LG 37LG60 (CHASSIS:LA84B) Service Manual ▷ View online
- 17 -
TROUBLESHOOTING
A
T
/NT Tune
r
BCM3553
F
M
S6400
CVB
S
IF_V
SB/
QAM
SD_CVBS
1
ED
S
A
FE_I
F_
N
ED
S
A
FE_I
F_P
AV
1
SD_CVBS
3
Component1
SD_
Y
1
SD_PR1
SD_PB1
Component2
SD_
Y
2
SD_PR2
SD_PB2
RGB
SD_R
SD_
G
SD_B
RGB
_HS
YNC
RGB
_V
S
Y
NC
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
L
V
D
S
_T
X_0_
D
A
T
A
_0_N
L
V
D
S
_T
X_0_
D
A
T
A
_0_P
L
V
D
S
_T
X_0_
D
A
T
A
_1_N
L
V
D
S
_T
X_0_
D
A
T
A
_1_P
L
V
D
S
_T
X_0_
D
A
T
A
_2_N
L
V
D
S
_T
X_0_
D
A
T
A
_2_P
L
V
D
S
_T
X_0_
D
A
T
A
_3_N
L
V
D
S
_T
X_0_
D
A
T
A
_3_P
L
V
D
S
_T
X_0_
D
A
T
A
_4_N
L
V
D
S
_T
X_0_
D
A
T
A
_4_P
L
V
D
S
_T
X_1_
D
A
T
A
_0_N
L
V
D
S
_T
X_1_
D
A
T
A
_0_P
L
V
D
S
_T
X_1_
D
A
T
A
_1_N
L
V
D
S
_T
X_1_
D
A
T
A
_1_P
L
V
D
S
_T
X_1_
D
A
T
A
_2_N
L
V
D
S
_T
X_1_
D
A
T
A
_2_P
L
V
D
S
_T
X_1_
D
A
T
A
_3_N
L
V
D
S
_T
X_1_
D
A
T
A
_3_P
L
V
D
S
_T
X_1_
D
A
T
A
_4_N
L
V
D
S
_T
X_1_
D
A
T
A
_4_P
LVDS
_
T
X
_
0
_CL
K_N
LVDS
_
T
X
_
0
_
CL
K_P
LVDS
_
T
X
_
1
_CL
K_N
LVDS
_
T
X
_
1
_
CL
K_P
LVDS
T
M
D
S
141H
AR
F
R
C
-9459
M
LVDS( Module )
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
- 18 -
Check TU1 Pin16(Video out
put)
Can y
o
u see t
h
e n
o
rmal sign
al?
Check the input(Pin1) of
LP
F(IC808).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
Could y
o
u measu
re
v
o
ltag
e o
f T
U
1 & IIC lin
es?
A
re they
all normal?
Check the output(Pin8)
of LPF(IC808).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
Check the input(Pin
A
N
16) o
f BCM3553(IC
100).
Measure
w
a
v
e
form at C658
because it
ís more easy
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
NO
You should check po
w
e
r
line
& IIC li
nes.
YES
You should replace TUNER.
NO
A
ft
e
r checking
v
ideo signal line & the Pow
e
r of
LPF y
o
u should
decide to replace item or not.
NO
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of L
P
F y
ou sh
ou
ld
decid
e to
replace L
P
F
o
r n
o
t.
This board ha
s big
problem
because Main chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once ag
ain
, You
sho
uld d
ecid
e
to rep
lace BCM
3553 o
r n
o
t.
YES
YES
NO
Check all po
w
e
r domain of
FRC-9459M (IC1000)
(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
Measure Po
w
e
r &
w
a
v
e
for
m
at L1008,L1007,L1002,L1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
becau
se it
ís more easy
to
check.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
This board ha
s big
problem
because FRC chip(FRC-9459M) hav
e
some troubles.
A
ft
e
r checking thoroughly
all path
once
again, You should decide
to replace
FRC-945
9M.
A
lthough y
ou
replace it, y
ou cannot see normal display
, decide to replace
Main chip(BC
M3553)
YES
TA/CATV
- 19 -
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
3553(IC100).
Measure
w
a
v
e
form at C651,
C652 b
e
c
a
use
it
ís mo
re eas
y
to
ch
eck.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
NO
YES
This board ha
s big
problem
because Main chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once ag
ain
, You
sho
uld d
ecid
e
to rep
lace BCM
3553 o
r n
o
t.
Check all p
o
w
e
r d
o
main
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
Measure Po
w
e
r &
w
a
v
e
for
m
at L1008,L1007,L1002,L1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
becau
se it
ís more easy
to
check.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
This board ha
s big
problem
because FRC chip(FRC-9459M) hav
e
some troubles.
A
ft
e
r checking thoroughly
all path
once
again, You should decide
to replace
FRC-945
9M.
A
lthough y
ou
replace it, y
ou cannot see normal display
, decide to replace
M
a
in
c
h
ip
(B
C
M
3553
)
YES
AV
- 20 -
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
nd Pin
A
N
2
2
,A
L22,
A
P
22)
of BCM3553(I
C100).
Measure
w
a
v
e
form at C638,
C639,C
640 an
d C628,C629,C630
becau
se it
ís more easy
to
check.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
NO
This board ha
s big
problem
because Main chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once ag
ain
, You
sho
uld d
ecid
e
to rep
lace BCM
3553 o
r n
o
t.
Check all p
o
w
e
r d
o
main
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
Measure Po
w
e
r &
w
a
v
e
for
m
at L1008,L1007,L1002,L1013,
L
1014,L
101
5~
L
1018&
C10
06
&R10
29
becau
se it
ís more easy
to
check.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
This board ha
s big
problem
because FRC chip(FRC-9459M) hav
e
some troubles.
A
ft
e
r checking thoroughly
all path
once
again, You should decide
to replace
FRC-945
9M.
A
lthough y
ou
replace it, y
ou cannot see normal display
, decide to replace
M
a
in
c
h
ip
(B
C
M
3553
)
YES
Component
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