 0 1 u F
50V
C2432
BLM18PG121SN1D
L2407
+1.5V_DDR
+5V_NORMAL
10uF
16V
16V
C2415
1/16W 330K 5%
R2432
MMBT3904(NXP)
Q2406
E
B
C
+3.5V_ST
0 . 1 u F
50V
C2401
BLM18PG121SN1D
L2405
0 . 0 1 u F
50V
C2422
100pF
50V
C2416
0 . 1 u F
16V
16V
C2406
10uF
10V
10V
C2418
1/16W
56K
1%
R2433
BLM18SG121TN1D
L2408
+24V
1uF
10V
10V
C2417
1/16W
15K
5%
R2431
100
R2425
AO3407A
Q2407
G
D
S
0 . 1 u F
16V
16V
C2412
100
R2419
MMBT3906(NXP)
Q2401
1
2
3
NCP803SN293
IC2401
1
GND
3
VCC
2
RESET
10K
R2435
+12V
1uF
25V
25V
C2440
OPT
0 . 1 u F
16V
C2423
100
R2418
OPT
10K
R2408
100K
R2416
NR8040T3R6N
3.6uH
L2409
INV_CTL
0 . 1 u F
16V
16V
C2429
ERROR_OUT
0
R2420
POWER_16_GND
+3.5V_ST
NR8040T3R6N
3.6uH
L2406
10K
OPT
R2421
PWM_DIM2
4.7K
OPT
R2424
THERMAL
TPS54319TRE
IC2403
1
VIN_1
3
GND_1
7
COMP
9
SS/TR
10
PH_1
11
PH_2
12
PH_3
13
BOOT
14
PWRGD
15
EN
16
VIN_3
5
AGND
8
RT/CLK
6
VSENSE
4
GND_2
2
VIN_2
17
EP[GND]
0
5%
5%
OPT
R2413
+12V
100K
R2417
L/DIM0_VS
0 . 1 u F
50V
50V
C2433
0 . 1 u F
16V
16V
C2419
0
POWER_16_VSYNC
R2423
22uF
10V
10V
C2430
PANEL_CTL
0 . 1 u F
16V
16V
C2410
0 . 1 u F
16V
C2420
POWER_DET
THERMAL
TPS54327DDAR
IC2404
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
3300pF
50V
50V
C2428
+12V
+3.5V_ST
0 . 1 u F
16V
16V
C2411
PWM_DIM1
+3.3V_NORMAL
NCP803SN293
IC2402
1
GND
3
VCC
2
RESET
0 . 1 u F
16V
16V
C2427
10K
1%
R2439
47K
1
%
R2434
+24V
100pF
50V
50V
C2426
PANEL_VCC
+3.5V_ST
0 . 1 u F
50V
50V
C2443
10K
R2437
A_DIM
0
POWER_24_GND
R2422
56K
1%
R2415
4700pF
50V
C2421
10K
R2442
MTK_EPI
1.8K
R2441
MTK_EPI
+12V
10K
R2430
RL_ON
+3.5V_ST
0 . 1 u F
50V
C2413
10K
R2401
10uF
16V
C2402
3300pF
50V
OPT
C2441
10K
R2403
0
OPT
R2400
2uH
L2404
10uF
16V
C2400
POWER_ON/OFF1
10K
1%
R2406
0 . 1 u F
16V
OPT
C2403
0 . 1 u F
16V
C2404
THERMAL
AOZ1038PI
IC2400
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
NC_1
8
NC_2
9
[EP]LX
+12V
10uF
10V
C2414
10uF
10V
C2409
10uF
10V
C2408
10uF
10V
C2407
+1.2V_MTK_CORE
BLM18PG121SN1D
L2400
22pF
50V
50V
C2445
0 . 1 u F
50V
50V
C2434
+12V
+3.3V_NORMAL
10uF
16V
16V
C2431
10K
1%
R2428
1uF
10V
10V
C2438
0 . 1 u F
C2437
22uF
10V
10V
C2442
3300pF
50V
C2439
