Read LG 42LB1R (CHASSIS:LP7BA) Service Manual online
- 24 -
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)
Do
wn
load
EDID
da
ta each po
rt.
1.
Check
T
V
input mode.
(H
DM
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
aud
io fr
o
m
phone jac
k
,
You
can hear
PC
audio
.
)
2.
Un
pl
u
g
a
n
d
plu
g
HDMI ca
bl
e.
(s
om
etimes
ESD
su
rge
occu
rr
ed a
t
HD
MI po
rt.)
3.
Ch
e
c
k HDMI Mut
e
re
gi
ster.
(0x
6
8,
o
ff
s
et
0x
3
7
)
4.
Check
Audio
-
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
.
Ch
eck
HD
MI
sou
rc
e
. Chan
ge anothe
r
so
u
rce
o
r cab
le
.
Is
wa
ve continuous?
1.
Check
H
D
MI r
e
ce
ive
r’
s
s
ta
tus
reg
is
te
r.
(
0
x60,
o
ffset
0
x
06)
-
If t
h
e v
a
lu
e
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
na
bl
e
bit 5: HDCP de
c
ry
p
ti
o
n
a
c
tiv
e
-E
na
bl
e
bit 4: HDCP aut
he
n
. att
e
m
pt
e
d
No
No
Re
pl
ace IC12
00
Re
set
T
M
D
S
powe
r
down
/on
reg
iste
r.
-0
x6
0,
of
fse
t 0x
3f
: 0xf
7
=>
0xff
Yes
Yes
No
rm
al
video
,
No
rm
a
l
aud
io
?
Yes
No
19. HDMI mode
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