LG 37LK450 (CHASSIS:LA01U) 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.
+3.3V_Normal
IC1401-*1
W25Q80BVSSIG
S_FLASH_MAIN_WINBOND
3
%WP[IO2]
2
DO[IO1]
4
GND
1
CS
5
DI[IO0]
6
CLK
7
HOLD[IO3]
8
VCC
R1401
0
OPT
/FLASH_WP
SPI_SDI
R1405
33
33
SPI_SDO
SPI_SCK
/SPI_CS
+3.3V_Normal
+3.3V_Normal
R1404
4.7K
R1403
10K
Q1401
KRC103S
KRC103S
OPT
E
B
C
C1401
0.1uF
IC1401
MX25L8006EM2I-12G
S_FLASH_MAIN_MACRONIX
3
WP#
2
SO/SIO1
4
GND
1
CS#
5
SI/SIO0
6
SCLK
7
HOLD#
8
VCC
SFLASH_1MB
20101023
13
GP2R
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.
FE_TS_DATA[3]
FE_TS_DATA[1]
FE_TS_DATA[5]
FE_TS_DATA[7]
FE_TS_DATA[2]
FE_TS_DATA[4]
FE_TS_DATA[6]
FE_TS_DATA[0]
R3723
0
FULL_NIM_CHINA
R3761
0
HALF_NIM
R3750
1K
OPT
TU_CVBS
R3768
1.2K
1.2K
HALF_NIM
C3737
100pF
50V
100pF
50V
R3707
0
OPT
FE_TS_CLK
C3705
100uF
16V
16V
FULL_NIM
R3742
4.7K
FULL_NIM
+5V_TU
C3704
0.1uF
16V
16V
C3709
0.01uF
25V
0.01uF
25V
BOOSTER_OPT
LNA2_CTL
RF_SWITCH_CTL
C3711
18pF
50V
18pF
50V
TU_I2C_NON_FILTER
R3766
1
1
1/10W
HALF_NIM
+3.3V_TU
R3741
1.2K
1.2K
TU_IIC_ATSC_SANYO
+5V_Normal
R3754
10K
10K
OPT
C3725
0.1uF
16V
16V
R3764
0
1/10W
FULL_NIM
IF_P_MSTAR
R3722
0
FULL_NIM
TUNER_RESET
R3702
100
FULL_NIM
R3760
0
HALF_NIM
TU3702-*2
TDTR-T035F
TDTR-T035F
NTSC_2INPUT_H_LGIT
14
+B3[3.3V]
13
+B2[1.2V]
5
NC_2
12
GND
11
VIDEO
2
BST_CTL
10
NC_4
4
NC_1[RF_AGC]
1
RF_S/W_CTL
17
DIF_1[N]
9
SIF
8
NC_3
3
+B1[5V]
16
IF/AGC
7
SDAT
6
SCLT
15
RESET
18
DIF_2[P]
19
SHIELD
R3743
10K
BOOSTER_OPT
R3752
220
R3753
4.7K
4.7K
R3737
2.2K
2.2K
BOOSTER_OPT
FE_TS_DATA[0-7]
C3703
100pF
50V
100pF
50V
C3719
22uF
10V
22uF
10V
R3703
150
OPT
OPT
Q3704
2SC3052
OPT
E
B
C
+1.2V/+1.8V_TU
R3745
10K
10K
BOOSTER_OPT
R3740
1.2K
1.2K
TU_IIC_ATSC_SANYO
R3705
0
RF_SW_OPT
+5V_TU
R3721
0
FULL_NIM
FE_TS_SYNC
R3735
TU_I2C_NON_FILTER
33
+3.3V_TU
IC3701-*1
SC4215ISTRT
FULL_NIM_SEMTEK
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
L3701
BLM18PG121SN1D
BOOSTER_OPT
C3713
18pF
50V
18pF
50V
TU_I2C_NON_FILTER
R3704
0
HALF_NIM
C3724
0.1uF
16V
16V
R3748-*1
10K
10K
FULL_NIM_BCD
C3729
0.1uF
16V
FULL_NIM
+3.3V_Normal
C3726
0.1uF
16V
0.1uF
16V
+3.3V_TU
L3704
FULL_NIM_BCD
R3736
TU_I2C_NON_FILTER
33
C3712
22pF
50V
22pF
50V
FULL_NIM
FE_TS_VAL_ERR
R3731
0
FULL_NIM
TU_SIF
R3725
0
FULL_NIM_CHINA
C3710
0.1uF
16V
IC3701
AP2132MP-2.5TRG1
