LG 37LT760H (CHASSIS:LD2FF) 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.
C3802
0.1uF
C3803
0.1uF
+3.5V_ST
IR_OUT_RS232C
R3814
4.7K
C3801
0.1uF
JK3803
SPG09-DB-009
1
2
3
4
5
6
7
8
9
10
IC3800
MAX3232CDR
EAN41348201
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
R3811
4.7K
JP3809
C3800
0.1uF
JP3808
R3821
100
R3820
100
+3.5V_ST
EXT_12V
RS232_RX
RS232_TX
D3804
20V
20V
OPT
D3805
20V
20V
OPT
L3802
L3801
EXT_5V
C3804
0.1uF
IC3802
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
UART_SW2
R3847
0
C3813
0.1uF
0.1uF
R3843
0
NEC_TX
+3.5V_ST
NEC_RX
MTK_NEC_TX
IC3804
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
RS232_TX
C3811
0.1uF
0.1uF
R3842
0
RS232_RX
MTK_NEC_RX
R3846
0
JK_DBG_TX
JK_DBG_RX
MTK_DBG_TX
JP3802
DBG_SW
C3814
0.1uF
0.1uF
IC3805
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
NEC_DBG_TXD
C3818
1000pF
50V
OPT
UART_DBG_SW
EXT_SPK_VOL+
JK_DBG_TX
D3806
5.6V
OPT
IC3808
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
NEC_DBG_RXD
R3850
0
C3815
0.1uF
0.1uF
+3.5V_ST
IC3806
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
C3817
0.1uF
0.1uF
R3848
0
+3.5V_ST
+3.5V_ST
JK_DBG_RX
EXT_SPK_VOL-
MTK_DBG_RX
IC3807
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
C3819
1000pF
50V
OPT
D3807
5.6V
OPT
JP3801
C3816
0.1uF
JK3801
PEJ027-04
EXT_SPK_CONTROL
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
R3854
0
0
R3855
0
0
C3821
0.1uF
0.1uF
C3820
0.1uF
0.1uF
R3852
0
IC3809
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
R3853
0
IC3810
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
+3.5V_ST
EEPROM_SW
SDA_NVRAM
SCL_NVRAM
I2C_SDA5
NEC_EEPROM_SDA
NEC_EEPROM_SCL
I2C_SCL5
R3856
0
0
OPT
R3857
0
0
OPT
SOC_TX
RS232_RX
IC3812
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
R3858
0
IC3811
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
ON SEMICONDUCTOR
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
C3822
0.1uF
0.1uF
R3862
0
OPT
R3861
0
0
R3863
0
OPT
R3860
0
0
C3823
0.1uF
0.1uF
MTK_DBG_RX
RS232_TX
SOC_RX
UART_SW1
+3.5V_ST
R3859
0
MTK_DBG_TX
+3.5V_ST
D3803
50V
BAP70-02
R3834
1K
L3800
OPT
R3849
3.6K
R3851
3.6K
R3844
4.7K
R3845
4.7K
+3.5V_ST
+3.5V_ST
+3.3V_NORMAL
+3.3V_NORMAL
JP3810
JP3811
JP3812
R3835
0
R3836
0
RS232C
38
JACK_COMMON
2011.09.29
1A@5V /1A@12V FOR COMMERCIAL(RS-232C POWER)
xxLT760H-UA
H
Interactive
UART_SW2
L
B0 - A
CONNECTION
B1 - A
USB Download
EXT UART SWITCH
EXT_SPK_CONTROL & DBG OUT
CONNECTION
UART DBG SWITCH
B0 - A
EXT.SPK VOL Control
B1 - A
B0 - A
DEBUG_NEC/MTK
Debug MTK
Debug NEC
CONNECTION
B1 - A
L
UART_DBG_SW
L
DBG_SW
H
H
NVRAM I2C SWITCH
B0 - A
NVRAM - NEC
H
L
CONNECTION
NVRAM - MTK
UART_SW2
B1 - A
DBG_SW
B1 - A
H
B0 - A
MTK ADJ
L
CONNECTION
MTK 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.
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.
