LG 42LS341C / 42LS3450 (CHASSIS:LJ21C) Service Manual ▷ View online
- 21 -
No Raster On AV Video Signal
No Signal On TV(RF) Signal
Check Input source
Cable And Jack
Pass
Check Input source
Cable And Jack
Pass
Check The Input/Output
Of JK1601
Pass
Re-soldering or
Change the defect part
Pass
Fail
Pass
Repeat [A], & [B] Process
Check the Input/Output
Of IC101
Fail
Re-soldering or
Change the defect part
Pass
Check The Input/Output
Of TU3703
Pass
Re-soldering or
Change the defect part
Pass
Fail
Check the Input/Output
Of IC101
Fail
Re-soldering or
Change the defect part
Repeat [A], & [B] Process
- 22 -
No Sound
Check The Input Sourse
Check The Input/Output
Of IC501
Re-soldering or
Change the defect part
Fail
Pass
Pass
Check The Speaker
Change Speaker
Fail
Check The Speaker Wire
Pass
Change The Source Input
Fail
- 23 -
BLOCK DIAGRAM
Et
he
rne
t
R
G
B
P
C
S
P
D
IF
Co
m
po
ne
nt
2
H
D
MI
1
/2
(D
V
I)
TD
S
N
TD
S
N
-
-
B
0
0
1
F
B
0
0
1
F
P
C/
D
V
I A
ud
i I
n
IF
+
/-
TU
_C
VB
S
SI
F
L/
R
LG
E2
11
2-
T8
IC
1
0
1
LG
E2
11
2-
T8
IC
1
0
1
S
ER
IA
L F
LA
S
H
IC
1
4
0
1
(
8
M
b
it
)
M
X
2
5
L8
0
0
5
M
2
I
LV
D
S
(F
H
D
/5
0
H
z)
A
ud
io
A
MP
N
TP
7
5
0
0
U
S
B
1
D
P/
D
M
S
P
K
L
/R
X
-t
al
2
4
M
FP
C
(5
1
P
)
I2
S
SP
D
IF
RG
B,
H
/V
SY
N
C
R
ea
r
D
D
C/
D
[0
:2
]/
C
K/
H
PD
D
D
R3
A
dd
.
D
D
R3
D
at
a
SP
I
Si
de
N
A
N
D
F
LA
S
H
IC
1
0
2
(
1
G
b
it
)
TM
D
S
H
D
MI
3
D
D
R
3
1
G
b
IC
1
2
0
2
H
5
TQ
1
G
6
3D
FR
D
D
R
3
1
G
b
IC
1
2
0
1
H
5
TQ
1
G
6
3D
FR
C
O
N
TR
O
L
IR
&
L
ED
/
S
O
FT
T
O
U
C
H
(T
A
C
T
S
W
IT
C
H
)
S
E
N
S
O
R
_S
C
L
/S
D
A
L
E
D
_R
K
E
Y
1
K
E
Y
2
IR
S
O
F
T
T
O
U
C
H
_S
C
L
/S
D
A
EEPR
O
M
A
T2
4C
25
6C
-S
SH
L-
T
IC
1
0
4
25
6
K
bi
t
I2
C
EP
H
Y
Co
m
po
ne
nt
1
&
A
V
Y/
Pb
/P
r,
L
/R
CV
BS
,
Y/
Pb
/P
r,
L
/R
TU
_S
W
- 24 -
A2
A10
A9
90
0
30
0
20
0
40
0
54
0
52
1
53
0
51
0
91
0
12
0
12
3
50
1
12
2
50
0
LV
1
* Set + Stand
* Stand Base + Body
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.
IMPORTANT SAFETY NOTICE
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