LG 19LN4050 (CHASSIS:LB35A) Service Manual ▷ View online
- 17 -
8. Abnormal sound (AV)-Main PCBA
wGGh}GG f
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
pGG Gj\YWSj\YX
2
Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
j\YWSj\YXOG P
2
- 18 -
Ad
ap
to
r
S
ou
nd
A
M
P
N
TP
75
13
(
(
(
(
Mo
du
le
Au
di
o
O
ut
M
ST
68
41
XP
5
9
4
3
10
11
Tu
ne
r SD
A
Tu
ne
r SC
L
TU
N
E
R
IF
_A
G
C
B+
IR
/K
EY
40
24
M
hz
98
99
44
43
IC
5
0
2
Se
ria
l F
la
sh
8M
by
te
s
IC
5
0
3
EE
PR
O
M
24
C
64
30
LP
F
33
18
21
O
P-
A
M
P
x4
G
ai
n
Aud
io
L-O
ut
X
X
X
39
37
38
Aud
io
R-O
ut
H
D
M
I
SC
L/
SD
A
48
115
50
51
113
11
2
A
ud
io
_S
C
L
A
ud
io
_S
D
A
LV
D
S
O
ut
pu
t
P D
im
Inv
. O
N
P
_S
T
3.
5V
M
_3
.3
V
TU
_3
.3
V
19V
M
ai
n_
1.
2V
+1
8V
10
11
7
8
9
38
I2
S_
M
C
LK
I2
S_
W
S
I2
S_
SC
K
I2
S_
SD
O
10
8
11
1
11
7
IR
KEY
1
Led
_PW
R
10
2
105
53
52
45
85
84
EE
P
SD
A
EE
P
SC
L
94
95
97
96
SP
I_
C
LK
SP
I_
D
I
SP
I_
C
Z
SP
I_
D
O
S_
A
M
P_
19
V
32
40
LP
F
U
SB
_5
V
110
KEY
2
ST
_3
.5
V
P_
12
V
Q
71
0
M
ai
n_
1.
8V
M
_3
.3
V
Q
72
0
A
O
34
07
A
Pa
ne
l_
Vc
c
M
ai
n_
5V
To
U
SB
U
SB
_D
N
U
SB
_D
P
IF_
P
IF_
N
31
35
1.
8V
R
EG
7
TU
_1
.8
V
19
20
Aud
io
out
27,35,3
6
22,20,24,
77
62
54
41
30
18
9
116
10
7
10
0
101
Led
_PW
R
D
T1
64
1S
TP
S4
02
10
M
od
ul
e
B
LU
ĝ
ĝ
LE
D
_2
8V
B
LU
_2
4V
M
od
ul
e
B
LU
ĝ
M
P2
00
51
1.
8V
R
EG
M
P1
47
2
M
P1
58
4
M
P1
47
2
+1
8V
Q
71
2
To
O
P_
A
M
P
CVB
S In
AV
aud
io
in
BLOCK DIAGRAM
- 19 -
A2
A31
900
200
400
540
402
401
910
120
122
300
510
502
51
1
501
800
801
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
AP
C
PC
W
M
_4828539
:W
P_GLOBAL_P
FW
P_GLOBAL_PF
APC
PC
WM
_4828539:W
P_G
LO
BAL_
PF
WP
_G
LO
BAL_
PF
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