LG 37LH50YR (CHASSIS:LP91B) 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.
TMDS3_RXC+
+5V_HDMI_1
TMDS3_RX2+
100
R304
HPD_MST_1
KDS184S
D300
A1
C
A2
TMDS3_RX0+
100
R327
DDC_SDA1
1K
R303
+5V_HDMI_3
CAT24C02WI-GT3
IC300
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
TMDS1_RX2+
TMDS2_RX1+
DDC_WP
TMDS3_RX1-
1K
R302
2SC3875S
RT1C3904-T112
Q300
E
B
C
10K
R312
SIDE_HDMI
+5V_HDMI_1
TMDS3_RX2-
2SC3875S
RT1C3904-T112
Q302
SIDE_HDMI
E
B
C
CEC
100
R318
TMDS2_RXC+
0.01uF
C300
KDS184S
D301
A1
C
A2
HPD_MST_3
2SC3875S
RT1C3904-T112
Q301
E
B
C
JP301
0.01uF
C302
JP304
DDC_SDA3
+5V_HDMI_3
DDC_WP
100
R307
JP305
1K
R314
SIDE_HDMI
TMDS2_RXC-
TMDS1_RX0-
0.01uF
C301
100
R329
DDC_WP
10K
R301
TMDS1_RX2-
TMDS2_RX1-
JP302
TMDS1_RXC+
DDC_SCL2
TMDS1_RX0+
TMDS3_RXC-
+5V_HDMI_2
100
R306
TMDS3_RX0-
100
R331
CEC
KJA-ET-0-0032
JK303
SIDE_HDMI
14
N
C
1
3
CEC
5
DATA1_SHIELD
20
JACK_GND
1
2
CLK-
11
CLK_SHIELD
2
DATA2_SHIELD
1
9
HPD
18
+5V_POWER
1
0
CLK+
4
DATA1+
1
DATA2+
17
DDC/CEC_GND
9
DATA0-
8
DATA0_SHIELD
3
DATA2-
1
6
SDA
7
DATA0+
6
DATA1-
1
5
SCL
+5V_MULTI
DDC_SCL1
+5V_MULTI
HPD_MST_2
TMDS2_RX2-
10K
R300
CAT24C02WI-GT3
IC301
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
DDC_SCL3
DDC_SDA2
KDS184S
D302
A1
C
A2
CEC
TMDS3_RX1+
JP300
TMDS1_RXC-
TMDS2_RX0-
+5V_MULTI
+5V_HDMI_2
100
R317
100
R305
CAT24C02WI-GT3
IC302
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
TMDS1_RX1+
JP303
TMDS1_RX1-
TMDS2_RX2+
TMDS2_RX0+
CEC
0
R313
68K CEC_READY
R315
CEC_C
MMBD301LT1G 30
V
CEC_READY
D303
CDS3C30GTH 30
V
CEC_READY
D304
+3.3V_MST
BSS83
Q303
CEC_READY
S
B
D
G
10K
R311
10K
R309
10K
R320
10K
R319
10K
R310
10K
R308
56000
R332
READY
JP306
JP307
JP308
QJ41193-CFEE1-7F
JK302
1
DATA2+
2
DATA2_SHIELD
3
DATA2-
4
DATA1+
5
DATA1_SHIELD
6
DATA1-
7
DATA0+
8
DATA0_SHIELD
9
DATA0-
10
CLK+
11
12
13
14
15
16
17
18
19
20
JACK_GND
21
.
22
QJ41193-CFEE1-7F
JK301
1
DATA2+
2
DATA2_SHIELD
3
DATA2-
4
DATA1+
5
DATA1_SHIELD
6
DATA1-
7
DATA0+
8
DATA0_SHIELD
9
DATA0-
10
CLK+
11
12
13
14
15
16
17
18
19
20
JACK_GND
21
.
22
MST_HPD : USE MST HPD
SW_HPD : USE SW HPD (Default)
OPTION
EAX58017401 Mstar LCD LH50
INPUT-HDMI
H6 LH50
3 12
2008/12/23
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
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.
4.7K
R421
2SC3052
Q405
IR-OUT
E
B
C
ZD402
SUB_SDA
+5VST_MST
10K
IR-OUT
R427
KEY2
120ohm
L406
+3.3V_MULTI_MST
120ohm
L403
IR
2SC3052
Q404
IR-OUT
IR-OUT
E
B
C
22
IR-OUT
R430
0.1uF
C408
ZD400
10K
IR-OUT
R429
470pF
C412
+5VST_MST
10K
IR-OUT
R428
SUB_SCL
KEY1
0.1uF
C407
READY
IR_OUT
500-ohm
L410
BEAD_USE LH20_30
BEAD_USE LH20_30
120ohm
L402
0
L410-*1
R_USE LH20_30
+5VST_MST
47uF
C406
470pF
C404
47K
IR-OUT
R426
+3.3V_MST
500-ohm
L411
BEAD_USE LH20_30
BEAD_USE LH20_30
0
L411-*1
R_USE LH20_30
R_USE LH20_30
4.7K
R420
0
R417
0.1uF
C411
+3.3V_MST
0
R400
READY
0.1uF
C414
ZD401
47pF
C403
12507WS-12L
P400
1
2
3
4
5
6
7
8
9
10
11
12
13
+3.3V_MST
MLB-201209-0120P-N2
L404
MLB-201209-0120P-N2
L407
CONTROL KEY
EAX58017401
Mstar LCD LH50
CONTROL KEY
H6 LH50
4 1 2
2008/12/23
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
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_AUDIO
6800pF
C701
MNT_LOUT
RT1C3904-T112
Q701
E
B
C
MNT_L_AMP
RT1C3904-T112
Q700
E
B
C
MNT_R_AMP
+12V_AUDIO
6800pF
C700
LM324D
IC701
3 INPUT1+
2 INPUT1-
4 VCC
1 OUT1
6 INPUT2-
5 INPUT2+
7 OUT2
8
OUT3
9
INPUT3-
10
INPUT3+
11
GND
12
INPUT4+
13
INPUT4-
14
OUT4
MNT_ROUT
+12V_AUDIO
33pF
C702
33pF
C703
0.01uF
C704
1K
R703
1K
R702
4.7K
R700
4.7K
R701
10K
R707
10K
R704
6.8K
R709
6.8K
R708
5.6K
R706
5.6K
R705
0.1uF
C707
0.1uF
C709
EAX58017401
Mstar LCD LH50
AMP & HOTEL OPTION
H6 LH50
7 1 2
2008/12/23
AMP :GAIN X 4
TV_MAIN
27pF
C502
10uF
16V
16V
C508
+5V_TUNER
27pF
C500
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
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.