IR
+3.5V_ST
+3.5V_ST
R4102
10K
OPT
+3.5V_ST
R4104
47K
R4100
0
Q4100
2SC3052
OPT
E
B
C
Q4101
2SC3052
E
B
C
R4103
47K
R4101
47K
OPT
OPT
C4102
0.1uF
C4100
0.1uF
R4114
100
100
P4102
12507WR-10L
1
2
3
4
5
6
7
8
9
10
11
D4101
5.6V
AMOTECH
D4100
5.6V
AMOTECH
R4126
1.5K
L4100
BLM18PG121SN1D
C4107
100pF
100pF
50V
D4106
5.6V
CDS3C05HDMI1
C4101
0.1uF
16V
D4104
5.6V
AMOTECH
R4124
100
I_SENSOR
C4103
0.1uF
16V
OPT
D4105
5.6V
CDS3C05HDMI1
KEY2
R4123
100
I_SENSOR
KEY1
R4113
100
100
I2C_SDA2
I2C_SCL2
+3.5V_ST
C4104
1000pF
50V
LED_R
C4108
1000pF
50V
I_SENSOR
I_SENSOR
C4109
0.1uF
16V
I_SENSOR
C4110
0.1uF
16V
OPT
L4101
BLM18PG121SN1D
I_SENSOR
+3.3V_NORMAL
I2C_SDA3
I2C_SCL3
R4127
100
OPT
R4128
100
OPT
R4132
10K
+5V_ST
IR_OUT_HDMI1
R4136
10K
IR_OUT_CTRL
+5V_ST
R4133
22
R4141
22
R4139
30K
R4143
30K
IR_OUT_RS232C
+5V_ST
R4135
30K
+5V_ST
R4144
10K
R4140
10K
R4137
22
IR_OUT_HDMI2
R4131
22
IR_OUT_HDMI3
R4117
10K
1%
+3.5V_ST
R4118
10K
1%
L4103
BLM18PG121SN1D
L4102
BLM18PG121SN1D
R4107
47K
OPT
OPT
R4130
10K
R4134
10K
R4138
10K
R4142
10K
R4108
0
NON_I_SENSOR
R4109
10K
OPT
OPT
Q4102
2SC3052
E
B
C
Q4103
2SC3052
E
B
C
Q4105
2SC3052
E
B
C
Q4107
2SC3052
E
B
C
Q4108
2SC3052
E
B
C
Q4106
2SC3052
E
B
C
Q4104
2SC3052
E
B
C
IR & KEY
Zener Diode is
close to wafer
41
IR / KEY
2011.09.26
xxLT760H-UA
USB DOWN STREAM
USB DOWN STREAM
THERMAL
THERMAL
THERMAL
THERMAL
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.
D4303
RCLAMP0502BA
OPT
USB2SER_DP
C4309
0.1uF
16V
0.1uF
16V
M_REMOTE
JK4304
3AU04S-345-ZC-H-LG
1
2
3
4
5
+3.3V_USB2SER
C4321
10uF
10V
WIFI
C4320
0.1uF
16V
0.1uF
16V
WIFI
USB_CTL2
JK4303
3AU04S-345-ZC-H-LG
1
2
3
4
5
USB_CTL1
C4332
22pF
50V
22pF
50V
R4323
10K
R4309
15K
M_REMOTE
M_REMOTE_TX
C4315
20pF
M_REMOTE
C4329
3300pF
50V
R4307
91K
1%
OPT
C4318
22pF
M_REMOTE
/USB_OCD1
R4314
27K
1/10W
+3.3V_USB2SER
R4302
33
M_REMOTE_DEV
R4328
100K
L4302
BLM18PG121SN1D
WIFI
L4305
BLM18PG121SN1D
+3.3V_USB2SER
C4310
0.01uF
25V
0.01uF
25V
M_REMOTE
USB2SER_DM
+5V_USB
R4305
1M
1%
OPT
R4311
10K
OPT
OPT
C4319
0.1uF
16V
0.1uF
16V
WIFI
C4334
22uF
10V
10V
R4304
10K
M_REMOTE
USB_DM1
C4333
22uF
10V
22uF
10V
C4327
1uF
10V
10V
IC4305
TPS54425PWPR
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
R4312
10K
+5V_USB
C4323
10uF
10V
IC4306
TPS2554
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
[EP]
R4303
33
M_REMOTE_DEV
+3.3V_NORMAL
WIFI_DM
WIFI_DP
R4341
27K
1/10W
OPT
C4316
20pF
M_REMOTE
+12V
+3.3V_NORMAL
R4308
100K
1%
OPT
R4300
27K
1/10W
M_REMOTE_RX
+3.3V_USB2SER
POWER_ON/OFF2_4
+3.3V_NORMAL
C4317
22pF
M_REMOTE
C4328
0.1uF
0.1uF
/USB2SER_RESET
P4301
12507WR-04L
WIFI
1
VDD
2
DM
3
DP
4
GND
5
.
