DOWNLOAD LG 42LG61 (CHASSIS:LA84B) Service Manual ↓ Size: 9.85 MB | Pages: 44 in PDF or view online for FREE

Model
42LG61 (CHASSIS:LA84B)
Pages
44
Size
9.85 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lg61-chassis-la84b.pdf
Date
PREV: LG 42LG60FR / 42LG64FR (CHASSIS:LP81A) Service Manual

LG 42LG61 (CHASSIS:LA84B) Service Manual ▷ View online

- 21 -
Ch
eck JK
700,
JK70
2.
Can
 y
o
u
 see t
h
e n
o
rmal 
w
a
v
e
fo
rm?
JK70
0,JK7
02 
ma
y
 h
a
v
e
 p
ro
b
lem. Rep
lace th
is Jack.
Ch
eck th
e in
pu
t (Pin 
A
L
21,
A
M
2
1
,A
N
2
1 a
n
d
 Pin
A
N
2
2
,A
L
22,
A
P
22)
o
f BCM3553(I
C100).
Measu
re 
w
a
v
e
fo
rm at C638,
C639,C
640 an
d
 C628,C629,C630
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
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
t.
Ch
eck all p
o
w
e
r d
o
m
ain
 o
f 
FRC-945
9M (IC100
0)
(3.3V, 1.3V_C
ORE,1.3V_PL
L
,3.3V,1.8V,2.5V) 
& cr
y
s
tal output (X1000 / 20.25MHz)&FR
C_RESET
Measu
re Po
w
e
r & 
w
a
v
e
fo
rm
 at L
1008,L
1007,L
1002,L
1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
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
This board ha
s big 
problem
 because FR
C chip(FRC-9459M) hav
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 
FRC-945
9M.
A
lthough y
ou 
replace it, y
ou cannot see no
rmal display
, decide to replace 
M
a
in
 c
h
ip
(B
C
M
3553
)
YES
Component
- 22 -
Ch
eck JK
705.
Can
 y
o
u
 see t
h
e n
o
rmal 
w
a
v
e
fo
rm?
YES
JK70
5 ma
y
 h
a
v
e
 p
ro
b
lem. R
e
p
lace th
is Jack.
NO
Ch
eck th
e in
pu
t (Pin 
A
K
16,A
N
1
5,
A
M
15,
A
H16,
A
J
16)
o
f BCM355x(I
C100).
Measu
re 
w
a
v
e
fo
rm at C635,
C636,C
637 an
d
 R755,R758
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?
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
t.
Ch
eck all p
o
w
e
r d
o
m
ain
 o
f 
FRC-945
9M (IC100
0)
(3.3V, 1.3V_C
ORE,1.3V_PL
L
,3.3V,1.8V,2.5V) 
& cr
y
s
tal output (X1000 / 20.25MHz)&FR
C_RESET
Measu
re Po
w
e
r & 
w
a
v
e
fo
rm
 at L
1008,L
1007,L
1002,L
1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
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
This board ha
s big 
problem
 because FR
C chip(FRC-9459M) hav
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 
FRC-945
9M.
A
lthough y
ou 
replace it, y
ou cannot see no
rmal display
, decide to replace 
M
a
in
 c
h
ip
(B
C
M
3553
)
YES
RGB PC
- 23 -
Check input c
onnect JK600,
JK601,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, 
IC603, 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 
or
 TMDS1
4
1
H
A
R(
IC
7
0
3)
_HDMI4
. 
. 
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
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
t.
Ch
eck all p
o
w
e
r d
o
m
ain
 o
f 
FRC-945
9M (IC100
0)
(3.3V, 1.3V_C
ORE,1.3V_PL
L
,3.3V,1.8V,2.5V) 
& cr
y
s
tal output (X1000 / 20.25MHz)&FR
C_RESET
Measu
re Po
w
e
r & 
w
a
v
e
fo
rm
 at L
1008,L
1007,L
1002,L
1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
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
This board ha
s big 
problem
 because FR
C chip(FRC-9459M) hav
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 
FRC-945
9M.
A
lthough y
ou 
replace it, y
ou cannot see no
rmal display
, decide to replace 
M
a
in
 c
h
ip
(B
C
M
3553
)
YES
HDMI
- 24 -
A
T
/NT Tune
r
BCM3553
SIF
IF_V
SB/
QAM
SD_
S
IF1
ED
S
A
FE_I
F_
N
ED
S
A
FE_IF_P
PI
3HDMI
3
4
1
ART
HDMI0
HDMI_RX
_
0
_
CL
K_N
HDMI_RX
_
0
_
CL
K_P
H
D
M
I_
R
X_0_
D
A
T
A
0_N
H
D
M
I_
R
X_0_
D
A
T
A
0_P
H
D
M
I_
R
X_0_
D
A
T
A
1_N
H
D
M
I_
R
X_0_
D
A
T
A
1_P
H
D
M
I_
R
X_0_
D
A
T
A
2_N
H
D
M
I_
R
X_0_
D
A
T
A
2_P
C
S
5345
(Audio SW
&A/D&AMP)
AV
1
COMP
1
COMP
2
RGB
I2
S_
C
L
K_I
N
I2
S_
D
A
T
A
_I
N
I2
S_
L
R
_I
N
I2
S_
C
L
K_O
U
T
I2
S_
D
A
T
A
_OU
T
I2
S_
L
R
_O
U
T
N
T
P3000
(D-AMP)
A
UD_
SPD
IF
buffer
SPDIF out
C
o
axia
l o
u
t
A
U
D
_
LE
FT
_P
A
UD_
R
IG
H
T_P
MNT out
TMD
S
141H
AR
HDMI_RX
_
1
_
CL
K_N
HDMI_RX
_
1
_
CL
K_P
H
D
M
I_
R
X_1_
D
A
T
A
0_N
H
D
M
I_
R
X_1_
D
A
T
A
0_P
H
D
M
I_
R
X_1_
D
A
T
A
1_N
H
D
M
I_
R
X_1_
D
A
T
A
1_P
H
D
M
I_
R
X_1_
D
A
T
A
2_N
H
D
M
I_
R
X_1_
D
A
T
A
2_P
HDMI1
HDMI4
TPA3005
D2
PHPR
G
4
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