LG 26LT670H (CHASSIS:LA2AE) 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.
22uF
OPT
C3030
+12V_C_MPI
RJ12_MPI_DOUT
022:AH11
5
.6
V
O
PT
D
30
10
RJ12_IR_MPI_MODEM_buffer
0.1uF
16V
C3011
IF_P_MSTAR
bLAN_POWER_MANAGE
020:AG4;022:P17
0
B-LAN
R3006
1K
TU_IIC_NON_ATSC_SANYO
R3035-*1
+5V_ST_bLAN
1.2K
TU_IIC_ATSC_SANYO
R3037
0
B-LAN
R3013
0.1uF 16V
C3003
5
.6
V
O
PT
D
30
03
470
RJ12_MPI
R3059
220
RJ12_MPI
R3053
0
B-LAN
R3011
0
RJ12_MPI
R3016
RJ12_IR_MPI_MODEM_buffer
3.3K
R3040
220pF
RJ12_MPI
C3031
10
K
R
J1
2_
M
P
I
R3
02
4
33
TU_I2C_NON_FILTER
R3034
22
K
O
PT
R
30
66
GND
20pF
50V
TU_I2C_FILTER
C3023
GND
+12V_C
1W
2
0
0
B
-L
A
N
R
30
41
1
M
R
J1
2_
M
P
I
R3056
0.1uF
16V
C3016
BEXT_IR_MODEM
020:R5
100
R3025
BEXT_MPI_OUT
020:R8
BEXT_MPI_DIN
020:N15
0
B-LAN
R3019
22uF
16V
OPT
C3015
1K
TU_IIC_NON_ATSC_SANYO
R3037-*1
22
K
R
J1
2_
M
P
I
R3
05
0
MLB-201209-0120P-N2
B-LAN
L3002
0.1uF
16V
B-LAN
C3029
+5V_BLAN
0
R3001
20pF
50V
TU_I2C_FILTER
C3019-*1
0
B-LAN
R3012
0.1uF
16V
C3013
BEXT_MPI_DIN
020:R7
BEXT_Game_Control_Latch
020:R6
SPI_CLOCK
022:AM23
0
RJ12_MPI
R3018
100K
OPT
R3068
0
R3002
5
.6
V
O
PT
D
30
08
SPI_DIN
022:AM22
YFDW254-06S
OPT
P3000
4
3
2
6
1
5
RJ12_MPI_DOUT_buffer
10K
RJ12_MPI
R3054
0.1uF
16V
B-LAN
C3028
0
B-LAN
R3008
+5V_ST_bLAN
bLAN_POWER_MANAGE
020:AG8;022:P17
+5V_ST
+3.3V_TU
BEXT_5V
470
RJ12_MPI
R3044
SPI_DOUT
022:AM22
RJ12_MPI_DIN_buffer
100pF
50V
C3010
AO3407AB-LAN
Q3010
G
D
S
0
B-LAN
R3029
MPI_DIN
022:AI19
+12V_C_MPI
1/10W
3.3K
5%
B-LAN
R3042
BEXT_IR_MODEM
020:N14
RJ12_MPI_DIN_buffer
10
K
R
J1
2_
M
P
I
R3
04
7
0
B-LAN
R3027
COIL
TU_I2C_FILTER
R3033-*1
33
TU_I2C_NON_FILTER
R3033
0
RJ12_MPI
R3015
+5V_ST
0
B-LAN
R3022
10uF
10V
OPT
C3018
1/
10
W
10
K
5%
B
-L
A
N
R
30
38
BEXT_MPI_OUT
020:N15
1.2K
TU_IIC_ATSC_SANYO
R3035
IF_N_MSTAR
TUNER_RESET
20pF
50V
TU_I2C_FILTER
C3022
470K
RJ12_MPI
R3051
b_com_PWCTRL
020:AB5
0
B-LAN
R3020
18pF
50V
TU_I2C_NON_FILTER
C3019
0.1uF
16V
OPT
C3024
0
B-LAN
R3021
18pF
50V
TU_I2C_NON_FILTER
C3021
TU_SDA
5
.6
V
O
PT
D
30
05
5
.6
V
O
PT
D
30
04
3.3K
RJ12_MPI
R3069
5
.6
V
O
PT
D
30
07
JP3016
220pF
RJ12_MPI
C3026
MPI_DOUT
022:AM18
1K
R3036
0.1uF
16V
C3020
IF_AGC_MAIN
MLB-201209-0120P-N2
B-LAN
L3003
0
B-LAN
R3010
RJ12_IR_MPI_MODEM
022:AN14
20pF
50V
TU_I2C_FILTER
C3021-*1
+5V_ST
0
B-LAN
R3014
5
.6
V
O
PT
D
30
02
0
R3003
+5V_BLAN_TU
TU_SCL
1uF
10V
OPT
C3032
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.
