DOWNLOAD LG 32LC7D (CHASSIS:LA73E) Service Manual ↓ Size: 14.71 MB | Pages: 45 in PDF or view online for FREE

Model
32LC7D (CHASSIS:LA73E)
Pages
45
Size
14.71 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32lc7d-chassis-la73e.pdf
Date
PREV: LG 32LC7D / 32LC55 / 32LC56 (CHASSIS:LD73A) Service Manual

LG 32LC7D (CHASSIS:LA73E) Service Manual ▷ View online

- 37 -
- TV/CATV doesn't display
Check TU4001 Pin9(Video 
output)
Can y
o
u see t
h
e n
o
rmal sign
al?
Check the input(Pin63) of 
A
V 
s
w
itch(IC5003).
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
Check the output(Pin56) of
 A
V
 
s
w
itch(IC5003).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check the input(Pin1) of
 LP
F(IC4006).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
YE
S
YE
S
NO
Could y
ou measure 
v
o
ltage of TU4001 & 
IIC lines?
A
re they
 all normal?
Check the output(Pin8) 
of LPF(IC4006).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
Check the input(PinH26) of 
BCM35
50(IC4
006).
Measu
re w
a
v
e
form at C101
0
 b
ecau
se it
s 
more easy
 to 
check.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
NO
You should check po
w
e
r 
line 
& IIC li
nes.
YE
S
You should replace TUNER.
NO
A
ft
e
r checking the Po
w
e
r 
of 
A
V
 s
w
itch y
ou 
should decide
 to replace 
A
V
 s
w
itch or 
not.
NO
A
ft
e
r checking the Po
w
e
r 
of 
A
V
 s
w
itch y
ou 
should decide
 to replace 
A
V
 s
w
itch or 
not.
NO
A
fte
r checking the
 Po
w
e
r 
o
f LPF y
ou sho
u
ld 
decide to replace LPF  or not.
NO
A
fte
r checking the
 Po
w
e
r 
o
f LPF y
ou sho
u
ld 
decide to replace LPF  or not.
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
- 38 -
- Video doesn't display
Check J5007 Pin3C
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
Check the input(Pin1 or Pin8) of 
A
V 
s
w
itch(IC5003
). Pin
1 
is for 
v
ideo1,Pin8 
is 
for v
ideo 
2.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check the output(Pin56) of
 A
V
 
s
w
itch(IC5003).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check the input(Pin1) of
 LP
F(IC4006).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
YE
S
YE
S
NO
J5007 may
 hav
e
 problem. Replace this 
Jack.
Check the output(Pin8) 
of LPF(IC4006).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
Check the input(PinH26) of 
BCM35
50(IC4
006).
Measu
re w
a
v
e
form at C101
0
 b
ecau
se it
s 
more easy
 to 
check.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
NO
A
ft
e
r checking the Po
w
e
r 
of 
A
V
 s
w
itch y
ou 
should decide
 to replace 
A
V
 s
w
itch or 
not.
NO
A
ft
e
r checking the Po
w
e
r 
of 
A
V
 s
w
itch y
ou 
should decide
 to replace 
A
V
 s
w
itch or 
not.
NO
A
fte
r checking the
 Po
w
e
r 
o
f LPF y
ou sho
u
ld 
decide to replace LPF  or not.
NO
A
fte
r checking the
 Po
w
e
r 
o
f LPF y
ou sho
u
ld 
decide to replace LPF  or not.
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
- 39 -
- Component doesn't display
Ch
eck J5
004,
J500
5.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check the input of Component 
s
w
itch(IC5001,IC5002). 
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
Check th
e o
u
tput o
f Co
mponent 
s
w
itch(IC5001,IC5002). 
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check th
e in
put o
f MST
3361
(IC7004 
Pin41,44,46).
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
YE
S
YE
S
NO
J5004,J5005 
may
 ha
v
e
 pro
b
lem. Replace this 
Jack.
Check the output of
 MST3361(IC7004 ).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
Check th
e in
put an
d 
output of 
BCM3550(IC4006). Especially
 y
ou should 
ch
eck
The
 H,V sy
nc and clock.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
NO
A
fter checking the i
nput
 TR
 of compo
nen
t, y
ou 
should decide
 to replace component s
w
it
ch or 
not.
NO
NO
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of MST
3361 
y
ou 
should decide
 to replace MST3361 or not.
NO
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
A
fter checking the Po
w
e
r o
f component s
w
itch
 
y
ou should 
decide to replace component s
w
itch 
or not.
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of MST
3361 
y
ou 
should decide
 to replace MST3361 or not.
- 40 -
- RGB_PC doesn't display
Check input c
onnect P7004.
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
Check the input of Component 
s
w
itch(IC5002). 
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
Check th
e o
u
tput o
f Co
mponent 
s
w
itch(IC5002). 
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
Check th
e in
put o
f MST
3361
(IC7004 
Pin41,44,46).
Can y
o
u see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
YE
S
YE
S
NO
P7004  may
 h
a
v
e
 problem. Replace this Jack.
Check the output of
 MST3361(IC7004 ).
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
Check th
e in
put an
d 
output of 
BCM3550(IC4006). Especially
 y
ou should 
ch
eck
The
 H,V sy
nc and clock.
Can y
ou see t
h
e n
o
rmal 
w
a
v
e
form?
YE
S
NO
A
fter checking the i
nput
 TR
 of RGBHV, y
ou 
should decide
 to replace these components or 
not.
NO
NO
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of MST
3361 
y
ou 
should decide
 to replace MST3361 or not.
NO
YE
X
This board ha
s big 
problem
 because Main 
chip(BCM3
550) 
hav
e some trouble
s.
A
fter checking thorough
ly
 all path 
once 
again, 
You should decide to replace BCM3550 o
r not.
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of RGB s
w
itch
 y
ou 
should decide
 to replace component s
w
it
ch or 
not.
A
ft
e
r ch
ec
kin
g th
e Po
w
e
r of MST
3361 
y
ou 
should decide
 to replace MST3361 or not.
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