LG 42LG61 (CHASSIS:LA84B) Service Manual ▷ View online
- 25 -
Ch
eck T
U
1 Pin
14(SIF)
Can
y
o
u
see t
h
e n
o
rmal sign
al?
Ch
eck th
e in
pu
t (Pin
A
N
23) o
f BCM3553((I
C100).
Measu
re
w
a
v
e
fo
rm at C665
b
ecau
se it
ís
mo
re eas
y
to
ch
eck.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
YES
NO
Co
u
ld
y
o
u
measu
re
v
o
ltag
e o
f T
U
1 & IIC
lin
es?
A
re they
all normal?
NO
Yo
u
sh
ou
ld ch
eck p
o
w
e
r
lin
e
& IIC li
nes.
YES
Yo
u
sh
ou
ld rep
lace T
UNER.
NO
A
ft
e
r ch
ec
kin
g
au
d
io
sign
al lin
e, y
o
u
sh
ou
ld
d
ecid
e to
rep
lace item o
r n
o
t.
TV/CATV
- 26 -
Ch
eck JK
701,
JK70
7, JK70
0, JK702, JK
703
.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
JK70
1, JK70
7, JK700, JK
702, JK703 ma
y
h
a
v
e
p
ro
b
lem. Rep
lace th
is
Jack.
Ch
eck th
e in
pu
t (Pin
A
IN
6
A
,
A
IN6
B
,A
IN1
A
,A
IN1
B,
A
IN3
A
,A
IN3
B,
A
IN
4
A
,A
IN4
B
,A
IN2
A
,A
IN2
B
) o
f CS5345(IC
500).
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
YES
A
ft
e
r ch
ec
kin
g
au
d
io
sign
al lin
e, y
o
u
sh
ou
ld
d
ecid
e to
rep
lace item o
r n
o
t.
YES
Check the Output (Pin SDOU
T,SCLK,LRCK) of CS5345(I
C500).
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
A
ft
e
r ch
ec
kin
g
th
e Po
w
e
r &
ML
CK & rese
t o
f this ch
ip,
y
ou should
decide to replace this or not.
YES
Ch
eck th
e in
pu
t (Pin
A
H
24,A
J
2
4,
A
K
24) o
f BCM355
3((IC100).
Measu
re
w
a
v
e
fo
rm at R554,
R561,R
555 b
e
cau
se it
ís
mo
re
eas
y
to
ch
e
ck.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
A
ft
e
r ch
ec
kin
g
au
d
io
sign
al lin
e, y
o
u
sh
ou
ld
d
ecid
e to
rep
lace item o
r n
o
t.
AV/Component/RGB-PC
- 27 -
Check input c
onnect JK
600,
JK601,JK602,
JK708
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
Ch
eck DD
C c
o
mmu
n
ication
lin
es
(IC601, IC602,I
C603, IC701)
JK60
0,JK6
01,
JK70
8 ma
y
h
a
v
e
p
ro
b
lem. R
e
p
lace th
is Jack.
Ch
eck th
e o
u
tp
u
t o
f PI3HDMI341
A
T
R(IC600)_HDMI1/2/3
o
r TMDS141H
A
R
(I
C703)_H
D
M
I4.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
A
ft
e
r ch
ec
kin
g
th
e Po
w
e
r
of th
is ch
ip
, y
o
u
sh
o
u
ld
d
ecid
e to
rep
lace th
is o
r no
t.
Ch
eck HD
CP co
mmu
n
icatio
n
lin
es(IC102)
A
ft
e
r ch
ec
kin
g
th
e Po
w
e
r
of th
is ch
ip
, y
o
u
sh
o
u
ld
d
ecid
e to
rep
lace th
is o
r no
t.
YES
YES
YES
NO
NO
NO
NO
A
ft
e
r ch
ec
kin
g
th
e Po
w
e
r &
Select Pin
&
Etc o
f th
is chip
, y
o
u
sh
o
u
ld
d
ecid
e to
rep
lace th
is o
r n
o
t.
HDMI
- 28 -
Ch
eck th
e o
u
tp
u
t (Pin
A
K
25
,A
L
25,
A
J
25) o
f BCM355
3(IC
100).
Measu
re
w
a
v
e
fo
rm at R263
5
,R2636,R
263
7 b
ecau
se it
ís
mo
re eas
y
to
ch
eck.
Can
y
o
u
see t
h
e n
o
rmal sign
al?
Ch
eck th
e in
pu
t (Pin 17,18,19) o
f NTP3000((IC501).
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
YES
NO
NO
This board ha
s big
problem
because Ma
in chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g
th
o
rou
g
h
ly
all p
a
th
o
n
ce
ag
ain
, You
sho
u
ld d
ecid
e
to rep
lace BCM
3553 o
r n
o
A
ft
e
r ch
ec
kin
g
au
d
io
sign
al lin
e, y
o
u
sh
ou
ld
d
ecid
e to
rep
lace item o
r n
o
t.
YES
Ch
eck th
e o
u
tp
u
t (Pin
30,31,36,37,47,
48,53,54) o
f NTP3000((IC501).
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
YES
A
ft
e
r ch
ec
kin
g
th
e Po
w
e
r &
I2C & Reset o
f th
is ch
ip
, y
o
u
sh
o
u
ld
d
ecid
e to
rep
lace th
is o
r n
o
Ch
eck th
e sp
e
aker o
u
tp
u
t
w
a
fer P50
1.
Can
y
o
u
see t
h
e n
o
rmal
w
a
v
e
fo
rm?
NO
YES
A
ft
e
r ch
ec
kin
g
au
d
io
sign
al lin
e, y
o
u
sh
ou
ld
d
ecid
e to
rep
lace item o
r n
o
t.
Check the connector & Speaker
* If
conditio
n
of sta
rting
sound i
s
ab
nomal
, y
ou
hav
e to
ch
ec
k
IC1000(TP
A3
005).
Speaker
Click on the first or last page to see other 42LG61 (CHASSIS:LA84B) service manuals if exist.