LG 37LH50YR (CHASSIS:LP91B) Service Manual ▷ View online
- 17 -
BLOCK DIAGRAM
RG
B
_
P
C
PC
_
A
u
d
io
TV
(R
F
)
COM
P
1
HDM
I1
HDM
I2
R
S
232
TX
232C
D
ri
v
e
r
S
T
3232C
Tx
/
R
x
:
±
15V
p
p
P
C
_
R
/
G
/B
/H
S
/
V
S
PC
_
A
u
d
io
_
L
/
R
:
700m
V
rm
s
MNT
_
V
O
U
T
:
1V
p
p
SI
D
E
_
V
:
1V
p
p
S
ID
E
_
L
IN
/
R
IN
:
500m
V
rm
s
DDR
2
S
D
R
A
M
(512M
B)
L
_
S
PK_
O
U
T
R
_
SPK_
O
U
T
EE
P
R
O
M
24C
02
Co
m
p
1
_
L
/
R
:
500m
V
rm
s
TU
N
E
R
AV
1
_
V
IN
:
1V
p
p
AV
1
_
L
IN/
R
IN
:
500m
V
rm
s
PW
M
N
T
P
3100L
MNT
_
O
U
T
MNT
_
LO
U
T
/
R
O
U
T
:
500m
V
rm
s
AV
2
(S
id
e
A
V
)
M
A
IN
S
C
A
L
E
R
LGE
3
7
6
x
A
T
X
D
/
R
X
D
:
5V
D
ig
it
a
l
C
O
M
P
1
_
Y/
Pb
/
P
r
:
1/
0.
7V
p
p
C
O
M
P
2
_
Y/
Pb
/
P
r
:
1/
0.
7V
p
p
IR
HD
M
I_
D
A
T
A
_
1
HD
M
I_
D
A
T
A
_
2
D
DC_
S
C
L
2
S
D
A
2
M
E
M
C
_
R
XE2
±
M
E
M
C
_
R
XE4
±
ME
MC
_
R
X
C
3
±
ME
MC
_
R
X
C
±
M
E
M
C
_
R
XE1
±
M
E
M
C
_
R
XE0
±
TV
_
M
A
IN
MA
IN
_
S
I
F
CO
M
P
1
_
Y
/
P
b
/
P
r
:
1/
0.
7V
p
p
AV
1
_
V
IN
PC
_
A
u
d
io
_
L
/
R
CO
M
P
1
_
L
IN
/
R
IN
L_
C
H
R_C
H
FR
CL
VDS
con
nec
tor
TV
_
M
A
IN
M
_
SC
L
/
SD
A
MAI
N
_
S
IF
AV
1
_
L
IN
/
R
IN
MNT
_
L/
R
O
U
T
AV
1
MNT
_
O
U
T
Co
m
p
2
_
L
/
R
:
500m
V
rm
s
CO
M
P
2
_
Y
/
P
b
/
P
r
:
1/
0.
7V
p
p
CO
M
P
2
_
L
IN
/
R
IN
COM
P
2
ME
M
C
_
R
X
O
2
±
ME
M
C
_
R
X
O
4
±
ME
M
C
_
R
X
O
3
±
ME
M
C
_
R
X
O
C
±
ME
MC
_
R
X
O
1
±
ME
MC
_
R
X
O
0
±
P
C
_
R
/G
/B
/H
S
/
V
S
D
DC_
S
C
L
1
/
S
DA
1
D
S
UB
_
S
CL
/
S
DA
MNT
_
V
O
U
T
AV
2
_
V
IN
AV
2
_
L
IN
/
R
IN
IIS
_
O
U
T
US
B
US
B
_
D
P
/
D
N
A
UDI
O
AMP
DD
C_
S
C
L
3
/
S
DA
3
DD
C_
S
C
L
3
/
S
DA
3
EE
P
R
O
M
24C
02
HD
M
I_
D
A
T
A
_
3
TM
D
S
TM
D
S
TM
D
S
HDM
I3
EE
P
R
O
M
(256K
)
Se
ri
a
l F
la
s
h
(8
M
B
y
te
)
EE
P
R
O
M
24C
02
FU
LL
HD
LVD
Sc
onn
ecto
r
FR
C
I
C
L
G
E
7329A
UR
S
A
_
[
C
~
D
]
UR
S
A
_
[
A
:B
]
OP
C_
E
N
D
D
R2
S
D
RA
M
(2ea
*
256M
B
)
R
ear
I
n
p
u
t
S
ide
I
n
pu
t
LI
P
S
RL
_O
N
/
I-D
IM
M
IN
G
/
D
ISP_
E
N
PA
N
E
L
_
S
T
A
T
U
S
E-
D
IM
OP
C_
O
U
T
1
/
2
EE
P
R
O
M
fo
r H
D
C
P
(8K
)
Se
ri
a
l F
la
s
h
EE
P
R
O
M
24C
02
E
E
P
_
SC
L
/
SD
A
E
E
P_
SC
L
/
S
D
A
M_
S
C
L/
S
D
A
- 18 -
300
200
122
120
121
510
500
310
800
801
802
804
803
810
540
900
530
550
521
400
A2
A10
200T
200N
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
CAT24C02WI-GT3
IC100
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
DDC_WP
DSUB_SCL
4.7K
R129
100
R119
4.7K
R128
100
R123
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.
