LG 37LG30RA / 37LG32R (CHASSIS:LP81A) Service Manual ▷ View online
- 21 -
10-1 Symptom
1) LED is green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
10. No Sound
10-2 Check process
All input(mode)
is no sound.
Only HDMI is
no sound
Only AV/
COM2/PC input is
no soudn.
Only RF is no sound.
Check the Tuner In/Out.
Check the signal after
IC600 refer to circuit
diagram
Is the output of
IC600 normal?
IC600 normal?
Download the EDID data.
No
No
No
No
No
Yes
Yes
Yes
Yes
Menu?
Normal
Normal
No
No
No
No
Yes
Yes
Yes
Replace
IC600
Is the speaker
on it men?
Set on speaker
in menu
Check the
Speaker cable
Replace
IC801
Replace
IC601
Is the speaker
cable normal?
cable normal?
IC801 operate
normal?
IC 601 operate
normal?
Replace Main B/D
- 22 -
BLOCK DIAGRAM
AV
1 in
SideAV in
(AV
2 in)
Comp1 in
Comp2 in
RGB in
(D/L)
CVBS IN
Y/
Pb/
Pr
IN
R/
G/B/H
S
/V
S
IN
CVBS IN
LINE
OUT
LINE
IN
AM
P
_
M
U
T
E
R
S
-232C
Rx/
T
x
M
X
3232
RF
(Tuner)
PC Audio
in
DISPL
AY M
O
DUL
E
EDID N
V
M
EDID N
V
M
HDMI1
HDMI2
HDMI3
USB
T
M
D
S
351P
A
G
HDMI MUX
Zor
an
V
A
D
D
IS
-966XD
MPEG
Dec
ode
r
DDR MEM
DDR MEM
SERI
A
L
FL
A
S
H
Mstar
Rom
eo
L
G
E6891
C
D
T
W
9
910
Su
b D
eco
de
r
N
T
P3000
A
Digital
A
udi
o A
M
P
MA
IN
NVM
M
C
7
4
H
C4066
A
udio SW
L
M
324
X4
A
M
P
SERI
A
L
FL
A
S
H
B
D
2041
Protect IC
EDID N
V
M
DDC/HDP/CEC
TMDS(HDMI in)
DDC/HPD/CEC
TMDS(HDMI in)
TMDS(HDMI in)
U
S
B
(A
V
I/O,
Da
ta I/O
)
+5V
CVBS
OUT
656 I
N
SW_RE
SE
T
P
A
R
T
_I
2
C
P
A
R
T
_I
2C
SW_RE
SE
T
I2
S O
U
T
LVDS
MPE
G R
X
/T
X
M
P
EG
RE
SE
T
I2
S I
N
656 I
N
TMDS(HDMI in)
DDC/HPD/CEC
DDC/HPD/CEC
[CEC not thr
ou
gh HDMI MUX,
dir
e
ct
J
A
C
K
to
M
A
IN
IC]
DDC
DDC
DDC
U
A
RT
_R
x/T
x
AU
D
IO
_
S
W
LINE
IN
LINE
IN
LINE
IN
Y/
Pb/
Pr
IN
LINE
IN
Y/C IN
LINE
IN
EDID N
V
M
ROM_
I2
C
DSUB_DDC
x0.55
x0.55
x0.55
x0.55
S_
VI
D
E
O_
DE
T
LINE
_MUTE
LINE
OUT
x4
x0.55
LINE
IN
CVBS IN
SIF IN
TUNER_
I2
C
P
A
R
T
_I
2C
HDMI_S
EL
(Option)
(Option)
(Option)
Spk
Out
1W(Mono)
SW_RE
SET
T
P
A
3107D
A
udi
o A
m
p
- 23 -
EXPLODED VIEW
801
803
805
806
804
802
550
830
540
821
400
522
530
300
120
122
510
500
901
900
121
200
200T
200N
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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