BEXT_5V
1K
R
J1
2_
M
P
I
R3
05
7
4.
7K
R3
04
5
bLAN_IR_IN_MODEM
022:AN12
+3.3V_Normal
220
RJ12_MPI
R3072
47K
B
-L
A
N R3070
5
.6
V
O
PT
D
30
09
0
R3000
22uF
10V
C3012
+3.3V_TU
GND
BEXT_Game_Control_Latch
020:N14
1W
2
0
0
B
-L
A
N
R
30
39
220pF
RJ12_MPI
C3027
0.1uF
16V
C3009
+3.3V_TU
+5V_ST
COIL
TU_I2C_FILTER
R3034-*1
BEXT_5V
1uF
10V
B
-L
A
N
C3034
RJ12_MPI_DIN
022:AI8
0
RJ12_MPI
R3017
0.1uF
16V
B-LAN
C3017
30
V
O
PT
D
30
06
+3.3V_TU
22uF
10V
C3007
b_com_PWCTRL
020:M18
RJ12_MPI_DOUT_buffer
0
B-LAN
R3023
0
B-LAN
R3009
4.7K
RJ12_MPI
R3043
0
B-LAN
R3028
AO3407AB-LAN
Q3011
G
D
S
100pF
50V
C3014
+1.2V/+1.8V_TU
MLB-201209-0120P-N2
L3001
100K
R3026
1/10W
1
R3005
0.1uF
16V
C3000
0
R3004
150
OPT
R3007
+1.2V/+1.8V_TU
10uF
10V
C3008
+3.3V_TU
0.1uF
16V
C3006
22
K
R
J1
2_
M
P
I
R3
06
3
47K
B
-L
A
N
R3071
47K
B-LAN
R3058
47K
B-LAN
R3061
47
K
O
PT
R
30
65
10
K
B
-L
A
N
R
30
62
10KB-LAN
R3064
2.2K
OPT
R3073
2.2K
OPT
R3074
10K
OPT
R3067
PEJ027-01
BLAN_Sn
JK3001
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
PEJ027-04
BLAN_Au
JK3001-*1
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
0
BLAN
R3031
0
BLAN
R3032
0
BLAN
R3030
MJ-623PT-6-S-SD
BLAN
JK3000
1
2
3
4
5
6
7
MJ-623PT-6-S-SD
RJ12_MPI
JK3000-*1
1
2
3
4
5
6
7
AZ1117BH-1.8TRE1
IC3000
1
ADJ/GND
2 OUT
3
IN
KCN-BT-0-0056
JK3002
1
2
3
4
MLB-201209-0120P-N2
L3000
+5V_BLAN
+5V_BLAN_TU
0.1uF
16V
C3005
0.1uF
16V
C3002
22uF
16V
C3004
22uF
10V
C3001
220
TU_BUFFER
R3060
+3.3V_TU
0
TU_BUFFER
R3048
220
TU_BUFFER
R3052
1K
OPT
R3049
470
TU_BUFFER
R3076
+3.3V_TU
TU_CVBS
82
R3077
0
TU_NON_BUFFER
R3055
0
TU_NON_BUFFER
R3046
TU_SIF
4.7K
TU_BUFFER
R3075
MMBT3904(NXP)
B-LAN
Q3008
E
B
C
MMBT3904(NXP)
B-LAN
Q3009
E
B
C
MMBT3906(NXP)
TU_BUFFER
Q3003
E
B
C
MMBT3906(NXP)
Q3005
E
B
C
1uF
25V
B
-L
A
N
C3033
MMBT3906(NXP)
RJ12_MPI
Q3006
E
B
C
MMBT3904(NXP)
B-LAN
Q3000
E
B
C
RJ12_MPI
Q3002
E
B
C
RJ12_MPI
Q3004
E
B
C
MMBT3904(NXP)
RJ12_MPI
Q3007
E
B
C
MMBT3906(NXP)
B-LAN
Q3001
E
B
C
220pF
50V
B-LAN
C3025
TMMB-H002F
TU3001
1
SIF
2
+3.3V
3
SCL
4
SDA
5
IF_AGC
6
GND_1
7
CVBS
8
RESET
9
+1.8V
10
DIF_N
11
DIF_P
12
GND_2
13
+5V
14
JP2_P1
15
JP2_P4
16
J1_P2
17
J1_P3
18
J1_P4
19
J1_P5
20
PTS
21
JP1_P3
22
JP1_P4
23
JP1_P5
24
JP1_P6
25
JP1_P7
26
JP1_P10
27
J2_P1