10uH
L502
READY
270pF
C504
READY
M_SCL
47
R504
MAIN_SIF
M_SDA
47
R505
82pF
C507
READY
+5V_TUNER
ISA1530AC1
Q502
E
B
C
MLB-201209-0120P-N2
L500
READY
TAFT-Z203D
TU500
PAL_TUNER
14 NC_5
13 V-OUT
5 RF_AGC
12 NC_4
11 MOPLL_AS
2 GND_1
19 NC_8
18 NC_7
10 SCL
4 NC_2
1 NC_1
17 NC_6
9 SDA
8 GND_2
3 +B[5V]
16 SIF-OUT
7 NC_3
6 TP[3.3V_OPT]
15 A-OUT
21
SHIELD
20 NC_9
TAFT-H203F
TU500-*1
NTSC_TUNER
14
NC_5
13
V-OUT
5
RF_AGC
12
NC_4
11
MOPLL_AS
2
GND_1
19
NC_8
18
NC_7
10
SCL
4
NC_2
1
NC_1
17
NC_6
9
SDA
8
GND_2
3
+B[5V]
16
SIF-OUT
7
NC_3
6
TP[3.3V_OPT]
15
A-OUT
21
SHIELD
20
NC_9
220uF
16V
C505
220
R507
220
R506
4.7K
R502
0 . 0 1 u F
C501
0 . 1 u F
C503
N e a r t h e p i n
EAX58017401
Mstar LCD LH50
Mstar LCD LH50
TUNER
H6 LH50
5 1 2
2008/12/23
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.
22000pF
C623
22000pF
C625
SPK_R-
I2S_WS
4.7K
R667
3.3
R604
+3.3V_MULTI_AUD
0.1uF
C637
100pF
C601
3.3
R625
0
R656
READY
0.01uF
C671
0.1uF
C644
+1.8V_DVDD
390pF
C630
SPK_L-
+16V_NTP
3.3K
R600
3.3
R626
DA-8580
EAP38319001
L603
2S
1S
1F
2F
SPK_R+
22000pF
C611
1uF
C618
0.1uF
C610
0
R677
+1.8V
SPK_L-
0.1uF
C602
4.7K
R663
1000pF
C651
0.47uF
C632
390pF
C634
+16V_NTP
0
R673
0.01uF
C648
SPK_R-
+1.8V_DVDD
100
R603
SPK_R+
+1.8V_DVDD
MULTI_PW_SW
0.1uF
C626
M_SCL
0.01uF
C672
3.3
R635
0.1uF
C643
0.1uF
C669
4.7K
R623
DA-8580
EAP38319001
L607
2S
1S
1F
2F
I2S_SCK
0.01uF
C647
I2S_MCLK
0
R676
4.7K
R628
0.47uF
C673
22000pF
C616
390pF
C621
+3.3V_MULTI_AUD
1000pF
C606
1000pF
C603
+3.3V_MULTI_MST
+1.8V_AVDD
SPK_L+
SPK_L+
0.1uF
C617
100
R602
3.3
R671
M_SDA
SW_RESET
+1.8V_AVDD
0.1uF
C605
I2S_SDO
0.1uF
C629
1uF
C608
0.1uF
C607
0.1uF
C615
+1.8V_AVDD
0
R678
0.01uF
C613
1uF
C614
1uF
C624
100
R601
390pF
C619
10uF
16
V
C604
10uF
16
V
C600
SMAW250-04
P600
1
2
3
4
12
R608
12
R658
12
R610
12
R621
12
R605
12
R606
12
R622
12
R624
10uF
16
V
C609
NTP-3100L
IC600
1
BST1A
2
VDR1A
3
RESET
4A
D
5
DVSS_1
6
VSS_IO
7
CLK_I
8
VDD_IO
9
D
GND_PLL
10
AGND_PLL
11
LFM
12
AVDD_PLL
13
DVDD_PLL
14
TEST0
15
DVSS_2
16
DVDD
17
SDATA
18
WCK
19
BCK
20
SDA
21
SCL
22
MONITOR_0
23
MONITOR_1
24
MONITOR_2
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
330uF
35V
C612
10uF
35
V
C620
READY
0
R682
READY
MULTI_PW_SW
0
R609
READY
+3.3V_MST
RT1C3904-T112
Q601
E
B
C
10K
R611
10K
R607
33pF 50V
READY
C638
33pF
50V
READY
C639
MLB-201209-0120P-N2
L601
MLB-201209-0120P-N2
L605
MLB-201209-0120P-N2
L606
22K
READY
R612
SPK_L-
EAX58017401 Mstar LCD LH50
AUDIO
H6 LH50
6 12
2008/12/23
AUDIO MAIN AMP
Click on the first or last page to see other 37LH50YR (CHASSIS:LP91B) service manuals if exist.