Read LG 42LB9RTA (CHASSIS:LP7BB) Service Manual online
- 23 -
No
Is
no
rm
a
l
on
ly
video
?
Is
no
rm
a
l
on
ly
aud
io?
C
heck
T
M
D
S
line
wa
ve.
(R
1215 ~ R1222/ R122
6 ~ R1233)
D
o
wn
load
EDID
da
ta each po
rt.
1
. Check
T
V
input mode.
(H
D
M
I1
por
t suppor
t
H
D
M
I and
D
V
I.
So
if you inpu
t D
V
I
s
igna
l
a
nd PC
a
u
d
io fr
o
m
phone jac
k
,
You can hear
PC
au
dio
.
)
2.
U
n
p
lug
a
n
d
plug
HDMI
c
a
b
le
.
(s
o
m
etimes
ESD
s
urge
occu
rr
ed
a
t
HD
MI
p
o
rt.)
3.
Ch
e
c
k
HDMI Mut
e
re
g
ister.
(0x
6
8,
o
ff
s
et
0x
3
7
)
4
. Check
A
udio
-
o
u
t chan
ne
l mu
te
reg
is
te
r
(0
x68
,
o
ffse
t
0
x
32)
is
approp
ri
a
te
ly enabled
.
C
h
eck
H
D
MI
sour
c
e
. Chan
ge anothe
r
so
ur
c
e
o
r cab
le
.
Is
wa
ve continuous?
1
. Check
H
D
MI r
e
c
e
ive
r'
s
s
ta
tus
reg
is
te
r.
(
0
x60,
o
ffset
0
x
06)
-
If t
h
e
v
a
lue
is
0xf
or
0x
8, it i
s
n
o
rm
al.
2
. Check
H
D
C
P
reg
iste
r.
(0
x60,
o
ffset
0x32
)
-
E
nabl
e
bit
6:
HDCP
key
loaded
-
E
n
a
b
le
bit
5:
HDCP
d
e
c
ry
p
tio
n
a
c
tiv
e
-
E
n
a
b
le
bit
4:
HDCP
a
ut
h
e
n
.
att
e
m
p
te
d
No
No
R
e
p
lace IC12
00
R
e
set
T
M
D
S
powe
r
down
/on
reg
iste
r
.
-
0
x
6
0
,
o
ffse
t
0x
3f
:
0xf
7
=>
0xff
Yes
Yes
N
o
rm
a
l video
,
No
rm
a
l
a
ud
io
?
Yes
No
19. HDMI mode
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