28
J2_P2
29
J2_P3
30
J2_P4
31
J2_P6
32
SHIELD
20
S i z e c h a n g e
b_LAN Game control JACK
60mA
1 . s h o u l d b e g u a r d e d b y g r o u n d
2 . N o v i a o n b o t h o f t h e m
3 . S i g n a l W i d t h > = 1 2 m i l s
S i g n a l t o S i g n a l W i d t h = 1 2 m i l s
G r o u n d W i d t h > = 2 4 m i l s
NC
BLAN CHECK
RxD -->L
C l o s e t o t h e t u n e r
s h o u l d b e g u a r d e d b y g r o u n d
BLAN CHECK
MPI_DOUT
IR_OUT
MPI_5V or 12V
Tuner & b-LAN power
B-LAN & tuner
GND
12V_JIG
POWER LINE
M P I b u f f e r
TxD--> R
close to TUNER
close to TUNER
5V
b_LAN MPI pin3
BLAN CHECK
B-LAN POWER
M P I _ 5 V o r 1 2 V ( P I N 3 ) S e l e c t C o n t r o l fr o m b - L A N
MPI_DIN
T u n e r R F j a c k
p o w e r c o n t r o l
BLAN CHECK
B - l a n & T u n e r
Add,0929
5VST_JIG
5VST_JIG
add,0929
C a n t u n e r r e a d y
37LT670H-UA
LA1EY
20111008
l o c a t i o n m o v e m e n t , 0 9 2 9
S i z e c h a n g e
200mA
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.
+12V/+15V
5
.1
V
R
JP
Z
D
18
03
5
.1
V
R
JP
Z
D
18
02
3
.9
K
R
JP
R
18
26
3
.9
K
R
JP
R
18
28
AO3407A RJP
Q1803
G
D
S
5
.1
V
R
JP
Z
D
18
04
3
.9
K
R
JP
R
18
21
510 RJP
R1814
2.2uF
16V RJP
C1802
510 RJP
R1815
3
.9
K
R
JP
R
18
24
510 RJP
R1816
5
.1
V
R
JP
Z
D
18
01
510 RJP
R1817
RJP_CTRL0
RJP_CTRL1
RJP_CTRL2
RJP_CTRL3
RJP_CTRL4
510 RJP
R1818
3
.9
K
R
JP
R
18
20
5
.1
V
R
JP
Z
D
18
00
0
RJP_NORMAL
R1811
AO3407ARJP_PROTECTION
Q1802
G
D
S
22uF
16V
OPT
C1811
BLM18PG121SN1D
RJP
L1800
0
RJP_PROTECTION
R1810
5.1K
RJP_PROTECTION
R1807
5.1K
RJP_PROTECTION
R1804
10K
RJP
R1819
10K
RJP
R1801
10K
RJP
R1800
1K
RJP_PROTECTION
R1808
100K
RJP_PROTECTION
R1813
3
9
0
R
18
06
4.7K
R1836
R1836
EXT_SPK
002:T10
CB3216PA501E
L1801
OPT
R1822
OPT
R1823
SUB_MUTE
001:AC13;018:Q12
OPT
R1831
4
.7
K
R
18
37
100
R1833
3.3K
R1830
2SA1530A-T112-1R
Q1801
E
B
C
EXT_SPK_L+
018:AA8
15pF
50V
C1800
1
u
F
10
V
C
18
07
10uF
16V
C1812
1K
R
18
12
EXT_SPK_L-
018:AA9
9.1K
R1835
TPA6011A4PWPRG4
IC1800
3
PVDD_1
2
ROUT-
4
RHPIN
1
PGND_1
6
RIN
5
RLINEIN
7
VDD
8
LIN
9
LLINEIN
10
LHPIN
11
PVDD_2
12
LOUT-
13
PGND_2
14
LOUT+
15
SHUTDOWN
16
FADE
17
BYPASS
18
AGND
19
SEMAX
20
SEDIFF
21
VOLUME
22
HP/LINE
23
SE/BTL
24
ROUT+
0
R1825
6
.8
K
O
PT
R
18
32
+5V_Normal
