LG 15LS1RA (CHASSIS:LN71A) Service Manual ▷ View online
- 17 -
No Sound
Check the speaker wire
Change source input.
Check the
input source.
Fail
Pass
Re-solder or Change the defect part.
Check X100.
Check X100.
Check the input/output
of IC100
Fail
Pass
Re-solder or change the defect part.
Check the input/output
of IC400
Fail
Pass
Change the speaker
Check the speaker
Fail
Pass
- 18 -
BLOCK DIAGRAM
IR
d
e
te
ct
or
5V
LV
D
S
M
O
D
U
L
E
M
X
25L
400
5A
(S
e
ri
al
F
lash
)
Co
n
tr
o
l B
o
a
rd
(T
a
c
t S
w
it
c
h
)
LE
D
S
p
eaker L
e
ft
S
p
eaker R
ight
TTL M
O
D
U
L
E
15V
5V
15V
12V
_
P
a
ne
l
5V
5V
15V
LIP
S
YPbPr in
A u
dio
in
Vid
eo
in
A udi
o in
Y in
C in
C
ont
ro
l i
n
/out
EE
P
R
O
M
(24C
64)
CV
BS
Jack
S
-V
ide
o
Jack
Ste
re
o
-I
n
(Opt
io
n)
H/
P
Out
put
LE
D / IR
/ Co
ntr
ol
Po
w
e
r
Vi
de
o
A
udi
o
Da
ta
A
ddr
e
ss
Da
ta
CL
K,
DQ
M
,
WE
Z
,C
A
S
Z
,R
A
S
Z
EE
P
R
O
M
(24C
02)
M
12L
1
616
1A
-5
T
G
(S
D
RAM
)
C
V
B
S
Tune
r
C
V
B
S
Tune
r
SC
L
/SD
A
SC
L
/SD
A
SC
L
/SD
A
SI
F
_
O
U
T
M
S
T
9
6
585
(S
c
a
le
r +
V
ideo D
e
c
oder
)
Component
D
-Su
b
RS-232C
(Option)
Rx
/T
x
3.
3V
12V
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
5V
1.
8V
LE
D
/IR
B
oar
d
Co
nt
ro
l
M
X
232A
(R
S
-232C
)
ON
/O
F
F
PWM
_
D
IM
DI
M
_
C
T
L
YD
A
1
3
8
(A
udi
o a
m
p)
Rx
/T
x
F
E
T
Swi
tch
(SI
4925B
D
Y
)
5V
12V
IF
_
V
id
e
o
- 19 -
MEMO
- 20 -
EXPLODED VIEW
300
200
120
120
590
431
580
520
41
1
400
530
441
440
430
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