IC4303
TPS2554
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
[EP]
L4301
BLM18PG121SN1D
M_REMOTE
R4306
10K
M_REMOTE
R4301
1.5K
M_REMOTE
C4314
1uF
M_REMOTE
C4311
0.1uF
16V
0.1uF
16V
M_REMOTE
+5V_USB
C4313
0.1uF
16V
0.1uF
16V
M_REMOTE
R4330
120K
120K
1%
C4324
10uF
16V
16V
+5V_USB
C4340
10uF
10V
C4312
0.1uF
16V
M_REMOTE
0.1uF
16V
M_REMOTE
USB_DM2
/USB_OCD2
R4329
10K
R4327
10K
OPT
OPT
C4326
0.1uF
50V
0.1uF
50V
X4300
12MHz
M_REMOTE
R4313
27K
1/10W
OPT
L4308
2uH
D4304
RCLAMP0502BA
OPT
USB_DP2
R4310
10K
M_REMOTE
R4331
22K
22K
1%
+3.3V_USB2SER
D4300
RCLAMP0502BA
OPT
C4339
10uF
10V
WIFI
+5V_USB
IC4304
TUSB3410RHBR
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
2011.09.29
xxLT760H-UA
USB_WIFI
For EMI
DVR Ready
MAX 0.4A
Vout=(0.763+0.0017*Vout.set)*(1+R1/R2)=4.98V
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
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.
SC_L_IN
C4602
4700pF
4700pF
Q4601
MMBT3904(NXP)
E
B
C
C4604
0.1uF
0.1uF
SC_G
+12V
R4602
390
390
C4603
4700pF
4700pF
R4603
390
390
SC_DET
DTV/MNT_L_OUT
SC_ID
DTV/MNT_V_OUT
R4604
180
SC_B
SC_R_IN
+3.3V_NORMAL
R4607
15K
15K
SC_CVBS_IN
Q4600
MMBT3906(NXP)
E
B
C
C4600
1000pF
50V
50V
R4605
470
C4601
1000pF
50V
L4600
BLM18PG121SN1D
L4601
BLM18PG121SN1D
R4600
75
DTV/MNT_R_OUT
SC_FB
SC_R
R4606
47K
47K
C4606
0.1uF
0.1uF
50V
R4601
10K
R4608
0
OPT
D4611
5.6V
OPT
D4607
5.6V
OPT
D4606
5.6V
OPT
D4605
5.6V
5.6V
OPT
D4608
5.6V
OPT
D4601
5.6V
5.6V
OPT
D4601-*1
5.6V
ESD_MTK_SCART
200pF
D4605-*2
5.6V
ESD_LG1152_SCART
200pF
D4606-*2
5.6V
ESD_LG1152_SCART
200pF
D4601-*2
5.6V
5.6V
ESD_LG1152_SCART
200pF
D4611-*2
5.6V
ESD_LG1152_SCART
200pF
D4600
20V
OPT
D4600-*2
20V
20V
ESD_LG1152_SCART
10pF
C4605
100uF
16V
100uF
16V
C4607
47uF
25V
47uF
25V
D4611-*1
5.6V
ESD_MTK_SCART
200pF
D4609
5.5V
OPT
D4610
5.5V
OPT
D4603
5.5V
OPT
D4602
5.5V
5.5V
OPT
D4604
5.5V
OPT
D4609-*1
5.5V
ESD_MTK_SCART
15pF
D4609-*2
5.5V
5.5V
ESD_LG1152_SCART
15pF
D4610-*1
5.5V
ESD_MTK_SCART
15pF
D4602-*1
5.5V
5.5V
ESD_MTK_SCART
15pF
D4603-*1
5.5V
5.5V
ESD_MTK_SCART
15pF
D4604-*1
5.5V
5.5V
ESD_MTK_SCART
15pF
D4600-*1
20V
20V
ESD_MTK_SCART
10pF
D4605-*1
5.6V
ESD_MTK_SCART
200pF
D4606-*1
5.6V
5.6V
ESD_MTK_SCART
200pF
JK4600
PSC008-01
1
AUDIO_R_OUT
2
AUDIO_R_IN
3
AUDIO_L_OUT
4
AUDIO_GND
5
B_GND
6
AUDIO_L_IN
7
B_OUT
8
ID
9
G_GND
10
D2B_IN
11
G_OUT
12
D2B_OUT
13
R_GND
14
RGB_GND
15
R_OUT
16
RGB_IO
17
SYNC_GND1
18
SYNC_GND2
19
SYNC_OUT
20
SYNC_IN
21
COM_GND
22
AV_DET
DTV/MNT_L_OUT
+3.5V_ST
DTV/MNT_R_OUT
SCART_MUTE
R4625
4.7K
OPT
Q4603
MMBT3904(NXP)
E
B
C
Q4602
MMBT3904(NXP)
E
B
C
R4623
510
46
SCART GENDER
2011.10.26
Full Scart
Gain=1+Rf/Rg
CLOSE TO JUNCTION
Rf
Rg
[SCART AUDIO MUTE]
Click on the first or last page to see other 37LT760H (CHASSIS:LD2FF) service manuals if exist.