Read LG 42LH4900 (CHASSIS:LD91B) Service Manual online
- 14 -
BLOCK DIAGRAM
RG
B
COM
P
ON
E
N
T
COM
P
ON
E
N
T
F-
S
C
A
R
T
AV
3
B
U
F
_
T
S
_C
L
K
/
E
RR/
S
Y
N
/
D
A
T
A
[0
]
AV
_
C
V
B
S
_
IN
DD
R
2
S
D
R
A
M
(1
G
b
)
IC
3
0
0
NA
N
D
F
la
s
h
HY
N
IX
IC
102
US
B
US
B
Di
g
it
a
l am
p
(N
T
P
3100L
)
IC
7
0
1
COM
P
_
Y
/P
b
/
P
r
SC
1
_
C
V
B
S
_
IN
SC
2
_
C
V
B
S
_
I
N
I2
S
DS
U
B
_
R
/
G/
B
Tu ner
( TDFW-G235 D1 )
TU10 00
LC
D
Pa
n
e
l
74LVC541A
Buffer
I C502
I C502
CI Slot
( P5 00 )
74LCX244
Buff er
I C501
I C501
P
C
M_
A[
0
:7]
FE
_
V
MA
IN
P
C
M
_
A
[
0:
7]
SD
D
R
_
D
[
0
:1
5
]
DD
R
2
S
D
R
A
M
(512M
b
)
IC
3
0
1
T
D
D
R
_
D
[
0
:15]
SD
D
R
_
A
[
0
:1
2
]
Ms
ta
r
S
6
L
G
E
3369A
(D
V
IX
)
(I
C
1
00)
M
P
6211D
H
US
B
P
o
w
e
r
IC4
0
2
US
B
P
o
w
e
r
FE
_
T
S
_
D
A
T
A
[
0
:7
]
->
C
I_
M
D
I[
0
:7
]
H-S
C
A
R
T
H-S
C
A
R
T
SC
1
_
R
/
G
/
B
S
C
1/
2_
L
/
R
_
IN
, F
E
_
A
M
_
A
U
D
IO
,
A
V
_
L
/
R
_I
N
, C
O
M
P
_L
/
R
_
IN
, P
C
_
L
/
R
_I
N
FE
_
V
O
U
T
D
T
V/
M
N
T
_
VO
U
T
TD
D
R
_
A
[
0
:1
2
]
T
P
A
6
110A
IC
700
He
a
d
Ph
o
n
e
R
S
-232C
M
A
X
3232
C
D
R
IC
403
SPD
IF
SP
D
IF
_
O
U
T
DS
U
B
_
H
/
V
S
Y
N
C
HP
_
L
/
R
O
U
T
L/
R
CI
_
T
S
_
D
A
T
A
[
0
:
7]
P
C
M
_
D
[
0:
7
]
->
C
I_
D
A
T
A
[
0:
7]
CI
_
A
DD
R
[
0
:7
]
AU
D
IO
I
N
RG
B
_
T
X
/
R
X
H
P
D
1
/2
/
3
/4
,
HDM
I_
C
E
C
H
D
M
I1
/2
/3
T
M
DS
[
0
:7
] (
D
at
a,
C
lo
c
k
(+
/-
))
US
B
_
D
M
/D
P
EE
P
R
O
M
AT
2
4
C
5
1
2
(I
C
1
0
5
)
EEP
R
O
M
A
T
24C
512
(H
D
C
P
)I
C
1
0
7
I2
C
LV
D
S
(
1
0
b
it
)
S
e
ri
al
F
las
h
IC
1
0
4
Fo
r T
ri
to
n
S
e
ri
al
F
las
h
IC
103
Fo
r B
o
o
t
K
IA
7027
(I
C
1
0
1
)
Vo
lt
a
g
e
D
e
te
c
to
r
74L
X
1
G
14C
(I
C
108)
Sc
h
m
it
t Tr
ig
g
e
r
Reset
5V
_
H
D
M
I_
1/
2/
3/
4
HDM
I
1/
2/
3/
4
FR
C
LGE
7
3
2
9
A
IC9
0
0
4C
h
L
V
D
S
(
1
0
b
it
)
D
D
R2
S
D
RA
M
(5
1
2
M
b
)
IC
1001
D
D
R2
S
D
RA
M
(5
1
2
M
b
)
IC
1000
DD
R
_
A
_
D[
0
:1
5
]
D
D
R
_
B
_
D
[
16:
3
1]
D
D
R
_
A
_
A
[
0:
12]
DD
R
_
B
_
A
[
0
:1
2
]
HD
M
I
S
/
W
(T
M
D
S
3
5
1
)
IC
6
0
3
H
D
M
I4
T
M
D
S
[
0
:7
]
(
D
a
ta
, C
lo
c
k (
+
/-
)
)
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