Read LG 47LB5DF (CHASSIS:LA75A) Service Manual online
- 19 -
Video doesn
t display
Ch
eck JP7
004
.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
Ch
eck th
e L
o
w
-p
ass Filter(L
703).
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
YE
S
YE
S
NO
JK70
1 ma
y
h
a
v
e
p
ro
b
lem. R
e
p
lace th
is
Jack.
Ch
eck th
e C6
51 in
fro
n
t
o
f
BCM35
53 ch
ip
.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
rep
lace Part(L
703).
YE
S
Th
is
bo
ard
h
a
s b
ig
p
ro
b
lem
b
ecau
se Main
c
h
ip(BCM3
553)
hav
e s
o
me
trouble
s
.
A
fte
r c
h
ec
k
ing thoro
ugh
ly
all pa
th
onc
e
ag
ai
n,
Yo
u
sh
ou
ld decid
e to
rep
lace BCM3
553 o
r
n
o
t.
NO
A
ft
e
r ch
ec
k th
e p
a
ttern
b
e
tw
een
L
703 an
d
C651,
Yo
u
can
su
spect that PCB is b
a
d
.
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