DOWNLOAD LG 22LN4000 (CHASSIS:LM91N) Service Manual ↓ Size: 5.41 MB | Pages: 27 in PDF or view online for FREE

Model
22LN4000 (CHASSIS:LM91N)
Pages
27
Size
5.41 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
22ln4000-chassis-lm91n.pdf
Date
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LG 22LN4000 (CHASSIS:LM91N) Service Manual ▷ View online

- 16 -
7. Abnormal sound (TV)-Main PCBA
wœ›G•›–GymG Šˆ‰“ŒGŠ–”—“Œ›Œ“ f
Abnormal sound (TV)
YES
NO
NO
insult RF cable tight and then 
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
pšG\}Gˆ›G\—•G–G {|[WXf
If 4.9V is not at plus pin of L706, check 
It is over 3V at 2pin of IC706, 
if it is not, Check Line between IC706 
and IC600  is open or short.
Another is change IC706
2
pšGpYjG žˆŒ–™”G
h›G]S^—•G –G {|[WXf
3
Check Line between TU401  and IC600
is open or short,  Another is change 
IC600 or TU401
4
pšGpmG žˆŒ–™”G ˆ›G]^
S]_G—•G–G pj]WWf
Check Line between TU401  and IC600
is open or short,  Another is change 
IC600 or TU401
NO
NO
3
^w•G–G {|[WXG OzjsP
]w•G–G {|[WXG OzkhP
4
]^S]_G —•G–G pj]W[
- 17 -
8. Abnormal sound (AV)-Main PCBA
wœ›G•›–Gh}GŠˆ‰“ŒGŠ–”—“Œ›Œ“ f
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC600
WAVEFORMS
pšGžˆŒ–™”G ˆ›Gj]__Sj]_`
2
Check Line between JK101 and IC600
is open or short,  Another is 
change AV cable
NO
YES
j]__Sj]_`G Oˆœ‹–G•P
2
- 18 -
19
V
19
V
_am
p
D
C
/D
C
3.
3V
 S
tan
d 
by
5v
_t
un
er
19
V
_a
m
p
3.
3V
S
ta
nd
by
5v
_t
un
er
`
TM
D
S
/H
D
M
I R
X
V
IF
 D
e-
m
od
e
D
ec
od
er
sa
w 
fil
te
r
A
D
C
A
ud
io
 
pr
oc
es
so
r
S
ca
lar
V
id
eo
pr
oc
es
so
r
LV
D
S 
TX
S
ys
te
m
E
E
P
R
O
M
A
D
C
S
pe
ake
r
A
m
p(
5W
)
LC
D
m
od
ul
e
Fl
as
h
vi
de
o
A
D
C
au
di
o
sa
w 
fil
te
r
O
S
D
/L
U
T
C
ry
sta
l
IR
LE
D
To
uc
h 
S
IF
 D
e-
m
od
e
LD
O
2.
5v
_S
D
R
M
C
U
64
M
 S
D
R
A
M
C
V
B
S
R
F
3.
3v
_A
V
C
C
1.
1V
_V
C
C
K
1.
25
v_
AV
D
D
LV
D
S
13
66
X
76
8 
60
hz
76
M
hz
24
M
hz
M
T8
22
3L
D
C
/D
C
D
C
/D
C
D
C
/D
C
LD
O
A
da
pte
r
B
JT
12
v_
m
od
ul
e 
B
ur
st 
up
(2
2”
)
24
V
BLOCK DIAGRAM
- 19 -
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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