LG 42CM565 (CHASSIS:LA21B) Service Manual ▷ View online
- 21 -
9. Digital TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner
.
10. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check CVBS Signal
TU3700 8 Pin
Replace IC3703 .
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
- 22 -
11. AV Audio
12. Component Audio
13. RGB Audio
Check AV Cable for damage
for damage or open conductor
Check JK1601 Signal Line
R1632,R1633
ok
ok
No
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
Check Component Cable
for damage or open conductor.
Check JK1601 Signal Line
R1618, R1617
ok
ok
No
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
Check Cable conductors
for damage or open conductor
Check JK1102 & Signal Line
ok
No
ok
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
- 23 -
BLOCK DIAGRAM
R
G
B
P
C
S
P
D
IF
Co
m
po
ne
nt
2 1
H
/P
O
U
T
H
D
MI
(D
V
I)
H
al
f
H
al
f
N
IM
N
IM
(S
I2
1
(S
I2
1
7
6
_
A
T
7
6
_
A
T
SC
_
1
I
SC
_
1
I
N
P
U
T)
N
P
U
T)
P
C A
ud
io
I
n
IF
+
/-
TU
_C
VB
S
SI
F
L/
R
S
7
LR
S
ER
IA
L F
LA
S
H
M
X
IC
(
8
M
b
it
)
M
X
2
5
L8
00
6
EM
2
I
LV
D
S
(F
H
D
/H
D
6
0
z)
A
. A
MP
N
TP
7
5
0
0
U
S
B
2
.0
D
P/
D
M
S
P
K
L
/R
X
-t
al
2
4
M
H
z
FP
C
(5
1
P
/F
H
D
)
I2
S
SP
D
IF
H
/P
L
/R
L/
R
CV
BS
,
Y/
Pb
/P
r,
L
/R
RG
B/
H
/V
R
ea
r
TM
D
S
D
D
R2
A
dd
.
D
D
R2
D
at
a
SP
I
A
V
Si
de
N
A
N
D
F
la
sh
(1
G
b
it
)
N
A
N
D
0
1
G
W
3
B
2
C
N
6
E
PC
M
_A
[0
:7
]
TM
D
S
H
D
MI
CV
BS
,
L/
R
D
D
R
3
2
5
6M
B
1
G
b
H
yn
ic
H
5
TQ
1
G
6
3D
FR
D
D
R
3
2
5
6M
B
(1
G
b)
H
yn
ic
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
)
K
E
Y
1
K
E
Y
2
IR
L
E
D
_B
/L
G
L
O
G
O
A
T2
4
C
1
0
24
B
N
-S
H
-T
1
M
bi
t
I2
C
R
S
-2
3
2
C
FP
C
(3
0
P
/H
D
)
MA
X
3
2
3
2
RS
23
2C
S
E
N
S
O
R
_S
C
L
S
E
N
S
O
R
_S
D
A
LA
N
ET
_RX
/T
X
- 24 -
A2
A4
A1
0
90
0
30
0
20
0
80
0
40
0
54
0
52
1
53
0
81
0
91
0
120
* Set + Stand * Stand Base + Body
LV
1
AG
1
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
Click on the first or last page to see other 42CM565 (CHASSIS:LA21B) service manuals if exist.