+5V_Normal
O
PT
R
18
34
10
K
R
18
02
1
0
0
R
18
27
3K
R
18
03
1K
R
18
29
SUB_MUTE
001:AC13;018:T6
1K
R
18
05
PEJ027-01
EXT_SPK_Sn
JK1801
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
1uF
10V
OPT
C1816
0
R1839
0
R1838
PEJ027-04
EXT_SPK_Au
JK1801-*1
6B
T_TERMINAL2
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
1uF
10V
OPT
C1815
EXT_SPK_L-
018:H7
EXT_SPK_L+
018:N7
MMBT3904(NXP)
Q1804
E
B
C
0
.0
1
u
F
R
JP
C
18
10
0
.0
1
u
F
R
JP
C
18
06
0
.0
1
u
F
R
JP
C
18
04
0
.0
1
u
F
R
JP
C
18
09
0
.0
1
u
F
R
JP
C
18
08
0.1uF
OPT
C1803
0.1uF
C1813
1uF
25V
OPT
C1805
1
0
u
F
6
.3
V
C
18
01
1.6K
R1809
MMBT3904(NXP)
Q1800
E
B
C
MJ-657PT-8-SD
RJP
JK1800
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
1uF
50V
C1814
SIDE_JACK
20111008
18
37LT670H-UA
RJP
EXTERNAL SPEAKER 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.
5.6V
OPT
D1707
+3.3V_Normal
5.6V
D1706
470K
R1703
10K
R1708
10K
R1710
30V
D1700
PPJ233-01
JK1700
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
AV_COMP_PC_R_IN
12K
R1713
120-ohm
L1701
AV_CVBS_DET
AV_COMP_PC_L_IN
0.1uF
16V
C1702
10K
R1711
330pF
50V
C1703
5.6V
D1705
AV_CVBS_IN
120-ohm
L1700
330pF
50V
C1704
470K
R1702
75
R1700
1K
R1709
12
K
R
17
12
22
R906
30V
D900
DSUB_G+
0.1uF
16V
C904
30V
D904
5.6V
OPT
D905
75
R900
10K
R907
30V
D901
22
R905
+5V_Normal
+3.3V_Normal
2.2K
R903
DSUB_HSYNC
5.6V
OPT
D907
ENKMC2838-T112
D906
A1
C
A2
75
R902
68pF
50V
OPT
C900
DSUB_R+
RGB_DDC_SDA
75
R901
2.2K
R904
1K
R908
18pF
50V
C902
DSUB_B+
18pF
50V
C903
DSUB_DET
S
P
G
09
-D
B
-0
10
P
9
0
0
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
DSUB_VSYNC
68pF
50V
OPT
C901
30V
D903
5.6V
OPT
D908
RGB_DDC_SCL
30V
D902
SPI_SDO
/SPI_CS
W25Q80BVSSIG
S_FLASH_MAIN_WINBOND
IC1300-*1
3
%WP[IO2]
2
DO[IO1]
4
GND
1
CS
5
DI[IO0]
6
CLK
7
HOLD[IO3]
8
VCC
4
.7
K
O
PT
R
13
02
0.1uF
C1300
+3.5V_ST
KRC103S
OPT
Q1300
E
B
C
+3.5V_ST
SPI_SCK
33
R1303
+3.5V_ST
SPI_SDI
10
K
O
PT
R
13
01
/FLASH_WP
0
OPT
R1300
MX25L8006EM2I-12G
S_FLASH_MAIN_MACRONIX
IC1300
3
WP#
2
SO/SIO1
4
GND
1
CS#
5
SI/SIO0
6
SCLK
7
HOLD#
8
VCC
220pF
50V
OPT
C1701
47pF
50V
C1700
REAR_JACK
20111008
17
37LT670H-UA
L-MONO
Rear AV
RGB PC
S e r i a l F l a s h 1 M B
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.
