LG 32LB9D (CHASSIS:LB73B) Service Manual ▷ View online
- 25 -
EXT1/2
AT/NT
TUNER
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
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
- 26 -
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 power 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
BLOCK DIAGRAM
- 27 -
Master
X260
I2C_A
I2C_B
I2C_C
+3.3V_L
+3.3V_L
+5V_TU
+5V_TU
+3.3V_L
3.3VST_MICOM
+3.3V_L
+3.3V_L
10k‰
10k‰
22‰
22‰
10k‰
22‰
100‰
33‰
100‰
22‰
22‰
0‰
22‰
2k‰
2k‰
5.6k‰
4.7k‰
22‰
100‰
6.8k‰
4.7‰
10pF
0xC2
0x74
0x80
0x1C / 80
0xA0
0x50
0x54
0x1C
0xA6
0x94
0x20
0x9C
Ch.1
Ch.2
Ch.3
CH1
Ready
2N7002
2N7002
Analog
T
uner
MSP
4450K
M62320
(F
AN)
Panel
SubMicom
EEPROM
Sub
Micom
Digital
T
uner
NTP
3000
CPU
EEPROM
CS
8416
MST
3361
LM75
Sub Micom
I
2
C Channel
*
33pF
- 28 -
AT
I
X2
6
0
AT
I
X2
6
0
CO
M
P
1
RG
B
HD
M
I2
CO
M
P
2
AV
1
AV
2
88
8
HD
M
I3
Rx
C
/0
/1
/2
R
x C
/0/
1/
2
Da
ta
8
b
it
TP1
12
MA
IN
RG
B 3
0
b
it
63
L
V
D
1
03
LV
D
S
T
x
63
L
V
D
1
03
LV
D
S
T
x
LV
D
S
Co
n
n
LV
D
S
Co
n
n
Vi
d
e
o
Sc
a
le
r
0
An
a
lo
g
Fr
o
n
t
En
d
An
a
lo
g
_
T
U
N
E
R
33
11
CV
B
S
,Y
,C
CV
B
S
,Y
,C
33
CV
B
S
Y/
P
b
/P
r
33
33
Y/
P
b
/P
r
33
R/
G
/B
/H
/V
55
R/
G
/B
2
8
b
it
3232
3434
TPA
Dig
it
a
l
In
p
u
t
Y/
P
b
/P
r
CL
K
/E
N
/H
/V
C
L
K
/E
N
/H
/V
4
b
it
HD
CL
K
/V
a
lid
/E
rr
o
r/
S
o
p
4
b
it
PD
P
:
D
ISP_
E
n
1
b
it
L
C
D
:
P
a
n
e
l_
CT
L
1
b
it
1
CV
B
S
MN
T
Ou
t
An
a
lo
g
Vi
d
e
o
OUT
ST
M
A
V
3
3
5
3:
1
DE
M
U
X
ST
M
A
V
3
3
5
3:
1
DE
M
U
X
HD
M
I1
88
R
x C
/0/
1/
2
3:
1
DE
M
U
X
2HD
M
I +
3A
D
C
88
MS
T
3
3
6
1
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1. VIDEO
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