10K
R2414
22uF
10V
10V
C2444
100K
R2407
2uH
L2411
+3.3V_NORMAL
33K
1%
R2427
BLM18PG121SN1D
L2410
THERMAL
TPS54425PWPR
IC2405
3
VREG5
2
VFB
4
SS
1
VO
6
PG
5
GND
7
EN
8
PGND1
9
PGND2
10
SW1
11
SW2
12
VBST
13
VIN1
14
VIN2
15
[EP]PGND
POWER_ON/OFF2_1
POWER_ON/OFF1
POWER_ON/OFF2_2
POWER_ON/OFF2_3
POWER_ON/OFF2_4
POWER_ON/OFF2_3
POWER_ON/OFF2_4
POWER_ON/OFF2_1
POWER_ON/OFF2_3
POWER_ON/OFF2_2
3.3K
R2402
4700pF
50V
C2405
5.6K
1%
R2404
0 . 1 u F
16V
16V
C24001
2.7K
1%
1%
R2410
PD_12V
1.5K
1%
1%
R2411
PD_24V
1.2K
1%
1%
R2409
PD_12V
8.2K
1%
1%
PD_24V
R2412
R2412
10uF
10V
C2446
10uF
10V
C2447
10uF
10V
C2424
10uF
10V
C2425
4 . 7 u F
50V
C2435
0
5%
5%
PD_3.5V
R2429
+3.5V_ST
10uF
10V
10V
C2448
5.6K
MTK_NON_EPI
R2441-*1
33K
MTK_NON_EPI
R2442-*1
10K
R2453
OPT
I2C_SCL5
I2C_SDA5
33
FOR LPB MODEL
R2458
12507WR-08L
FOR LPB MODEL
P2403
1
2
3
4
5
6
7
8
9
33
FOR LPB MODEL
R2459
SMAW200-H24S2
P2401
SLIM_32~55
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
FW20020-24S
NORMAL_EXCEPT_32
P2400
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
FM20020-24
P2402
NORMAL_32
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
10K
R2426
10K
R2460
22
POWER_24_ERROR_OUT
R2405
1/8W
2K
R2451
PANEL_DISCHARGE_REG
1/8W
2K
R2452
PANEL_DISCHARGE_REG
0
NON_37_LGD
R2462
MMBT3904(NXP)
Q2402
OPT
E
B
C
10K
OPT
R2461
+3.5V_ST
0
R2463
4.7K
R2464
OPT
UBW2012-121F
L2401
UBW2012-121F
L2402
UBW2012-121F
L2403
24
MID_POWER
2 0 1 1 . 0 9 . 2 9
Vout=0.827*(1+R1/R2)=1.521V
3A
On-semi
24V-->3.48V
TYP 1450mA
# 1 6 / # 2 0 / # 2 3
LD - GND OR USE
LE(N.L.D.) - OPEN
LE(N.L.D.) - OPEN
L E ( L . D . ) - U S E
R2
FROM LIPS & POWER B/D
R2
DDR MAIN 1.5V
PANEL_POWER
R1
R1
12V-->3.58V
Power_DET
n o t t o R E S E T a t 8 k V E S D
ST_3.5V-->3.5V
$ 0 . 1 4 5
3A
3A
+5V_Normal
Placed on SMD-TOP
*NOTE 17
R1
R2
V o u t = 0 . 8 * ( 1 + R 1 / R 2 )
4A
V o u t = ( 0 . 7 6 3 + 0 . 0 0 1 7 * V o u t . s e t ) * ( 1 + R 1 / R 2 )
+3.3V_NORMAL
MAX 3.4 A
R2
R1
xxLT760H-UA
FOR LPB Download
[To LED DRIVER]
IR
+3.5V_ST
+3.5V_ST
10K
R4102
OPT
+3.5V_ST
47K
R4104
0
R4100
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.