4.7K
R154
R EA
D Y
+5VST_MST
DSUB_SDA
0.01uF
C113
100
R120
10K
R133
0
NON_HOTEL_OPT
R124
30V
D114
ESD_READY
PC_R
PC_AUD_L
220K
R100
75
R107
PEJ024-01
JK102
6B
T_TERMINAL2
8
SHIELD_PLATE
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
75
R126
30V ESD_READY
D104
75
R127
75
R108
6630TGA004K
KCN-DS-1-0089
JK104
1
RED
2
GREEN
3
BLUE
4
GND_1
5
DDC_GND
6
RED_GND
7
GREEN_GND
8
BLUE_GND
9
NC
10
SYNC_GND
11
GND_2
12
DDC_DATA
13
H_SYNC
14
V_SYNC
15
DDC_CLOCK
16
SHILED
12K
R137
COMP2_R
MNT_LOUT
10K
R132
220K
R121
CVBS_RIN
SD05
ESD_READY
ZD201
10uF
16V
C106
SD05
ESD_READY
ZD108
PC_B
100uF
16
V
C103
ENKMC2837-T112
D127
A
A C
C
COMP1_PR
MNT_VOUT
MNT_ROUT
CDS3C30GTH
30V
D120
ESD_READY
SD05
ESD_READY
ZD109
CVBS_VIN
PC_G
SD05 ESD_READY
ZD100
12K
R136
CVBS_LIN
30V
D101
ESD_READY
ENKMC2837-T112
D128
A
A C
C
DSUB_SDA
COMP2_L
SD05
ESD_READY
ZD106
30V
D115
ESD_READY
75
R125
SD05
ESD_READY
ZD200
30V
D203
ESD_READY
220K
R122
COMP2_Y
10K
R113
SD05
ESD_READY
ZD105
SD05
ESD_READY
ZD102
75
R210
SD05
ESD_READY
ZD103
75
R109
CDS3C30GTH
30V
D110
ESD_READY
COMP1_Y
10uF
16V
C105
RT1C3904-T112
Q201
E
B
C
SD05
ESD_READY
ZD104
COMP2_PB
30V
CDS3C30GTH
D100
ESD_READY
RT1C3904-T112
Q200
E
B
C
MUTE_LINE
SD05
ESD_READY
ZD107
CDS3C30GTH
30V
D107
ESD_READY
SD05 ESD_READY
ZD101
ENKMC2837-T112
D126
A
A C
C
PC_AUD_R
30V
D201
ESD_READY
COMP1_L
12K
R118
COMP1_PB
100pF READY
C104
10K
R114
12K
R117
30V
D204
ESD_READY
220K
R104
+5V_MULTI
COMP1_R
COMP2_PR
DSUB_SCL
CDS3C30GTH
30V
D119
ESD_READY
PPJ225-01
JK101
9J
[GN]E-LUG
4A
[GN]O-SPRING-S
3A
[GN]CONTACT-S
9K
[BL]E-LUG
8B
[BL]C-LUG-S
9L
[RD]E-LUG_1
8C
[RD]C-LUG-S
9M
[WH]E-LUG_1
8D
[WH]C-LUG-S_1
9N
[RD]E-LUG_2
4E
[RD]O-SPRING-S_1
3E
[RD]CONTACT-S_1
9P
[YL]E-LUG
4F
[YL]O-SPRING-S
3F
[YL]CONTACT-S
9Q
[WH]E-LUG_2
8G
[WH]C-LUG-S_2
9R
[RD]E-LUG_3
4H
[RD]O-SPRING-S_2
3H
[RD]CONTACT-S_2
5J
[GN]O-SPRING-L
6J
[GN]CONTACT-L
7K
[BL]C-LUG-L
7L
[RD]C-LUG_L
7M
[WH]C-LUG-L_1
5N
[RD]O-SPRING-L_1
6N
[RD]CONTACT-L_1
5P
[YL]O-SPRING-L
6P
[YL]CONTACT-L
7Q
[WH]C-LUG-L_2
5R
[RD]O-SPRING-L_2
6R
[RD]CONTACT-L_2
30V READY
D103
SIDE_Y
30V READY
D102
SIDE_C
S_VIDEO_DET
SD05 READY
ZD110
SD05 READY
ZD111
+3.3V_MULTI_MST
PSJ014-01
JK105
READY
GND
6
