Read LG 42LH50YR (CHASSIS:LP91B) Service Manual 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
DR
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
al
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
CL
2
S
DA
2
M
EM
C
_
R
XE2
±
M
EM
C
_
R
XE4
±
ME
MC
_
R
X
C
3
±
ME
MC
_
R
X
C
±
M
EM
C
_
R
XE1
±
M
EM
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
CLVD
Sc
onne
ctor
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
CL
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
_
OU
T
US
B
US
B
_
D
P
/
D
N
A
UDI
O
AMP
DD
C_
S
CL
3
/
S
DA
3
DD
C_
S
CL
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
ector
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
ut
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
EP
_
SC
L
/
SD
A
E
E
P_
SC
L
/
S
D
A
M_
S
C
L/
S
D
A
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