2SC3052
Q4100
OPT
E
B
C
2SC3052
Q4101
E
B
C
47K
R4103
47K
R4101
OPT
0 . 1 u F
C4102
0 . 1 u F
C4100
100
R4114
12507WR-10L
P4102
1
2
3
4
5
6
7
8
9
10
11
AMOTECH
5.6V
D4101
AMOTECH
5.6V
D4100
1.5K
R4126
BLM18PG121SN1D
L4100
100pF
50V
C4107
CDS3C05HDMI1
5.6V
5.6V
D4106
0 . 1 u F
16V
C4101
AMOTECH
5.6V
D4104
100
R4124
I_SENSOR
0 . 1 u F
16V
OPT
C4103
CDS3C05HDMI1
5.6V
D4105
KEY2
100
R4123
I_SENSOR
KEY1
100
R4113
I2C_SDA2
I2C_SCL2
+3.5V_ST
1000pF
50V
C4104
LED_R
1000pF
50V
C4108
I_SENSOR
0 . 1 u F
16V
C4109
I_SENSOR
0 . 1 u F
16V
OPT
C4110
BLM18PG121SN1D
L4101
I_SENSOR
+3.3V_NORMAL
I2C_SDA3
I2C_SCL3
100
OPT
R4127
100
OPT
OPT
R4128
10K
R4132
+5V_ST
IR_OUT_HDMI1
10K
R4136
IR_OUT_CTRL
+5V_ST
22
R4133
22
R4141
30K
R4139
30K
R4143
IR_OUT_RS232C
+5V_ST
30K
R4135
+5V_ST
10K
R4144
10K
R4140
22
R4137
IR_OUT_HDMI2
22
R4131
IR_OUT_HDMI3
10K
1%
R4117
+3.5V_ST
10K
1%
R4118
BLM18PG121SN1D
L4103
BLM18PG121SN1D
L4102
47K
R4107
OPT
10K
R4130
10K
R4134
10K
R4138
10K
R4142
0
R4108
NON_I_SENSOR
10K
OPT
R4109
2SC3052
Q4102
E
B
C
2SC3052
Q4103
E
B
C
2SC3052
Q4105
E
B
C
2SC3052
Q4107
E
B
C
2SC3052
Q4108
E
B
C
2SC3052
Q4106
E
B
C
2SC3052
Q4104
E
B
C
IR & KEY
Z e n e r D i o d e i s
c l o s e t o w a f e r
41
IR / KEY
2 0 1 1 . 0 9 . 2 6
xxLT760H-UA
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.
RCLAMP0502BA
D4303
OPT
USB2SER_DP
0 . 1 u F
16V
16V
M_REMOTE
C4309
USB DOWN STREAM
3AU04S-345-ZC-H-LG
JK4304
1
2
3
4
5
+3.3V_USB2SER
10uF
10V
C4321
WIFI
0 . 1 u F
16V
16V
C4320
WIFI
USB_CTL2
USB DOWN STREAM
3AU04S-345-ZC-H-LG
JK4303
1
2
3
4
5
USB_CTL1
22pF
50V
50V
C4332
10K
R4323
15K
M_REMOTE
R4309
M_REMOTE_TX
20pF
C4315
M_REMOTE
3300pF
50V
C4329
91K
1%
OPT
R4307
22pF
C4318
M_REMOTE
/USB_OCD1
1/10W
27K
R4314
+3.3V_USB2SER
33
R4302
M_REMOTE_DEV
100K
R4328
BLM18PG121SN1D
L4302
WIFI
BLM18PG121SN1D
L4305
+3.3V_USB2SER
0 . 0 1 u F
25V
25V
C4310
M_REMOTE
USB2SER_DM
+5V_USB
1M
1%
R4305
OPT
10K
OPT
OPT
R4311
0 . 1 u F
16V
16V
C4319