1
C-LUG1
2
C-LUG2
3
0-SPRING
4
C-LUG3
5
C-LUG4
SHIELD
7
220K
R130
220K
R131
10K
R138
10K
R139
12K
R141
12K
R140
0.1uF
C117
0.1uF
C119
0.1uF
C118
4.7K
R111
4.7K
R112
75
R106
75
R105
10K
R115
0.1uF READY
C101
10K
R215
10K
R217
12K
R219
12K
R218
220K
R211
220K
R214
75
R212
68pF
C100
68pF
C102
PC_VS
68
R110
PC_HS
68
R116
JP101
JP102
JP103
JP100
JP105
JP106
JP104
MDS61887701
M1
GAS1
MDS61887701
M2
GAS2
MDS61887701
M3
GAS3
10uF
16V
C10000
READY
100pF READY
C10001
0
R142
RT1C3904-T112
Q100
E
B
C
0
R143
RT1C3904-T112
Q101
E
B
C
200
R134
200
R135
75
R101
75
R103
75
R102
EAX58017401 Mstar LCD LH50
PC EDID
AV1
COMPONENT1
PC
**MULTI ITEM
1.24C02-SUB:0IMMRAL014D
2.ENKMC2837-SUB:0DS226009AA [KDS226]
POP NOISE
PC SOUND
POP NOISE
COMPONENT1/2, AV1, MNT_OUT[JACK PACK TYPE C
COMPONENT2
MNT_OUT
INPUT-ANALOG/PC
H6 LH50
9 12
2008/12/23
S-VIDEO(China)
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.
SIDE_RIN
SIDE_LIN
PPJ218-01
JK201
5C
[RD]CONTACT
2C
[RD]U_CAN
4C
[RD]O_SPRING
2B
[WH]U_CAN
3B
[WH]C_LUG
2A
[YL]U_CAN
5A
[YL]CONTACT
4A
[YL]O_SPRING
5.6B
ZD202
READY
SIDE_V
5.6B
ZD203
READY
CDS3C30GTH 30V
D121
ESD_READY
IR_OUT
RXD
ST3232CDR
IC101
3
C1-
2
V+
4
C2+
1
C1+
6
V-
5
C2-
7
T2OUT
8
R2IN
9
R2OUT
10
T2IN
11
T1IN
12
R1OUT
13
R1IN
14
T1OUT
15
GND
16
VCC
TXD
CDS3C30GTH 30V
D122
ESD_READY
+3.3V_MST
KCN-DS-1-0088
JK103
1
2
3
4
5
6
7
8
9
10
+3.3V_MST
USB DOWN STREAM
KJA-UB-4-0004
P200
1
2
3
4
5
USB_DP
USB_DN
30V
D205
READY
30V
D206
READY
0.1uF
C109
0.1uF
C107
0.1uF
C108
0.1uF
C205
100
R145
100
R144
4.7K
R206
4.7K
R207
0
R200
0
R201
0
Non_OCP
R202
+5V_USB
500
L200
10uF
6.3V
C201
120OHM OCP
L202
4.7K OCP
R205
1K
OCP
R204
MIC2009YM6-TR
OCP
IC201
3
ENABLE
2
GND
4
FAULT/
1
VIN
6
VOUT
5
ILIMIT
0.1uF OCP
C203
10uF OCP
C204
30V
D208
30V
D207
JP201
JP200
JP202
220uF 16V
C200
100uF
16V
C202
KDS226
OCP
D200
A
AC
C
510 OCP
R208
160
O
CP
R203
75
R227
220K
R223
READY
220K
R222
READY
10K
R224
10K
R225
12K
R226
12K
R228
IR_OUT
**1A Design
Its possibel to 27~47ohm
SIDE AV
USB
EAX58017401 Mstar LCD LH50
RS-232C (CI ITEM)
INPUT-RS232/SIDE/USB
H6 LH50
2 12
2008/12/23
EAN43439401
Pin to Pin with
Close to SIDE_USB
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