LG 32LB4DS (CHASSIS:LA73A) Service Manual ▷ View online
- 25 -
EXT1/2
AT/NT
TUNER
LGDT
3303
X260
TP A
TP C
RGB
COMP 1/2
SIF
SIF IN 1
NTP
3000
SIF IN 2
I2S IN 1
I2S IN 2
I2S OUT 1
SPDIF OUT
CS8416
I2S
I2S
I2S
I2S
S/PDIF
SPDIF
L/R
L/R
L/R
L/R
ANT/Cable
VSB TP
MSP4450K
MNT
OUT
OUT
I2S
I2S
I2SI 3
I2SO 1
SC 2
MCLK
MCLK
SPDIF OUT
Optical
Coaxial
HDMI 1/2/3
Check M SP4450K (IC508) outpu ts
R5039(SCLK), R5040(LRCLK), R5043(DATA)
1
2
3
5
6
7
Fol lo w the pr ocedur e of
" COMMON SOUND OUT"
Check M SP4450K (IC508) Inputs
R5041(AV1_R), 5042(AV1_L),
R5045(AV2_R), R5046(AV2_L),
R5048(CMP1_R),R5049(CMP1_L),
R5051(CMP2_R),5052(CMP2_L),
R5055(RGB_R), R5058(RGB_L)
R5041(AV1_R), 5042(AV1_L),
R5045(AV2_R), R5046(AV2_L),
R5048(CMP1_R),R5049(CMP1_L),
R5051(CMP2_R),5052(CMP2_L),
R5055(RGB_R), R5058(RGB_L)
Check A V/COMPONENT/RGB Cable
Check X260 ( IC101) Inpu ts
R175(SCLK), R176(LRCLK), R177(DATA)
Check M SP4450K (IC508) X-tal Inp ut
X-tal Input (71,72pin)
Check M SP4450K (IC508) Power
4
(5) AV / Component / RGB / No Sound
- 26 -
EXT1/2
AT/NT
TUNER
LGDT
3303
X260
TP A
TP C
RGB
COMP 1/2
SIF
SIF IN 1
NTP
3000
SIF IN 2
I2S IN 1
I2S IN 2
I2S OUT 1
SPDIF
CS8416
I2S
I2S
I2S
I2S
S/PDIF
SPDIF
L/R
L/R
L/R
L/R
ANT/Cable
VSB TP
MSP4450K
MNT
OUT
OUT
I2S
I2S
I2SI 3
I2SO 1
SC 2
MCLK
MCLK
SPDIF OUT
Optical
Coaxial
HDMI 1/2/3
Check CS 8416 (IC501) inputs
HDMI_SPDIF (C5005)
1
2
3
4
5
Fol lo w the pr ocedur e of
" COMMON SOUND OUT"
6
Check M ST3361 (IC402) output
HDMI_SPDIF (R409)
Check H DMI Cable
Check X260 ( IC101) Inpu ts
SCLK(R175), LRCLK(R176), DATA(R177)
Check C S8416 (IC501) ou tputs
DATA(#26), SCLK (#27), LRCLK(#28)
(6) HDMI No Sound
- 27 -
1. Block Diagram For EMF
Check t he device power LED
Check t he device Cable.
Is it USB1.1 cable ?
If th e device is HDD, ch eck a
external po wer adaptor.
Check V BUS_5V
Check t he DC/DC Converter
(IC712)
N
Y
Y
N
N
2. Check Sequence
Replace the cable to USB1.1 cab le
or Replace t he device.
Y
N
Replace th e DC/DC Con verter
(IC712)
Exception
- USB power co ul d b e di sabl ed by inru shi ng curre nt
- In th is case , remo ve the de vice and try to rebo ot the TV (AC pow er off/on )
X260
USB_ link
(IC101)
DC/DC Conv erter
(IC712)
J
A
C
K
C
K
Side B/D
USB1.1_OVRCUR
5V_USB
VBUS_5V
DP,DM
Cable
USB_PWR_DOWN
DEVICE
(HDD or Me mor y)
USB 1.1 cable
3. USB
- 28 -
AT
I
X2
6
0
ATI
X2
6
0
SIF
NT
P
3
0
0
0
I2
S
SPD
IF
I2
S
CV
B
S
(N
T
M
a
in
)
DDR
2
64
M
B
x
2
DD
R
2
64
M
B
x
2
Fl
e
x
B
u
s
RG
B 3
0
b
it
TP
A
An
a
lo
g
Fr
o
n
t
En
d
US
B
1
.1
I2
C
P
o
rt
0
I2
C
CH
1
I2
C
CH
2
I2
C
CH
3
MT
V
4
1
5
Mi
c
o
m
MT
V
4
1
5
Mi
c
o
m
US
B
(
u
p
g
ra
d
e
r
e
a
d
y
!!
)
D
e
ad
I
C
w
hen
S
tan
d
b
y
D
e
a
d
IC
w
h
e
n
S
ta
n
d
b
y
Vi
d
e
o
S
c
al
er
0
Vi
d
e
o
Sc
a
le
r
1 o
r
2
Al
iv
e
I
C
w
h
e
n
S
ta
n
d
b
y
A
li
v
e
I
C
w
h
en
S
tan
d
b
y
Aud
io
Vi
d
e
o
TP
AV
2
/
L
/
R
MNT
O
u
t L
/
R
CO
M
P
1
L
/
R
CO
M
P
2
L
/
R
RG
B L
/
R
TP
_
IN1
AV
1
AV
2
AV
1
, Y
/
C
1
AV
2
, Y
/
C2
Fl
a
s
h
(N
O
R
3
2
M
B
Fl
a
s
h
(N
O
R
3
2
M
B
)
La
tc
h
x
2
La
tc
h
x
2
24
C
5
12
24
C
5
12
Cab
le
A/
N
T
LG
DT
3
3
0
VS
B
L
G
D
T
33
03
6
3
L
V
D
102
3
63
L
V
D
1
0
2
3
10
80
P
LV
D
S
Co
n
.
10
80
P
LV
D
S
Co
n
.
Du
al
AV
1
/
L
/
R
GP
IO
I2
S
AT
I
X
2
50/
X
260
?
?
(#
o
f M
P
E
G
de
c
o
de
r)
CO
M
P
2
RG
B
C
S
84
16
C
S
84
16
HDM
I S
P
DI
F
I2
S
I2
S
MS
T
3
3
6
1
1
HDM
I +
1A
D
C
MS
T
3
3
6
1
1HD
M
I +
1A
D
C
RG
B
HD
M
I1/
2/
3
SPD
IF
SPD
IF
CO
M
P
1
Op
t.
FR
C9
4
x
y
H
F
R
C9
4
xyH
DD
R
1
16
M
B
DDR
1
16
M
B
RG
B o
d
d
R
G
B
ev
en
120
H
z
TP
B
US
B
1
.1
US
B
(E
M
F)
PC
I
3:
1
Dem
u
x
3:
1
De
m
u
x
24C
16
24
C
1
6
Air
3:
1
De
m
u
3:
1
De
m
u
x
M
S
P
4
450
K
MS
P
4
4
5
0
K
I2
S
SI
F
BLOCK DIAGRAM
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