LG 22LF15R (CHASSIS:LP81K) Service Manual ▷ View online
- 17 -
7. No sound
Check the input
Source.
Fail
Pass
Change the source input.
Check input/Output
of IC100.
Fail
Pass
Re-soldering of Change the defect part.
Check the X100
Check the X100
Check the input/
output of IC500
Fail
Re-soldering or Change
the defect part.
the defect part.
Pass
Check the Speaker
Pass
Check the Speaker wire.
Fail
Change Speaker.
- 18 -
L
V
DS
M
O
DU
L
E
TT
L
M
O
D
U
L
E
M
X
25L
1605A
M
2
C
(S
er
ia
l F
la
s
h)
Co
n
tr
o
l B
o
a
rd
(T
a
c
t
S
w
it
c
h
)
LE
D
Sp
e
a
k
e
r L
e
ft
Sp
e
a
k
e
r R
ig
h
t
S
t 15V
St 5
V
S
t 15V
12V
St 5
V
S
t 3.
3V
/
S
t 1.
2V
LI
P
S
Co
n
tro
l i
n
/
o
u
t
EEP
R
O
M
(2
4C
02)
EE
P
R
O
M
(2
4C
64)
CV
B
S
Ja
c
k
S-
V
id
e
o
Ja
c
k
St
e
re
o
-I
n
H/
P
Ou
tp
u
t
LED
/I
R/
Con
tro
l
Po
w
e
r
Vi
d
e
o
Au
d
io
Dat
a
HD
M
I
Ad
d
re
s
s
Da
ta
CLK
,D
Q
M
,
W
E
Z
,C
A
S
Z
,R
ASZ
EEP
R
O
M
(2
4C
02)
HY
5D
U
2
8162
2E
T
P
(D
D
R
S
D
R
A
M
128M
)
TV
Tu
n
e
r
(
T
A
F
T
-Z
7
03D
)
TV
Tu
n
e
r
(
T
A
F
T
-Z
7
03D
)
SC
L
/
S
D
A
L
G
E
6
991D
D
(S
c
a
le
r
+
V
ide
o
D
e
c
ode
r)
CO
M
P
ON
E
N
T
Ja
c
k
D-
S
u
b
Rx
/T
x
C
S
435
2
(D
A
C
)
5V
DC
-D
C
DC
-D
C
FE
T
St 5
V
LE
D
/
IR
B
o
a
rd
Co
n
tro
l
S
T
3
232C
D
R
(R
S
-232C
)
PW
M
_
D
IM
DI
M
_
CT
L
Y
D
A
138
(A
u
d
io
a
m
p
)
Rx
/T
x
SC
A
R
T
J
a
c
k
(O
p
ti
o
n
)
CV
BS
ou
t
Au
dio
ou
t
Au
dio
in
CV
BS
in
RG
Bi
n
Com
po
ne
nt
Y,P
b,P
r
Aud
io
In
L,R
Vide
oi
n
Aud
io
in
SCL
/S
DA
SC
L
/
SD
A
SC
L
/
SD
A
SI
F
_
O
U
T
CV
B
S
OU
T
Yi
n
Ci
n
5V
R
S
-232
C
R,G
,B
,T
XC
LK
R,G,B
,H
,V
PCAu
dio
In
Re
g
u
la
to
r
5V
IR
de
te
c
tor
Re
g
u
la
to
r
5V
2.
5
V
Op
ti
o
n
BLOCK DIAGRAM
- 19 -
300
200
120
122
123
501
500
900
910
920
540
530
51
1
510
400
410
820
LV
1
A2
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.
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
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
12V_PANEL
0.1uF
50V
C1018
12V_AMP
22uF
16V
C1020
10K
R1014
DIMMING_CTL
6.8K
R1018
10K
R1017
MP1583DN-Z
IC1002
3
SW
2
IN
4
GND
1
BS
5
FB
6
COMP
7
EN
8
SS
5V_G
RL_ON
5V_TUNER
15V
PWM_DIM
1/16W
59K
R1020
INV_CTL
10K
R1019
2700pF
50V
C1019
5V_G
1K
R1010
100
R1006
15V
10K
READY
R1013
2.5V_MST
AZ1117H-2.5TR/E1
IC1003
1
ADJ/GND
2
OUTPUT
3
INPUT
2.5V_DDR
WAFER-STRAIGHT
P1000
1
15V(18v)
2
15V(18v)
3
GND
4
GND
5
5V
6
5V
7
ACD
8
PWR-ON
9
INV_CTL
10
DIM
11
INV_BR
470uF
25V
C1023
0.47uF
25V
C1012
0.01uF
50V
C1013
1uF
25V
C1004
0
R1001
0
R1002
30uH
L1003
READY
R1003
10K
R1012
1uF
25V
C1006
READY
1uF
25V
C1007
5V
0
R1000
READY
KA78M05-R
IC1005
2
2
3
3
1
1
100uF
16V
C1014
100uF
25V
C1022
100
R1007
1.1K
R1008
220uF
16V
C1026
2SC3052
Q1000
E
B
C
330uF 25V
C1002
470uF
16V
C1005
470uF
16V
C1003
1uF
25V
C1016
1uF
25V
C1024
2W
43
5
%
R1022
2W
43
5
%
R1021
MBW3216-501TF
L1004
MBW3216-501TF
L1005
MBW3216-501TF
L1002
BG2012B080TF
L1001
BG2012B080TF
L1000
0
R1011
ST_3.3V
100uF
16V
C1008
0
R1009
18K
R1004
0.1uF
C1001
10uF
C1009
5.6K
R1005
SC4215ISTRT
IC1000
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
4.7uF
C1000
ST_5V
ST_5V
0
R1023
READY
0.1uF
50V
C1027
READY
0.1uF
50V
C1028
READY
0.1uF
50V
C1029
READY
RT1C3904-T112
Q1001
READY
E
B
C
4.7K
R1024
READY
5V_G
100K
R1029
1K
R1028
READY
1N4148W
READY
D1003
0.1uF 50V
C1037
22uH
L1007
3225
22uF
16V
C1032
RL_ON
5600pF
50V
C1036
0.1uF
50V
C1034
0.1uF
50V
C1035
9.1K
R1027
ST_1.2V
MBW3216-501TF
L1006
MP2305DS
IC1006
3
SW
2
IN
4
GND
1
BS
5
FB
6
COMP
7
EN
8
SS
ST_5V
0.47uF
25V
C1030
470uF
16V
C1033
2.4K
1%
R1025
6.8K
5%
R1026
1N4148W
READY
D1004
MBRS340T3G
D1002
0.1uF
50V
C1031
ST_5V
STAND_BY VOLTAGE
FROM LIPS
POWER
9 9
2007/11/19
LP81K
GENERAL VOLTAGE
V0 = 0.8(R1+R2) / R2
ST5V->ST3.3V->ST1.2V
R2
(OUT:1.27V)
R1
15V,ST5V
FROM SI4925
15V==>12_AMP
5V==>5V_G
12_PANEL
5V_TUNER
3.3V_MST
2.5V_MST
2.5V_DDR
SCHEMATIC DIAGRAM
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