FULL_NIM_BCD
3
VIN
2
EN
4
VCTRL
1
PG
5
NC
6
VOUT
7
ADJ
8
GND
9
[EP]
R3730
0
FULL_NIM
+5V_TU
C3730
10uF
10V
10uF
10V
FULL_NIM
DEMOD_SDA
+3.3V_TU
Q3702
2SC3052
BOOSTER_OPT
E
B
C
C3738
0.1uF
16V
0.1uF
16V
C3717
0.1uF
16V
R3734
0
BOOSTER_OPT
DEMOD_RESET
Q3703
ISA1530AC1
E
B
C
R3728
0
FULL_NIM
R3748
5.1K
FULL_NIM_SEMTEK
R3732
100
100
R3749
0
C3728
0.1uF
16V
16V
OPT
C3702
0.1uF
16V
+5V_Normal
IF_AGC_MAIN
+1.2V/+1.8V_TU
C3723
22uF
10V
22uF
10V
R3769
10K
FULL_NIM_BCD
R3724
0
FULL_NIM
R3771
10K
FULL_NIM_BCD
+1.2V/+1.8V_TU
+3.3V_TU
+3.3V_TU
C3707
100pF
50V
100pF
50V
IF_N_MSTAR
R3733
100K
R3744
4.7K
FULL_NIM
Q3705
ISA1530AC1
E
B
C
R3727
0
FULL_NIM
R3767
10
HALF_NIM
R3729
0
FULL_NIM
C3731
10uF
10V
10uF
10V
OPT
CONTROL_ATTEN
R3726
0
FULL_NIM
Q3701
ISA1530AC1
BOOSTER_OPT
E
B
C
TU_SCL
R3751
220
TU3702
TDTJ-S001D
TDTJ-S001D
DVB_1INPUT_H_LGIT
14
3.3V
13
1.2V
5
AS
12
GND
11
VIDEO
2
BST_CNTL
10
NC
4
NC[RF_AGC]
1
ANT_PWR[OPT]
17
DIF_1
9
SIF
8
NC[IF_TP]
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
19
SHIELD
+5V_TU
R3758
82
82
R3747
9.1K
1005
FULL_NIM
C3727
0.1uF
16V
C3701
0.1uF
16V
0.1uF
16V
R3770
10K
FULL_NIM_SEMTEK
TU_SDA
C3714
22pF
50V
22pF
50V
FULL_NIM
R3755
470
+5V_TU
DEMOD_SCL
R3762
0
OPT
C3708
0.1uF
16V
16V
R3701
100
FULL_NIM
IF_AGC_SEL
C3706
0.1uF
16V
0.1uF
16V
IC3703
AZ1117BH-ADJTRE1
HALF_NIM_1.2V_BCD
2
OUTPUT
3
INPUT
1
ADJ/GND
R3706
0
FULL_NIM_BR
TU3702-*3
UDA55AL
UDA55AL
GP3_ATSC_1INPUT_H_SANYO
14
+3.3V
13
+1.2V
5
AS
12
GND
11
VIDEO
2
NC_2
10
NC_3
4
NC[RF_AGC]
1
NC_1
17
DIF_1
9
SIF
8
NC(IF_TP)
3
+B[+5V]
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
19
SHIELD
TU3701-*2
TDFR-B036F
FULL_NIM_BR
1
RF_S/W_CNTL
2
BST_CNTL
3
+B1[5V]
4
NC_1[RF_AGC]
5
NC_2
6
SCLT
7
SDAT
8
NC_3
9
SIF
10
NC_4
11
VIDEO
12
GND
13
+B2[1.2V]
14
+B3[3.3V]
15
RESET
16
NC_5
17
SCL
18
SDA
19
ERR
20
SYNC
21
VALID
22
MCL
23
D0
24
D1
25
D2
26
D3
27
D4
28
D5
29
D6
30
D7
31
SHIELD
C3722
22uF
16V
22uF
16V
C3715
22uF
10V
22uF
10V
C3739
10uF
6.3V
10uF
6.3V
CN
C3741
10uF
10V
10uF
10V
HALF_NIM
C3740
0.1uF
16V
HALF_NIM
TU3701-*4
TDFR-C236D
CN_2INPUT_H_ALTO
1
RF_S/W_CNTL
2
BST_CNTL
3
+B1[+5V]
4
NC[RF_AGC]
5
NC_1
6
SCLT
7
SDAT
8
NC_2
9
SIF
10
NC_3
11
VIDEO
12
GND
13
+B2[1.2V]
14
+B3[3.3V]
15
RESET
16
NC_4
17
SCL
18
SDA
19
ERR
20
SYNC
21
VALID
22
MCL
23
D0
24
D1
25
