LG 32LG80FD (CHASSIS:LJ82C) Service Manual ▷ View online
- 29 -
Digital TV Audio Trouble Shooting
Check v ideo output
Foll ow pr oc edure All s ourc e audio
trouble shooti ng
Y
Foll ow pr oc edure digita l TV
video trouble shootin g
N
N
Maybe BCM3553 in tern al au dio
DSP has prob lems . Repla ce it
Analog TV Audio Trouble Shooting
Check v ideo output
Foll ow pr oc edure All s ourc e audio
trouble shooti ng
Y
Foll ow pr oc edure analog TV
video trouble shootin g
N
N
Maybe BCM3553 audio blo ck h as
problems. Rep lace it
Check L 801 voltag e level 5V
Replace it
N
Y
Check SIF sign al
C801 / C806 / Q800
Replace it
N
Y
Check SIF sign al
R652 / C665
Replace it
N
Y
- 30 -
Compon
en
t / RG
B / AV
Audio Trouble Shooting
Ch
eck v
id
e
o
o
u
tp
u
t
Y
Foll
o
w
pr
oc
edure
ex
te
rn
a
l input
v
ide
o
trouble
s
h
o
o
ti
ng
N
Check Connector
J
K
700 / J
K
702 (Compone
nt)
JK70
3 (RGB)
JK70
1 / JK707
& cab
le ( Rear,
Side)
Replace connector
N
Y
Ch
eck sig
n
a
l
C734 / R74
6
/ C735 / R75
2
(Compone
nt1
)
C736 / R74
8
/ C737 / R75
6
(Compone
nt2
)
C733 / R76
1
/ C732 / R76
2
(RGB)
C701 / R73
7
/ C700 / R73
8
(AV
Rear)
C729 / R73
3
/ C728 / R79
5
(AV
Side)
Rep
lace it
N
Y
Ch
eck IC50
0 p
o
w
e
r L
512 v
o
ltag
e
lev
el 9V
Rep
lace it
N
Y
Ch
eck sig
n
a
l
R532 / R533 / C555 / R568 / C563 /
R582
Rep
lace it o
r IC500
N
Y
Ch
eck IC50
3 p
o
w
e
r L
513 v
o
ltag
e
lev
el 9V
Rep
lace it
N
Y
Ch
eck sig
n
a
l
C554 / R569 / R581 / C56
2
Rep
lace it o
r IC503
N
Y
Ch
eck IC50
2 p
o
w
e
r L
514 v
o
ltag
e
le
v
e
l 3.3V & L
515
v
o
ltag
e lev
el
5V
Rep
lace it
N
Y
Ch
eck IC50
2 p
o
w
e
r L
514 v
o
ltag
e
le
v
e
l 3.3V & L
515
v
o
ltag
e lev
el
5V
Rep
lace it
N
Y
Ch
eck I2S sig
n
a
l
R548 / R54
9 / R550
Rep
lace it o
r IC502
N
Y
Ch
eck A
u
d
io
clo
c
k
R134
Rep
lace it
N
Y
May
b
e BCM3
553 h
as p
ro
b
lems
- 31 -
HDMI Audio Trouble Shooting
Check v ideo output
Foll ow pr oc edure All s ourc e audio
trouble shooti ng
Y
Foll ow pr oc edure HDMI video
trouble shooti ng
N
N
Maybe BCM3553 audio blo ck h as
problems. Rep lace it
Check EDID N VRAM (IC700, 603, 604)
Power & I2C Sig nal (#5, #6)
Replace it o r red ownlo ad
Y
N
USB T r ouble Shooting
Check USB 2. 0 Cable
Check L 205 voltag e level 5V
Y
N
Replace it o r IC202
Check P20 1
Replace it
Y
N
Check USB D evice
If de vice is 2.5 inch HDD, check po wer
adapto r
Y
Maybe BCM3553 has p roblems
Y
• Excep tio n
- USB p ower could be disabled by inrus hing curre nt
- In t his case, remo ve the dev ice and try to reboot the TV (AC po wer off/on)
- 32 -
BLOCK DIAGRAM
Fl
a
s
h
(3
2
M
B
)
CS
5
3
4
5
Au
d
io
SW
/
A
M
P
/A
D
C
MT
V
4
1
6
(M
ic
o
m
)
N
T
P
3000A
_
F
ro
nt
(D
ig
it
a
l AM
P)
64
B
it
I
/
F
RG
B
-P
C
HD
M
I
1/
2
/
3
COM
P
1
COM
P
2
AV
1
AV
2
RG
B
-P
C
I2
S
MC
L
K
Di
g
it
a
l o
u
t
CO
M
P
1
CO
M
P
2
AV
1
AV
2
BC
M
7
4
1
2
(M
P
E
G
4
De
c
o
d
e
r)
T
C
905
12
DV
I
I2
S
SI
F
SPD
IF
O
u
t
CV
B
S
C
V
B
S
/Y
/C
Y/C
b/
C
r
R/
G
/
B
DDR1
(64M
B)
Se
ri
a
l TP
20
b
it
s
12b
it
Y
C
4
:2:
2
NI
M
T
U
NE
R
TM
D
S
_
R
X
+-
EP
M
2
4
0
F
MNT
o
u
t (
A
u
d
io
O
n
ly
)
T
M
D
S
341
A
(3
x
1
,S
/
W
)
C
V
B
S
/Y
/C
RS
2
3
2
RX
/
T
X
DV
I
4:
2:
2
20
b
it
Y
C
F
u
ll
HD
(1
0
80P
)
DM
1
/
DP
1
Se
ri
a
l
TP
74
H
C
04
SP
D
IF
O
u
t
(C
o
a
x
ia
l)
Vi
d
e
o
Fr
o
n
t
En
d
Du
a
l
HD
M
I
Rx
HD
/
S
D
Vi
d
e
o
En
c
o
d
e
r
Au
d
io
DS
P
US
B
2
.0
PK
T
HS
X
PC
I/
EB
I
HD
-D
V
I
IB
0
Pa
rs
e
2
RS
B
U
F
XC
B
U
F
RM
X
0
BC
M
3
5
5
3
L
o
c
a
l KEY
24C
16
M
C
74L
C
X
14D
T
X-
ta
l(
5
4
M)
Reset
K
IA
702
9
NV
R
A
M
I2
C
An
a
lo
g
/
D
ig
it
a
l
Tu
n
e
r
RF
Sw
it
c
h
N
T
P
3000A
_
W
o
o
fe
r
(D
ig
it
a
l A
M
P
)
DDR1(128MB)
(16Mx16x4)
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