LG 42CS560 / 42CS560Y (CHASSIS:LB21B) 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
.
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 SIF Signal
TU3700 6 Pin
Replace IC3703 .
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner
.
10. Analog TV Audio
- 22 -
11. AV 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.
12. Component Audio
Check Component Cable
for damage or open conductor.
Check JK1601 & Signal Line
R1632, R1633, R1617, R1618
ok
ok
No
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
13. RGB Audio
Check Cable conductors
for damage or open conductor
Check JK1102 & Signal Line
R1107, R1108
ok
No
ok
Replace Jack
Follow procedure
‘8. All source audio’
trouble shooting guide.
- 23 -
R
G
B
-P
C
(J
K
11
04
)
Tu
ne
r
(T
U
37
04
)
C
om
po
ne
nt
1
&
A
V
C
om
po
ne
nt
2
(J
K
16
01
)
PC
-A
U
D
IO
(J
K
11
02
)
Main SO
C
S7
LR
(L
G
E2
11
1A
)
(IC
10
1)
SIDE
RE
A
R
U
SB
(J
K
14
50
)
HDMI1 (J
K
80
1)
HDMI2 (J
K
80
2)
(P
70
5)
30P
H
D L
VD
S w
afe
r
51P
F
HD
LV
DS
waf
er
(P
70
3)
(P
70
5)
(P
70
3)
TU
_S
C
L
/ S
D
A
IF
_P
/N
_M
ST
A
R
, T
U
_C
VB
S,
T
U
_S
IF
SC1/COMP1_L/R_I
N
C
O
M
P1
_Y
+/
Pb
+/
Pr
+
C
O
M
P2
_L
/R
_I
N
C
O
M
P2
_Y
+/
Pb
+/
Pr
+,
A
V_
C
VB
S_
IN
Et
he
rn
et
(J
K
21
00
)
SP
D
IF
_O
U
T
PC
_L
/R
_I
N
D
SU
B
_R+/G
+/
B
+,
D
SU
B
_H
/V
SY
N
C
C
K
+/
-, D0
+/
-,
D
1+
/-,
D
2+
/-,
D
3+
/-_
H
D
M
I2
C
K
+/
-, D0
+/
-,
D
1+
/-,
D
2+
/-,
D
3+
/-_
H
D
M
I1
D
D
C
_S
CL/SDA
_1
D
D
C
_S
CL/SDA
_2
HDMI3 (J
K
80
3)
C
K
+/
-, D0
+/
-,
D
1+
/-,
D
2+
/-,
D
3+
/-_
H
D
M
I4
D
D
C
_S
CL/SDA
_4
SI
D
E_
U
SB
_D
M
/D
P
U
SB
1_
O
C
D
/C
TL
EP
H
Y_
R
P/
N
, E
PH
Y_
TP
/N
O
C
P
IC
:
AP
21
91
D
SG
(IC
14
50
)
+5
V_
U
SB
1
SP
D
IF
(O
pt
ic
)
(J
K
11
03
)
Sy
st
em
E
EP
R
O
M
(2
56
K
bi
t)
IC104IC104
IC102
N
AN
D
F
LA
SH
(1Gbit
)
IC102
IC
12
01
, I
C
12
02
D
D
R
3
SD
R
AM
(1Gbit
)
IC
12
01
, I
C
12
02
Serial Flas
h
(8
M
bi
t)
IC
14
01
IC
14
01
SP
I_
SC
K
/S
D
I/S
D
O
/C
S
I2
C
_S
C
L/
SD
A
PC
M
_A
[0
-7
],…
A
-M
D
Q
L[
0-
7]
, A
-M
D
Q
U
[0
-7
],…
B
-M
D
Q
L[
0-
7]
, B
-M
D
Q
U
[0
-7
],…
R
XA
0+
/-~
R
XA
4+
/-,
R
XA
C
K
+/
-
RXB0+/-~RXB4
+/
-,
R
XB
C
K
+/
-
SP
K
_R
SP
K
_L
10
P
co
nn
ec
to
r
P2
40
1
10
P
co
nn
ec
to
r
P2
40
1
SE
N
SO
R
_S
C
L/
SD
A
,
K
EY
1/
2,
L
ED
_B
, I
R
A
M
P_
SC
L/
SD
A
A
U
D
_M
A
ST
ER
_C
LK
,
A
U
D
_L
R
C
H
,
A
U
D
_L
R
C
K
, A
U
D
_S
C
K
N
TP
-7
50
0L
(IC
50
1)
Sy
st
em
E
EP
R
O
M
BLOCK DIAGRAM
- 24 -
A5
A2
A21
A4
A10
900
300
200
800
400
540
521
530
810
910
120
51
1
510
* Set + Stand * Stand Base + Body
LV1
820
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 42CS560 / 42CS560Y (CHASSIS:LB21B) service manuals if exist.