LG 32LX5DCS-UA (CHASSIS:LA64A) Service Manual ▷ View online
- 21 -
3. In case of no sound
(1) Symptom
Ø
LED is green
Ø
Screen display but sound is not output.
(2) Check following
Is this problem occur
in some input(mode)?
Is the output signal
of the P400 normal?
Cable inserts well.
Only HDMI is no sound?
No
Yes
No
Cable inserts well.
Is the cable
connetde normal.
No
Yes
Cable inserts well.
No
Only RF is no sound?
Check the
Tuner IN/OUT.
No
No
No
No
Is the cable
connected normal?
Is the IC1111
(MSP4450) output?
Replace Main board.
Replace IC.
Yes
Only AV/ component/
PC input is no sound?
Yes
Yes
No
Is the IC1111 (MSP4450)
output normal?
Replace IC.
Yes
Yes
Replace Main board.
BLOCK DIAGRAM
- 22 -
1. Overall Block Diagram (D2A + BCM7411 + Cortez Adv.)
D
IG
IT_
D[0
-23]
H
,V_SY
N
C
_
D
IGIT
DE,C
LK
_D
IG
IT
D
2
A_VI
D
E
O_OU
T
TMDS_
0
T
M
D
S
_1
DDC_I
2C
_
0
,1
EEPR
OM
_1
EEPR
OM
_0
TUNER_CVB
S
AT
S
C
/N
T
S
C
Tun
er
R,
G,
B
VG
A_
H,
V S
Y
N
C
C
A
BLE_
D
E
T
COMP
ON
ENT
(Y
,Pb,Pr
)
COMP
ON
ENT (Y
,P
b
,Pr)
REAR CVB
S
SIDE
_CV
BS
S_
VI
D
E
O
Y
,C
(r
e
a
r/
s
id
e
)
S_
VI
D
E
O
D
E
T
TUNER_C
VB
S
I2
S
C
o
m
p_1/2
L/
R
MSP L
/R
A
n
a
log
L/R
C
V
BS
,S
-V
ID
EO
L/
R
VG
A
L/
R
MNT_
OUT_
L/R
SPDIF_
O
U
T
IR
I2
C
_
D2A
(AT)
I2
C
_
Co
rt
e
z
(NT)
I2
C
_
Co
rt
e
z
SIDE L/R
D2
A
UA
R
T
_
D
2A
_
0
RS232
232
C_
Tx / R
x
MSP4450K
T
P
A
3100D2
I2
C
_
Co
rt
e
z
MNT_V
_
OUT
INV
_
B
R
DI
GIT
A
L
_IN
[2
4B
it]
DE,CLK
_
IN
DI
GIT
A
L
_H,
V
_S
YNC
ANA
LOG_IN
A
N
ALO
G_
H,
V_SY
N
C
ANA
LOG_IN
C
A
BLE_
D
E
T
ANA
LOG_IN
ANA
LOG_IN
ANA
LOG_IN
ANA
LOG_IN
ANA
L
OG IN
INV
_
BRI
D
ISPL
A
Y
_E
N
AI
_
O
N
_
O
FF/
OD
S
E
L_1
LV
D
S
_
D
AT
A
LV
D
S
_
D
AT
A
D
ISPL
A
Y
_E
N
INV
_CT
L
IR
UART
1
UART
1
LVDS
Conne
cto
r
For LCD
POWER
HDMI
SiI9023
NVRAM
EEPR
OM
16 KB
DDRRAM
(256
Mb
)
$4
Flash
2MB
$1
2
3
2
C Driver
S
T
32
32
CDR
NV
RAM
EEPR
OM
32KB
A
T
49BV160C
F-RO
M (2
MB
)
$ 0.46
DDRR
AM
(32M
B)
$2.7
I2
C
M
U
X
S
IF
_
T
U
N
E
R
I2
S
I2
S
N
J
U26901
A
N
T
./C
ab
le
I2
C
_
D2A
VSB
Pro:Idiom
B
C
M7411
DDRR
A
M
(128
M
B
)
I2
S
CPLD
12_t
o_2
4
EBI
8_t
o
_16
8
16
DI
GIT
A
L
_IN
[2
4B
it]
DE,CLK
_
IN
DI
GIT
A
L
_H,
V
_S
YNC
UA
R
T
_
D
2A
_
1
SERIA
L_TS
I2
S
D
IG
IT_
D[0
-23]
H
,V_SY
N
C
_
D
IGIT
DE,C
LK
_D
IG
IT
Cortez-A.
FLI8662
UART
MUX
UART
0
UART
0
MSP SPDIF
Pa
ral
le
l T
o
Ser
ia
l
SPDIF
MUX
7411 SPD
IF
D2
A
S
P
D
IF
D2
A
S
P
D
IF
I2S
MUX
Impl
em
ente
d
in CPLD
I2
C
_
Co
rt
e
z
_5V
MEMO
- 23 -
- 24 -
550
600
530
590
540
910
900
531
300
200
120
710
210
220
230
240
250
260
270
580
521
581
400
520
522
EXPLODED VIEW
A21
A2
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