Read LG 47LB5DF (CHASSIS:LA75A) Service Manual online
- 21 -
Ch
eck JP7
032
, JP7033, JP70
34.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
Ch
eck th
e C6
35, C636, C6
37 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
NO
JK70
5 ma
y
h
a
v
e
p
ro
b
lem. R
e
p
lace th
is Jack.
NO
A
fte
r c
h
ec
k
the
pa
tte
rn be
tw
een
input
of
BCM35
53 an
d
JK705 ,
Yo
u
can
su
spect th
at PCB is bad
.
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.
RGB_PC doesn
t display
Ch
eck JP7
029
,JP7030.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
YE
S
NO
JK70
5 ma
y
h
a
v
e
p
ro
b
lem. R
e
p
lace th
is Jack.
YE
S
Ch
eck th
e R756, R759 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?
NO
A
fte
r c
h
ec
k
the
pa
tte
rn be
tw
een
input
of
BCM35
53 an
d
JK705 ,
Yo
u
can
su
spect th
at PCB is bad
.
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