D2
26
D3
27
D4
28
D5
29
D6
30
D7
31
SHIELD
TU3701
TDFR-C036D
CN_2INPUT_H_LG3911
1
RF_S/W_CNTL
2
BST_CNTL
3
+B1[+5V]
4
NC[RF_AGC]
5
NC_1
6
SCLT
7
SDAT
8
NC_2
9
SIF
10
NC_3
11
VIDEO
12
GND
13
+B2[1.2V]
14
+B3[3.3V]
15
RESET
16
NC_4
17
SCL
18
SDA
19
ERR
20
SYNC
21
VALID
22
MCL
23
D0
24
D1
25
D2
26
D3
27
D4
28
D5
29
D6
30
D7
31
SHIELD
L3703
MLB-201209-0120P-N2
L3702
MLB-201209-0120P-N2
IC3703-*1
AP1117EG-13
HALF_NIM_1.2V_DIODES
ADJ/GND
OUT
IN
R3741-*1
1K
TU_IIC_NON_ATSC_SANYO
R3740-*1
1K
TU_IIC_NON_ATSC_SANYO
C3742
20pF
50V
20pF
50V
TU_I2C_FILTER
C3743
20pF
50V
20pF
50V
TU_I2C_FILTER
TU3702-*1
TDVJ-H101F
TDVJ-H101F
GP3_ATSC_1INPUT_H_LGIT
14
3.3V
13
1.2V
5
AS
12
GND
11
VIDEO
2
BST_CNTL
10
NC
4
NC[RF_AGC]
1
ANT_PWR[OPT]
17
DIF_1
9
SIF
8
NC(IF_TP)
3
+B
16
IF_AGC_CNTL
7
SDA
6
SCL
15
RESET
18
DIF_2
19
SHIELD
TU3702-*4
TDTJ-S101D
TDTJ-S101D
GP2R_AU_1INPUT_H_LGIT
14
+B3[3.3V]
13
+B2[1.2V]
5
MOPLL_AS
12
GND
11
VIDEO
2
NC_1
10
NC_3
4
RF_AGC
1
ANT_PWR
17
DIF_1[N]
9
SIF
8
NC_2
3
+B1[5V]
16
IF_AGC
7
SDA
6
SCL
15
RESET
18
DIF_2[P]
19
SHIELD
R3735-*1
TU_I2C_FILTER
COIL
R3736-*1
TU_I2C_FILTER
COIL
C3713-*1
20pF
50V
20pF
50V
TU_I2C_FILTER
C3711-*1
20pF
50V
20pF
50V
TU_I2C_FILTER
R2
R2
FE_AGC_SPEED_CTL
Close to the tuner
GP2R_LARGE_TUNER
1. should be guarded by ground
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
2. No via on both of them
3. Signal Width >= 12mils
Signal to Signal Width = 12mils
Ground Width >= 24mils
close to TUNER
BOOSTER : CHINA OPT
close to TUNER
R1
Vo=0.8*(1+R1/R2)
200mA
OPTION : RF AGC
FE_BOOSTER_CTL
The pull-up/down of LNA2_CTL
is depended on MODLE_OPT_1.
GPIO must be added for FE_BOOSTER_CTL
is depended on MODLE_OPT_1.
GPIO must be added for FE_BOOSTER_CTL
TUNER MULTI-OPTION
R1
380mA
should be guarded by ground
GPIO must be added.
close to TUNER
60mA
This was being applied to the only china demod,
so this has to be deleted in both main and ISDB sheet.
so this has to be deleted in both main and ISDB sheet.
Close to the CI Slot
close to IF line
Pull-up can’t be applied
because of MODEL_OPT_2
because of MODEL_OPT_2
location movement,0929
Add,0929
close to the tuner pin, add,09029
Size change
Size change
Please, check multi Item! 10/12
TUNER_L
20101023
14
GP2R
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.
