LG 52LG72-UA (CHASSIS:LA86B) Service Manual ▷ View online
- 25 -
C
2008
Check JK701, JK707
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
NO
JK701,JK707
may
ha
v
e
pro
b
lem. Replace this Jack.
Check the input (Pin
A
N
17,A
M
1
9) of BCM
355x(IC100).
Measu
re w
a
v
e
fo
rm at C651,
C652 b
e
c
a
use
itís mo
re easy to
ch
eck.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
AV
YES
Video
- 26 -
C
2008
Ch
eck JK
700,
JK70
2.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
JK700,JK702
may
ha
v
e
pro
b
lem. Replace this Jack.
Check th
e in
put (Pin
A
L
21,
A
M
2
1
,A
N
2
1 a
n
d Pin
A
N
2
2
,A
L22,
A
P
22)
of BCM355x(I
C100).
Measure
w
a
v
e
form at C638,
C639,C
640 an
d C628,C629,C630
becau
se itís mo
re eas
y
to
check.
Can
y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
C
omponent
YES
YE
S
NO
Video
- 27 -
C
2008
R
GB PC
Ch
eck JK
705.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
JK70
5 ma
y
h
a
v
e
p
roblem. R
e
place th
is Jack.
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
YE
S
NO
Check the input (Pin
A
K
16,A
N
1
5,
A
M
15,
A
H16,
A
J
16)
of BCM355x(I
C100).
Measure
w
a
v
e
form at C635,
C636,C
637 an
d R755,R758
becau
se itís mo
re eas
y
to
check.
Can
y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
Video
- 28 -
C
2008
HDMI
Check input c
onnect
JK600,JK601,
JK602,JK708
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
Check DDC communication lines
(IC601, IC602,I
C603, IC701)
JK60
0,JK6
01,
JK70
8 ma
y
h
a
v
e
p
roblem. R
e
place th
is Jack.
Check the output of
PI3HDMI341
A
T
R(IC600).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
A
ft
e
r checking the Po
w
e
r
of this chip, y
ou should
decide to replace this or not.
Check HD
CP co
mmunicatio
n lin
es(IC102)
A
ft
e
r checking the Po
w
e
r
of this chip, y
ou should
decide to replace this or not.
YES
YES
YES
NO
NO
NO
YES
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
Video
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