Read LG 47LB5DF (CHASSIS:LA75A) Service Manual online
- 20 -
Component doesn
t display
Ch
eck JP7
001
,J7015.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
Ch
eck th
e L
7
00, L
704.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
Ch
eck th
e C638, C628 in
fro
n
t o
f BCM35
53.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
YE
S
YE
S
NO
JK70
0, JK70
2 ma
y
h
a
v
e
p
ro
b
lem. Rep
lace th
is
Jack.
NO
Rep
lace th
e Part (L
700, L
7
04)
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
suspect that PCB is b
a
d
.
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.
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