LG 47LN549E (CHASSIS:LA3AA) Service Manual ▷ View online
- 17 -
6. All Source Audio
Check the TV Speaker Menu
(Menu -> Audio -> TV Speaker)
On
ok
ok
Replace C535, C537, C538, R516, R517
Check Connector & P501
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No
Replace Amp IC(IC501)
Check Output Signal P501
1, 2, 3, 4 pin.
No
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R503, R504
No
Check signal line. Or replace Mstar(IC101)
Replace Audio AMP IC(IC501)
Check signal line, L505, L506
ok
No
7. Digital/Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
Check IF_P/N Signal
TU1002 6 Pin
Replace IC1001
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
- 18 -
8. AV/RGB Audio
Check AV Cable for damage
for damage or open conductor
Check JK701 Signal Line
R706,R707
ok
ok
No
Replace Jack
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
ok
Check Output Signal JK902
4,5 pin.
Replace Phone Jack(JK902)
ok
No
Check JK902
Replace Phone Jack
if found to be damaged.
ok
No
Check External Speaker
Replace External speaker.
ok
No
Check AMP IC(IC901) Power 24V
L902
No
Replace L902
Check AMP IC(IC1800) Output
2,12,14, 24 Pin
No
replace AMP IC(IC901)
Check Mstar External AUDIO output
R201, R202
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP IC(IC901) Mute High
R1924, 4pin
No
Check signal line. Or replace Mstar(IC101)
9. External Speaker Out
- 19 -
Check RJP RJ45 Cable & HDMI cable
Check RJP Power 12V
L901, JK901 1pin
Replace L901, JK901 1pin
Check RJP Control Signal for input mode
R911, R909, R910, R912, R913
High level : above 3V
Replace R911, R909, R910, R912, R913
ok
ok
ok
No
No
Check RJ45 Jack(JK901)
Replace connector
if found to be damaged.
No
ok
Check RJP
Replace RJP.
No
10. RJP (only us model)
- 20 -
BLOCK DIAGRAM
R
GB
PC
PC
R
JP
H
D
M
I2
H
D
M
I1
H
AL
F
N
IM
(C
AN
)
R
S-2
32
C
Pa
ra
lle
l T
S
TU
_C
VBS
VBS
SI
F
S7
LR
2
M
AX32
32
32
SER
IA
L F
LA
SH
M
XI
C
(8M
B
B
IT
)
M
X2
5L
80
06EM
2I
-12
G
LVD
S
S
80
M
H
z
(60
H
H
z/12
0H
z/H
D
/F
H
D
)
A.
AM
P
N
TP75
00
00
U
SB
2.
2.
0
D
P/
D
M
SPK
L
/R
X
-t
a
l
2
4
M
H
z
51
P
I2S
R
JP
L/R
TM
D
S
R
GB/
H
H
/V
R
S232
C
R
ea
r
TM
D
S
D
D
R
2
Ad
d.
D
D
R
2
D
ata
SPI
AV
Si
de
N
AN
D
F
lash
(2GB
IT
)
H
Y27U
F08
2G2B
T
PC
B
B
PC
M
M
_A[
0:7
0:7
]
TM
D
S
H
D
M
I3
C
VBS,
L/
R
D
D
R
3
2G
Sa
msu
ng
K
4B
2G164
6C
-H
C
K
0
667M
H
H
z
A
T
2
4
C2
5
5
6
C
-S
S
H
L-
T
25
6K
B
IT
I2C
TI
A
M
P
E
xt
er
n
al
S
P
K
O
u
t
I2S
L/R
30
P
IR
ou
t-Pa
th
D
D
R
3
1G
H
yn
ix
H
5T
Q1
G63
EF
EF
R
-PB
C
C
667M
H
H
z
14
8.
5M
H
H
z
On
ly
ly
U
S
mo
del
del
SPD
IF
o
ut
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