LG 52LG72-UA (CHASSIS:LA86B) Service Manual ▷ View online
- 29 -
C
2008
AUDI
O PATH
A
T
/NT Tune
r
BCM355x
SIF
IF_V
SB/
QAM
SD_
S
IF1
ED
S
A
FE_I
F_
N
ED
S
A
FE_I
F_P
PI
3HDMI
3
4
1
ART
HDMI
HDMI_RX
_
0
_CL
K_N
HDMI_RX
_
0
_CL
K_P
H
D
M
I_
R
X_0_
D
A
T
A
0_N
H
D
M
I_
R
X_0_
D
A
T
A
0_P
H
D
M
I_
R
X_0_
D
A
T
A
1_N
H
D
M
I_
R
X_0_
D
A
T
A
1_P
H
D
M
I_
R
X_0_
D
A
T
A
2_N
H
D
M
I_
R
X_0_
D
A
T
A
2_P
C
S
5345-
CQ
ZR
(Audio SW)
MC
33078
(AMP)
C
S
5340
(A/D)
AV
1
AV
2
COMP
1
COMP
2
RGB
I2
S_
C
L
K_I
N
I2
S_
D
A
T
A
_I
N
I2
S_
L
R
_I
N
I2
S_
C
L
K_O
U
T
I2
S_
D
A
T
A
_OU
T
I2
S_
L
R
_O
U
T
N
T
P3000
(D-AMP)
A
UD_
SPD
IF
buffer
SPDIF out
C
o
axia
l o
u
t
A
U
D
_
LE
FT
_P
A
UD_
R
IG
H
T_P
MNT out
TMD
S
141
HDMI4
- 30 -
C
2008
T
V/CATV
Check TU1 Pin14(SIF)
Can y
o
u see t
h
e n
o
rmal sign
al?
Check the input (Pin
A
N
23) of BCM355x((I
C100).
Measure
w
a
v
e
form at C665
because itís mo
re eas
y
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
Could y
o
u measu
re
v
o
ltag
e o
f T
U
1 & IIC lin
es?
A
re they
all normal?
NO
You should check po
w
e
r
line
& IIC li
nes.
YES
You should replace TUNER.
NO
NO
A
ft
e
r checking audio signal line, y
ou should
decide to
replace item or not.
Audio(In)
- 31 -
C
2008
A
V/Component/RGB-PC
Audio(In)
Check JK
701,
JK70
7, JK70
0, JK702, JK
703
.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
NO
JK701, JK707, JK700, JK702, JK703 may
h
a
v
e
problem. Replace this
Jack.
Check the input (Pin 7,8,9,10,11,12,21,22,26,27) of CS5
345(IC500).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
NO
NO
NO
NO
NO
NO
NO
YES
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
Check the Output (Pin LOUT1,ROUT1) of CS5345(IC500).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking the Po
w
e
r &
I2C of this chip
, y
o
u should decide to replace this or not
YES
YES
Check the input (Pin INPUT1-,INPUT2-) of MC33078DR2G(IC504).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
YES
Check the Output (Pin OUTP
U
T1,OUTPUT2) of MC33078DR2G(IC504).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking the Po
w
e
r
of this chip, y
ou should
decide to replace this or not.
YES
Check the input (Pin
A
INL,
A
INR) of CS5340(IC502).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
YES
Check the Output (Pin SDOU
T,SCLK,LRCK) of CS5340(I
C502).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking the Po
w
e
r &
MLCK & reset of this chip,
y
ou should
decide to replace this or not.
YES
Check the input (Pin
A
H
24,A
J24,
A
K
24) of
BCM355x((IC100).
Measure
w
a
v
e
form at R559,
R560,R
561 b
e
cause itís mo
re eas
y
to
ch
e
ck.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
- 32 -
C
2008
HDMI
Audio(In)
Check input connect JK600,
JK601,JK708
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
Check DDC communication lines
(IC601, IC602,
IC701)
JK60
0,JK6
01,
JK70
8 ma
y
h
a
v
e
p
roblem. R
e
place th
is Jack.
Check the output of
PI3HDMI341
A
T
R(IC600).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking the Po
w
e
r
of this chip, y
o
u should
decide to replace this or not.
Check HD
CP co
mmunicatio
n lin
es(IC102)
A
ft
e
r checking the Po
w
e
r
of this chip, y
ou should
decide to replace this or not.
YES
YES
YES
NO
NO
NO
NO
A
ft
e
r checking the Po
w
e
r &
Select Pin &
Etc of this chip, y
o
u should
decide to replace this or
not.
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