LG 37LC7D (CHASSIS:LA73E) Service Manual ▷ View online
- 41 -
- 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
o
u 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
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
Check th
e in
pu
t an
d
outpu
t of
BCM3550(IC4006). Especially
y
ou should
ch
eck
The
H,V sy
nc and clock.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
NO
A
fte
r 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.
- 42 -
- HDMI doesn't display
Check input c
onnect P7007.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
Check DDC commu
nication lines(IC7013
Pin5,6)
Check th
e in
pu
t o
f MST
3361
(IC7004)
This signal is
TMDS.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
YE
S
NO
P7007 may
hav
e
problem. Replace this Jack.
Check the output of
MST3361(IC7004 ).
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
Check th
e in
pu
t an
d
outpu
t of
BCM3550(IC4006). Especially
y
ou should
ch
eck
The
H,V sy
nc and clock.
Can y
o
u see t
h
e n
o
rmal
w
a
v
e
form?
YE
S
NO
NO
A
ft
e
r ch
ec
kin
g th
e trace o
f
TMDS lin
es a
n
d po
w
e
r o
f
MST3361, 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 checking the Po
w
e
r
of this chip, y
ou
should decide
to replace this 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.
YE
S
Check HD
CP co
mmunicatio
n lin
es(IC7005
Pin5,6)
NO
A
ft
e
r checking the Po
w
e
r
of this chip, y
ou
should decide
to replace this or not.
- 43 -
EXPLODED VIEW
300
200
310
500
510
120
820
801
802
803
800
804
600
610
530
400
810
840
900
807
830
808
805
806
816
815
809
200T
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts
are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as recommended
in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
Click on the first or last page to see other 37LC7D (CHASSIS:LA73E) service manuals if exist.