DOWNLOAD LG 22LN4050 (CHASSIS:LB35A) Service Manual ↓ Size: 5.32 MB | Pages: 33 in PDF or view online for FREE

Model
22LN4050 (CHASSIS:LB35A)
Pages
33
Size
5.32 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
22ln4050-chassis-lb35a.pdf
Date

LG 22LN4050 (CHASSIS:LB35A) Service Manual ▷ View online

- 21 -
9. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2
Check Line between JK101 and IC501
is open or short,  Another is 
change AV cable
NO
YES
C520,C521(audio  in)
2
- 22 -
10. Abnormal sound  (HDMI)-Main PCBA
Abnormal sound (HDMI)
Put into HDMI 
cable completely?
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing 
and format in spec?
Change Timing according to 
product spec, change format
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK204?
3
Check Line between JK204 and IC501
is open or short,  Another is 
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK204?
YES
4
Check Line between JK204 and IC501
is open or short,  Another is 
Change HDMI cable
NO
Can read EDID  and 
HDCP key though
16,15pin of JK204
Check Line between JK204 and IC501
is open or short,  Another is 
Change  HDMI cable
YES
Is 5V at 19pin of JK204?
Check Line between JK204 and IC501
is open or short,  Another is 
Change IC501  or HDMI cable
5
YES
6
- 23 -
Ad
ap
to
r
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ou
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 A
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TP
75
13
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68
41
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5
9
4
3
10
11
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r SD
A
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40
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98
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44
43
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5
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5
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3
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24
C
64
30
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F
33
18
21
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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
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A
ud
io
_S
D
A
LV
D
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im
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. O
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3.
5V
M
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V
TU
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V
19V
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+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
SD
A
EE
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
- 24 -
A2
A31
900
200
400
540
910
120
122
300
510
502
51
1
501
800
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
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