LG 47LG50DC (CHASSIS:LA85Z) Service Manual ▷ View online
- 25 -
C
2008
9. SPEAKER-AUDIO(OUT)
Check the outp
ut (Pin AK25,AL25,AJ25) of B
C
M3553(IC100).
Measure
w
a
vef
orm at R2635,
R2636,R2637
because itís more eas
y to check.
Can you see the normal signa
l?
Check the input (Pin 17,18,19) of N
T
P3000((
IC501).
Can
you se
e the normal
w
a
vef
orm?
YES
NO
NO
T
h
is board has big problem because Main c
h
ip(BCM3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should d
e
cide
to rep
lac
e
BCM355
3 or not.
After checking audio signal line,
y
ou should decide to replac
e
item or not.
YES
Check the output (Pin 30,31,3
6,37,47,48,53,54) of NT
P3000((IC501).
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking
the Po
w
e
r & I2C & Reset of this chip,
you should decide to replac
e this or not.
Check the speaker output
w
a
fer P501.
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking audio signal line,
y
ou should decide to replac
e
item or not.
Check the connector & Speaker
*
If
condition of
s
tar
ting sound is
abn
o
m
a
l,
you have
to check
IC1000(
T
PA300
5).
- 26 -
C
2008
10. SPDIF & COAXIAL-AUDIO(OUT)
Check the outp
ut (Pin AK25,AL25,AJ25) of B
C
M3553(IC100).
Measure
w
a
vef
orm at R2635,
R2636,R2637
because itís more eas
y to check.
Can you see the normal signa
l?
Check the input (Pin 17,18,19) of N
T
P3000((
IC501).
Can
you se
e the normal
w
a
vef
orm?
YES
NO
NO
T
h
is board has big problem because Main c
h
ip(BCM3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should d
e
cide
to rep
lac
e
BCM355
3 or not.
After checking audio signal line,
y
ou should decide to replac
e
item or not.
YES
Check the output (Pin 30,31,3
6,37,47,48,53,54) of NT
P3000((IC501).
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking
the Po
w
e
r & I2C & Reset of this chip,
you should decide to replac
e this or not.
Check the speaker output
w
a
fer P501.
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking audio signal line,
y
ou should decide to replac
e
item or not.
Check the connector & Speaker
*
If
condition of
s
tar
ting sound is
abn
o
m
a
l,
you have
to check
IC1000(
T
PA300
5).
- 27 -
C
2008
1
1. MNT OUT
-AUDIO(OUT)
Check the outp
ut (Pin AN28, AP29) of BCM3553(IC
100).
Measure
w
a
vef
orm at R685, R
686 bec
ause ití
s more eas
y
to
check.
Can you see the normal signa
l?
NO
T
h
is board has big problem because Main c
h
ip(BCM3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should d
e
cide
to rep
lac
e
BCM355
3 or not.
Check the input of JK705.
Can
you se
e the normal
w
a
vef
orm?
YES
NO
After checking audio signal line,
y
ou should decide to replac
e
item or not.
YES
After checking the Jack, y
ou s
hould
decide to replace item o
r not.
C
2008
- 28 -
BLOCK DIAGRAM
Flash
(1
6MB)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
74LVC14APW
C
S
5345
(Audio S/W
&A/D&)
MTV416
(Micom)
NTP
3
0
0
0
(D-AMP)
X200
X-tal(54
)
PI
3HDMI
3
4
1
ATR
(2x1,S/W
)
EEPROM
A
T
/NT Tune
r
64Bit I/F
R
eset
CVBS
CVBS/Y/C
Y/Cb/Cr
R/G/B
H/V Sy
nc
Audio L/R
I2S
MNT out
(L/R)
SPDIF
OUT
I2S
Full H
D
(1080
P)
RS-232
C
Dead IC
w
h
e
n
Standby
A
li
v
e IC
w
h
en
Standby
Video
Fro
nt
End
Du
al
HDMI
Rx0
HD/SD
Video
Encoder
Aud
io
DSP
BCM3552(HD)
BCM3553(FHD)
MCLK
MCLK
HDMI CEC
HDMI CEC(To
M
ico
m)
To Micom
SDA
SCL
SIF
IF(AT)
Buffer
Digital out
Buffer
Buffer
24
C16
AGC CTL (F
ro
m BCM)
USB2.
0
I2S Audio Input
VSB/
QAM/NTSC/S
IF
AV
1
COMP
1
COMP
2
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR (1
2
8
MB)
RGB
Y/Cb/Cr
HDMI1
HDMI2
AV
1
COMP
1
COMP
2
RGB
C
o
axia
l
OUT (L
G
5
0)
USB
LG50: FHD-6
0Hz
X400
X-tal(24
)
NVRAM
24
C512
EE
PRO
M
EE
PRO
M
LVDS
Connector(26P)
Du
al
HDMI
Rx1
TPA3005D2
PHPR
G
4
IR & Local
KEY
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