LG 42PG6500-ZA (CHASSIS:PD82A) Service Manual ▷ View online
- 21 -
6. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check following
All input(mode) is no
sound?
Only HDMI is No
Sound?
Yes
No
Download
the EDID data
Check the signal after
CAX2069 refer to circuit diagram
Yes
Only specific input
(except HDMI,DTV,RF)
is no sound?
Check the signal before
CAX2069 refer to circuit diagram
No
No
YES
Only RF is no sound?
Check
the Tuner IN/OUT
Yes
No
YES
Only AV/component/PC
input is no sound?
Is the output of
CXA2069 normal?
Yes
No
IC1300 operates
normal?
Replace the IC1300
(MSP4450)
No
IC1301 operates
normal?
Replace the IC1301
(NTP-3000A)
No
YES
Replace the VSC B/D
YES
No
Replace the CXA2069
Is the speaker On it
menu?
Set on speaker in menu.
No
Is the speaker Cable
normal?
Check the Speaker
Cable.
No
Yes
- 22 -
BLOCK DIAGRAM
HDMI4
HDMI4
C
o
mmo
n
In
te
rf
a
c
e
LV
D
S
AV
1
AV
AV
1
DT
V
O
u
t
MNT
O
u
t
RG
B
RG
B
PC
A
U
D
IO
PC
A
U
D
IO
S
T
i7101
MP
E
G
D
e
c
o
d
e
r
3.
3V
5V
F
L
I8
548H
-
L
F
(C
O
R
T
E
Z P
lu
s)
D
igi
ta
l V
ide
o
P
ro
c
e
sso
r
HD
M
I2
HD
M
I2
HD
M
I
S/
W
(3
:
1
)
C
X
A
2
069Q
AUDI
O
/V
IDE
O
SW
9V9V
M
S
P
4450K
So
u
n
d
P
ro
c
e
sso
r
9V
5V
N
T
P
300A
A
u
d
io I
C
18V
18V
V
L
R
Y/C
V
L
R
Y/C
C
o
m
pon
e
n
t
Y Pb Pr L
R
Y Pb Pr L
R
HD
M
I3
HD
M
I3
SPD
IF
SPD
IF
HD
M
I1
HD
M
I1
HD
M
I
RX
(2
:
1
)
HD
M
I
B
u
ffe
r
74L
C
X
1
57
3.3
V
R
S
-232
R
R
S
-232
D
T
V_C
L
K
Bu
ffer
H
s
yn
c,
V
s
yn
c,
D
E
RG
B2
4
B
it
TMDS
TMDS
TM
D
S
TM
D
S
H
s
yn
c,
V
s
yn
c,
D
E
RG
B2
4
B
it
FE_
TS
_DA
TA
CI_
T
S
_D
A
T
A
TS_
DAT
A
Buff
er
SI
F
/A
M
_
A
U
D
IO
T
V_VO
U
T
I2
S
_
D
T
V
I2S_
HDMI
I2
S
HDMI_
CLK
AVR
/L
OUT
TVR
/L
OUT
I2S
RE
C
8
T
U
_M
A
IN
C
V
B
S
/Y
/C
,L
/R
DTV/
MN
T
V,R
/L
OU
T
C
V
B
S
,D
T
V
L
/RO
U
T
SCA
RT
V,
R/L
IN
TV
R/L
OUT
SPD
IF
_
O
U
T
COMP
&P
CR
/L
IN
PC
R/G/
B,H/
VS
ync
SCA
RT
R/G
/B
/F
B
COMP
Y/P
b/
Pr
CEC
MAIN
V/Y
/C
OUT
D/
A
Sy
n
th
e
s
is
Tu
n
e
r
ICL
3232
74LCX
157
DE
M
U
X
DE
M
U
X
COM
M
_
U
A
R
T_
T
X
C
O
MM_
U
A
R
T
_
R
X
UA
R
T
0
_
R
X
UA
R
T
1
_
R
X
UA
R
T
0
_
T
X
UA
R
T
1
_
T
X
RX/T
X
RX/T
X
D
E
B
U
G
_
U
A
R
T
_T
X
/RX
UA
R
T
0
_
T
X
/R
X
D
E
B
U
G
_
U
A
R
T
_T
X
/RX
1.
8V
2.
5V
3.
3V
1.
0V
2.
6V
3.
3V
1.
8V
1.
1.
8V
3.
3V
3.
3.
3V
5V5V
3.3
V
1.8
V
3.3
V
1.8
V
TM
D
S
CEC
Hsyn
c,
Vs
ync
,DE
RGB
24
Bit
LV
D
S
I2
S
P
C
R
/LI
N
COMP
R/L
IN
FE
_T
S
_D
A
T
A
Sound & V
ideo Signal
Sound Signal
V
ideo Signal
Etc. Signal
- 23 -
CORTEZ
Plus
SCL_EEPR/SDA_EEPR
IC701
24LC256
EEPROM
IC1400
CXA2069
IIC Line
MSTR0_SCL
MSTR0_SDA
SCL/SDA
IC1301
NTP300A
IC1300
MSP4450K
TU600
TUNER
(Analog)
IC702
M62320
IC1000
SIL9125
HDMI Receiver
SCL/SDA
VGA0_SCL
VGA0_SDA
STI7101
+3.3V
IC304
24LC256
EEPROM
PIO4_0/SSC2_SCL
PIO4_1/SSC2_MRST/
SSC2_MTSR
I2C_SCL1/I2C_SDA1
4.7K
‰
3.3V_CTZ
4.7K
‰
MSTR1_SCL
MSTR1_SDA
P_3.3V
4.7K
‰
MSTR2_SCL
MSTR2_SDA
5.0V
4.7K
‰
SCL_5V/SDA_5
V
SCL_5V/SDA_5V
SCL_5V/SDA_5V
SW_TU_SCL/SW_TU_SDA
5V_TU
6.2K
‰
TU600
TUNER
(DIGITAL)
MODULE
SCL/SDA
- 24 -
EXPLODED VIEW
307
120
121
306
560
570
332
310
330
331
302
202
205
591
590
240
910
250
580
204
203
303
305
300
304
301
200
206
201
280
290
230
520
270
260
400
900
901
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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