LG 39LN5400 / 39LN542Y (CHASSIS:LB36B) Service Manual ▷ View online
- 17 -
8. Digital/Analog TV Audio
9. AV Audio
10. Component Audio
Check RF Cable & Signal
Follow procedure ‘7. 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 AV Cable for damage
for damage or open conductor
Check JK1702 Signal Line
R1714,R1715
ok
ok
No
Replace Jack
Follow procedure
‘7. All source audio ’
trouble shooting guide.
Check AV Cable for damage
for damage or open conductor
Check JK1702 Signal Line
R1714,R1715
ok
ok
No
Replace Jack
Follow procedure
‘7. All source audio ’
trouble shooting guide.
- 18 -
Tu
ne
r
(T
U
3702)
AV
C
om
po
nen
t
(J
K
1702
)
H
EA
D
_P
H
O
N
E
(J
K
1500
)
M
ai
n
SO
C
S
7L
R
_M
1
(M
D
S
80
4K
K
X
)
(IC
10
1)
SI
D
E
R
EA
R
U
SB
(J
K
700)
H
D
M
I1
(J
K
801)
(P
11
01
)
30P
HD
LV
DS
waf
er
51P
F
HD
LV
DS
waf
er
(P
11
00
)
TU
_SC
L
/ SD
A
IF
_P/
N
_M
ST
AR
, T
U
_C
VB
S,
T
U
_S
IF
AV
2_C
VB
S_
IN
AV
2_R
/L
_I
N
C
O
M
P2_Y
+,
A
V_C
VB
S_
IN
C
O
M
P2_R
/L
_I
N
, C
O
M
P2_P
r+
/P
b+
, A
V_C
VB
S_
D
ET
H
P_L
OU
T/
R
O
U
T
C
K
+/
-,
D
0+
/-,
D
1+
/-,
D
2+
/-_H
D
M
I2
D
D
C
_SC
L/
SD
A_2
H
D
M
I_
SI
D
E
(M
H
L)
(J
K
803)
C
K
+/
-,
D
0+
/-,
D
1+
/-,
D
2+
/-_H
D
M
I4,
M
H
L_
C
D
_SEN
SE
D
D
C
_SC
L/
SD
A_4
SI
D
E_U
SB
1_
D
M
/D
P
Sy
st
em
E
EP
R
O
M
(2
56
K
bi
t)
IC
10
4
N
A
N
D
F
LA
SH
(1
G
bi
t)
IC
10
2
D
D
R
3
SD
R
A
M
(2
G
bi
t)
IC
12
01
Se
ria
l F
la
sh
(8
M
bi
t)
IC
13
00
SP
I_
SC
K
/SD
I/SD
O/
C
S
I2
C
_SC
L/
SD
A
PC
M
_A
[0-7]
,…
A-
M
D
QL
[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
+/
-
R
XB
0+
/-~
R
XB
4+
/ -,
R
XB
C
K
+/
-
SP
K
_R
SP
K
_L
8P co
nn
ec
to
r
P6
00
K
EY1
/2
, L
ED
_R
/B
U
ZZ
,
IR
AM
P_SC
L/
SD
A
AU
D
_M
AST
ER
_C
LK
,
AU
D
_L
R
C
H
,
AU
D
_L
R
C
K
,
AU
D
_SC
K
ST
A
38
0
(IC
34
01
)
O
C
P
IC
(IC
80
2)
VB
U
S_E
N
C
AV
C
om
po
nen
t
(J
K
1701
)
U
SB
1_O
C
D
/C
T
L
D
C
D
C
+
O
C
P
IC
(IC
40
1)
+5
V_
U
SB
5V_H
D
M
I_4
H
PD
4/
C
VU
S
H
PD
2
AV
D
D
5V_M
H
L
BLOCK DIAGRAM
■ ERRC
- 19 -
Tu
ne
r
(T
U
37
02
)
AV
C
om
po
ne
nt
(J
K
17
02
)
H
E
AD
_P
H
O
N
E
(J
K
15
00
)
M
ai
n
SO
C
S7
LR
_M
1
(M
D
S8
04
KK
X
)
(IC
10
1)
S
ID
E
R
E
A
R
U
SB
(J
K
70
0)
H
D
M
I1
(J
K
80
1)
(P
11
01
)
30P
H
D L
VD
S w
afe
r
51P
F
HD
LV
DS
waf
er
(P
11
00
)
TU
_S
C
L
/ S
D
A
IF
_P
/N
_M
ST
AR
, T
U
_C
VB
S,
T
U
_S
IF
AV
2_
C
VB
S_
IN
AV
2_
R
/L
_I
N
C
O
M
P
2_
Y+
, A
V_
C
VB
S_
IN
C
O
M
P
2_
R
/L
_I
N
, C
O
M
P
2_
P
r+
/P
b+
, A
V_
C
VB
S_
D
E
T
SP
D
IF
_O
U
T
H
P
_L
O
U
T/
R
O
U
T
C
K
+/
-,
D
0+
/
-,
D
1+
/
-,
D
2+
/
-_
H
D
M
I2
D
D
C
_S
C
L/
SD
A_
2
H
D
M
I_
SI
D
E
(M
H
L)
(J
K
80
3)
C
K
+/
-,
D
0+
/
-,
D
1+
/
-,
D
2+
/
-_
H
D
M
I4
,
M
H
L_
C
D
_S
E
N
SE
D
D
C
_S
C
L/
SD
A_
4
SI
D
E
_U
SB
1_
D
M
/D
P
SP
D
IF
(O
pt
ic
)
(J
K
10
01
)
Sy
st
em
E
E
P
R
O
M
(2
56
Kb
it)
IC
10
4
N
A
N
D
F
LA
SH
(1
G
bi
t)
IC
10
2
D
D
R
3
SD
R
A
M
(1
G
bi
t X
2
E
A
)
IC
12
01
/
IC
12
02
Se
ria
l F
la
sh
(8
M
bi
t)
IC
13
00
SP
I_
SC
K
/S
D
I/S
D
O
/C
S
I2
C
_S
C
L/
SD
A
P
C
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
X
A0
+/
-~
R
X
A4
+/
-,
R
X
AC
K
+/
-
R
X
B
0+
/-
~R
X
B
4+
/-
,
R
X
B
C
K
+/
-
SP
K_
R
SP
K_
L
8P co
nn
ec
to
r
P
60
0
K
E
Y1
/2
, L
E
D
_R
/B
U
Z
Z
, I
R
AM
P
_S
C
L/
SD
A
AU
D
_M
AS
TE
R
_C
LK
,
AU
D
_L
R
C
H
,
AU
D
_L
R
C
K
,
AU
D
_S
C
K
ST
A
38
0
(IC
34
01
)
O
C
P
IC
(IC
80
2)
VB
U
S_
E
N
C
AV
C
om
po
ne
nt
(J
K
17
01
)
U
SB
1_
O
C
D
/C
TL
D
C
D
C
+
O
C
P
IC
(IC
40
1)
+5
V_
U
SB
5V
_H
D
M
I_
4
H
P
D
4/
C
VU
S
H
P
D
2
AV
D
D
5V
_M
H
L
■ Non ERRC
- 20 -
A2
A9
A10
900
200
400
540
521
530
500
910
120
300
510
123
122
Set + Stand
Stand Base
+
Stand Body
LV
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 39LN5400 / 39LN542Y (CHASSIS:LB36B) service manuals if exist.