WOOFER_L+
R5073
12
WOOFER
0.1uF
C5043
50V
WOOFER
R5053
4.7K
WOOFER
WOOFER
C5066
22000pF
50V
WOOFER
AMP_SCL
C5037
390pF
50V
WOOFER
WOOFER
0.1uF
C5051
16V
WOOFER
C5062
100pF
50V
WOOFER
D5004
100V
1N4148W
OPT
R5010
3.3
3.3
OPT
WOOFER_R-
C5009
1000pF
50V
WOOFER
R5061
12
WOOFER
C5039
0.47uF
50V
WOOFER
0.1uF
C5061
50V
WOOFER
WOOFER_R+
C5057
1uF
25V
WOOFER
D5001
100V
1N4148W
OPT
R5064
3.3K
WOOFER
WOOFER
WOOFER
WOOFER_R+
C5050
10uF
35V
10uF
35V
WOOFER
L5052
BLM18PG121SN1D
WOOFER
+24V
R5060
100 WOOFER
C5063
18pF
50V
18pF
50V
WOOFER
AUD_LRCK
C5052
22000pF
50V
WOOFER
R5013
12
WOOFER
R5008
0
0
OPT
C5040
0.47uF
50V
WOOFER
R5052
12
WOOFER
R5012
10K
WOOFER
POWER_DET
+1.8V_AMP2
C5059
0.1uF
16V
0.1uF
16V
WOOFER
0.1uF
C5041
50V
WOOFER
L5053
BLM18PG121SN1D
WOOFER
+3.3V_Normal
R5004
100 WOOFER
+3.3V_Normal
R5063
33
WOOFER
C5005
0.1uF
16V
WOOFER
+1.8V_AMP2
AMP_RESET
AUD_SCK
+24V
C5036
390pF
50V
WOOFER
D5003
100V
1N4148W
OPT
R5070
100
WOOFER
IC503
AP1117E18G-13
WOOFER
2
OUT
3
IN
1
ADJ/GND
P5050
SMAW250-05
WOOFER
1
2
3
4
5
C5015
22pF
50V
SMD
22pF
50V
SMD
OPT
WOOFER_R-
R5055
10K
WOOFER
L5055
BLM18PG121SN1D
WOOFER
C5054
18pF
50V
18pF
50V
WOOFER
0.1uF
C5073
WOOFER
C5071
1000pF
50V
WOOFER
C5072
10uF
10V
OPT
C5064
10uF
10V
OPT
AUD_LRCH
WOOFER_L-
R5058
4.7K
WOOFER
C5014
22pF
50V
SMD
22pF
50V
SMD
OPT
R5059
12
WOOFER
0.1uF
C5044
50V
WOOFER
R5074
4.7K
WOOFER
D5002
100V
1N4148W
OPT
C5058
10uF
10uF
10V
OPT
C5032
0.01uF
50V
0.01uF
50V
OPT
C5035
390pF
50V
WOOFER
AUD_MASTER_CLK
C5034
10uF
35V
10uF
35V
WOOFER
0.1uF
C5056
50V
WOOFER
WOOFER
+1.8V_AMP2
WOOFER_L+
R5023
4.7K
WOOFER
C5068
1uF
25V
WOOFER
+1.8V_AMP2
R5068
1
WOOFER
0.1uF
C5033
50V
WOOFER
C5069
10uF
10V
10uF
10V
WOOFER
R5065
12
WOOFER
0.1uF
C5042
50V
WOOFER
AMP_SDA
R5005
33
WOOFER
WOOFER_L-
Q5050
2SC3052
WOOFER
E
B
C
AMP_MUTE
R5071
12
WOOFER
C5055
1uF
25V
WOOFER
C5004
0.1uF
16V
0.1uF
16V
WOOFER
R5077
10K
1/16W
5%
WOOFER
+3.5V_ST
0.1uF
C5008
16V
WOOFER
C5065
22pF
50V
SMD
22pF
50V
SMD
OPT
C5038
390pF
50V
WOOFER
0.1uF
C5070
50V
WOOFER
C5067
22000pF
50V
WOOFER
WOOFER
L5054
BLM18PG121SN1D
WOOFER
C5030
22000pF
50V
WOOFER
R5054
100 WOOFER
R5050
12
WOOFER
C5053
1uF
25V
WOOFER
IC502
NTP-7100
EAN60969603
WOOFER
1
BST1A
2
VDR1A
3
/RESET
4
AD
5
DGND_1
6
GND_IO
7
CLK_I
8
VDD_IO
9
DGND_PLL
10
AGND_PLL
11
LF
12
AVDD_PLL
13
DVDD_PLL
14
GND
15
DGND_2
16
DVDD
17
SDATA
18
WCK
19
BCK
20
SDA
21
SCL
22
MONITOR0
23
MONITOR1
24
MONITOR2
25
/FAULT
26
VDR2B
27
BST2B
28
PGND2B_1
29
PGND2B_2
30
OUT2B_1
31
OUT2B_2
32
PVDD2B_1
33
PVDD2B_2
34
PVDD2A_1
35
PVDD2A_2
36
OUT2A_1
37
OUT2A_2
38
PGND2A_1
39
PGND2A_2
40
BST2A
41
VDR2A
42
NC
43
VDR1B
44
BST1B
45
PGND1B_1
46
PGND1B_2
47
OUT1B_1
48
OUT1B_2
49
PVDD1B_1
50
PVDD1B_2
51
PVDD1A_1
52
PVDD1A_2
53
OUT1A_1
54
OUT1A_2
55
PGND1A_1
56
PGND1A_2
57
EP_PAD
L5004
NRS6045T100MMGK
WOOFER
10.0uH
L5007
NRS6045T100MMGK
WOOFER
10.0uH
L5005
NRS6045T100MMGK
WOOFER
10.0uH
L5006
NRS6045T100MMGK
WOOFER
10.0uH
C5060
1000pF
50V
1000pF
50V
WOOFER
WOOFER_L+
120 mA
WOOFER_R
Vd=1.4V
WOOFER_R-
WOOFER_L-
WOOFER_L
WOOFER_R+
WOOFER AMP
WOOFER_NTP
20101023
15
GP2R
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