LG RT-21FD90VQ, Service Manual

Page: 19 / 30

BLOCK DIAGRAM
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M
IC
O
M
(
IC
1
1
)
V
C
T
4
9
*
*
T
U
N
E
R
(T
U
1
0
1
)
A
V
-O
U
T
(J
K
2
0
2
)
*
S
C
A
R
T
/
P
H
O
N
E
/
D
V
D
F
B
T
(T
4
0
2
)
A
U
D
IO
A
M
P
(
IC
6
0
1
)
R
G
B
A
M
P
(
T
D
A
6
1
0
7
Q
)
S
T
R
-W
6
7
5
4
(I
C
8
0
1
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A
U
D
IO
-O
U
T
R
G
B
H
V
S
C
R
E
E
N
H
/
T
H
-D
R
IV
E
(
Q
4
0
1
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V
E
R
T
IC
A
L
A
M
P
(I
C
3
0
1
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T
D
A
4
8
6
3
A
1
4
V
-1
4V
V
A
H
-O
U
T
3
5V
(H
-V
c
c
/ T
U
-3
3
V
)
S
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c
c
6
.5
V
1
2V
B
+
S
A
W
F
IL
T
E
R
(Z
1
0
1
)
P
IP
_
B
O
A
R
D
(
S
D
A
9
4
8
9
X
)
S
1
1
1
7-1
8
(I
C
8
2
5
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S
1
1
1
7-
3
3
(I
C
8
5
3
)
K
IA
7
8
S
0
6
P
(I
C
8
2
4
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K
A
7
8
R
3
3
K
A
7
8
R
0
5
C
S
T
-5
V
S
T
-3
.3
V
S
T
-1
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V
3
.3
V
G
A
M
E
H
IC
(H
IC
0
1
)
1
9
0V
V
B
H
-F
L
B
II
C
3
3V
5
V
TV / MONITOR OUT
SCART RGB-IN
Y/Cb/Cr-IN
AV-IN
H
-V
c
c
5
V
S
-V
c
c
PIP-RGB
PIP-VIDEO
IIC
VS
H
-F
L
B
5
V
S
T
-5
V
ON / OFF
DATA/CLOCK
RESET
VIDEO/AUDIO
1
9
0
V