WAFER-ANGLE
P501
1
2
3
4
SPK_L+
SPK_L-
SPK_R+
SPK_R-
12
R514
10.0uH
L504
AMP_RESET
390pF
50V
C532
33pF
50V
C509
0.1uF
50V
C519
THERMAL
NTP-7500L
IC501
1
AGND_PLL
2
AVDD_PLL
3
DVDD_PLL
4
LF
5
DGND_PLL
6
GND_1
7
DGND
8
DVDD
9
SDATA
10
WCK
11
BCK
12
SDA
1
3
SC
L
1
4
/F
A
U
L
T
1
5
M
O
N
IT
O
R
0
1
6
M
O
N
IT
O
R
1
1
7
M
O
N
IT
O
R
2
1
8
B
ST
2B
1
9
PG
N
D
2B
2
0
O
U
T
2B
_1
2
1
O
U
T
2B
_2
2
2
PV
D
D
2_
1
2
3
PV
D
D
2_
2
2
4
PV
D
D
2_
3
25
OUT2A_1
26
OUT2A_2
27
PGND2A
28
BST2A
29
VDR2
30
AGND
31
VCC_5
32
VDR1
33
BST1B
34
PGND1B
35
OUT1B_1
36
OUT1B_2
3
7
PV
D
D
1_
1
3
8
PV
D
D
1_
2
3
9
3_
1
D
D
VP
4
0
1_
A1
T
U
O
4
1
O
U
T
1A
_2
4
2
PG
N
D
1A
4
3
B
ST
1A
4
4
/R
E
S
E
T
4
5
A
D
4
6
G
N
D
_I
O
4
7
C
L
K
_I
4
8
V
D
D
_I
O
49
[E
P
]
1N4148W
100V
OPT
D502
+24V_AMP
0.1uF
16V
C514
12
R515
22000pF
50V
C526
10uF
10V
C515
0.01uF
50V
OPT
C525
4.7K
R517
10uF
10V
OPT
C511
AUD_LRCH
1000pF
50V
C505
4.7K
R518
0.1uF
50V
C540
0.1uF
50V
C502
0.1uF
50V
C538
AUD_LRCK
POWER_DET
AUD_MASTER_CLK
4.7K
R516
100
R506
390pF
50V
C530
AUD_SCK
AMP_SDA
AMP_MUTE
+3.3V_Normal
10uF
10V
OPT
C510
0.47uF
50V
C535
390pF
50V
C533
10K
R501
3.3K
R505
+24V
BLM18PG121SN1D
L502
SPK_L+
1000pF
50V
C516
22000pF
50V
C518
AMP_SCL
100pF
50V
C503
12
R513
12
R511
22000pF
50V
C527
10.0uH
L506
0.1uF
50V
C537
10K
R520
12
R509
2
2
0
0
0
p
F
50
V
C
51
7
10K
R521
CIS21J121
L501
0
OPT
R522
1uF
25V
C534
33pF
50V
C507
SPK_R-
0.1uF
50V
50V
C522
4.7K
R519
0.1uF
16V
C512
1000pF
50V
C504
10uF
35V
C523
0.1uF
50V
C521
12
R510
1N4148W
100V
OPT
D503
+24V_AMP
1uF
25V
C528
0.1uF
16V
C513
12
R512
0.1uF
16V
C508
OPT
SPK_L-
10.0uH
L505
10.0uH
L503
0.1uF
50V
50V
C520
100
R503
SPK_R+
1uF
25V
C529
1N4148W
100V
OPT
D501
10uF
35V
35V
C524
390pF
50V
C531
100
R504
+3.5V_ST
0.47uF
50V
C536
0.1uF
50V
C539
12
R508
10K
R502
1N4148W
100V
OPT
D504
0.1uF
50V
C501
+24V_AMP
MMBT3904(NXP)
Q501
E
B
C
3 . 3
OPT
R507
4.7uF
16V
C506
NTP7500
20111008
16
37LT670H-UA
SPEAKER_R
SPEAKER_L
Audio amp(NTP-7500)
Click on the first or last page to see other 26LT670H (CHASSIS:LA2AE) service manuals if exist.