WIFI
22uF
10V
10V
C4334
10K
R4304
M_REMOTE
USB_DM1
22uF
10V
10V
C4333
1uF
10V
10V
C4327
THERMAL
TPS54425PWPR
IC4305
3
VREG5
2
VFB
4
SS
1
VO
6
PG
5
GND
7
EN
8
PGND1
9
PGND2
10
SW1
11
SW2
12
VBST
13
VIN1
14
VIN2
15
[EP]PGND
USB_DP1
10K
R4312
+5V_USB
10uF
10V
C4323
THERMAL
TPS2554
IC4306
3
IN_2
2
IN_1
4
ILIM_SEL
1
GND
5
EN
6
ILIM1
7
ILIM0
8
OUT_1
9
OUT_2
10
FAULT
11
[ E P ]
33
R4303
M_REMOTE_DEV
+3.3V_NORMAL
WIFI_DM
WIFI_DP
1/10W
27K
R4341
OPT
20pF
C4316
M_REMOTE
+12V
+3.3V_NORMAL
100K
1%
OPT
R4308
1/10W
27K
R4300
M_REMOTE_RX
+3.3V_USB2SER
POWER_ON/OFF2_4
+3.3V_NORMAL
22pF
C4317
M_REMOTE
0 . 1 u F
C4328
/USB2SER_RESET
12507WR-04L
P4301
WIFI
1
VDD
2
DM
3
DP
4
GND
5
.
THERMAL
TPS2554
IC4303
3
IN_2
2
IN_1
4
ILIM_SEL
1
GND
5
EN
6
ILIM1
7
ILIM0
8
OUT_1
9
OUT_2
10
FAULT
11
[ E P ]
BLM18PG121SN1D
L4301
M_REMOTE
10K
M_REMOTE
R4306
1.5K
R4301
M_REMOTE
1uF
M_REMOTE
C4314
0 . 1 u F
16V
16V
M_REMOTE
C4311
+5V_USB
0 . 1 u F
16V
16V
M_REMOTE
C4313
120K
1%
1%
R4330
10uF
16V
16V
C4324
+5V_USB
10uF
10V
C4340
0 . 1 u F
16V
16V
M_REMOTE
C4312
USB_DM2
/USB_OCD2
10K
R4329
10K
R4327
OPT
0 . 1 u F
50V
50V
C4326
12MHz
M_REMOTE
X4300
1/10W
27K
OPT
R4313
2uH
L4308
RCLAMP0502BA
OPT
D4304
USB_DP2
10K
M_REMOTE
R4310
22K
1%
R4331
+3.3V_USB2SER
RCLAMP0502BA
OPT
D4300
10uF
10V
C4339
WIFI
+5V_USB
THERMAL
TUSB3410RHBR
IC4304
M_REMOTE
1
VREGEN
3
VCC_1
7
DM
9
RESET
10
SDA
11
SCL
12
WAKEUP
13
CTS
14
DSR
15
DCD
16
RI/CP
17
SIN/IR_SIN
18
GND_2
19
SOUT/IR_SOUT
20
RTS
21
DTR
22
CLKOUT
23
TEST0
24
TEST1
25
VCC_2
26
X2
27
X1/CLKI
28
GND_3
29
P3.4
30
P3.3
31
P3.1
32
P3.0
5
PUR
8
GND_1
6
DP
4
VDD18
2
SUSPEND
33
[EP]
43
USB3_HUB_WiFi
2 0 1 1 . 0 9 . 2 9
xxLT760H-UA
USB_WIFI
For EMI
DVR Ready
MAX 0.4A
V o u t = ( 0 . 7 6 3 + 0 . 0 0 1 7 * V o u t . s e t ) * ( 1 + R 1 / R 2 ) = 4 . 9 8 V
4A
USB1
To SOC
MAX 1.8A
R1
USB2
+5V_USB FOR USB
R2
To SOC
MAX 1.8A
DVR Ready
USB To SERIAL I/F
To SOC
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