LG 37LC2RHA / 37HIZ22 (CHASSIS:LP62F) Service Manual ▷ View online
- 21 -
(5) When set doesn't display normally at Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
Yes
Replace IC1200.
No
No
Is the IC1200
normal?
Replace IC800.
No
No
Is the IC800
normal?
Replace IC800.
No
No
Is the IC800
normal?
Is the
Input voltage, IIC
Communication and HV
sync normal?
Is the
Input voltage, IIC
Communication and HV
sync normal?
Is the
Input voltage, IIC
Communication and HV
sync normal?
2-4. In case of no sound
(1) Symptom
1) LED is White.
2) Screen existent, but Sound isn’t.
2) Screen existent, but Sound isn’t.
(2) Check follow
No
No
No
All input(mode)
is no sound?
Only HDMI is
no sound?
Only AV input
is no sound?
Replace IC400.
Replace IC401.
Replace IC300.
Replace VSC B/D.
Set on speaker in menu
Download the EDID data
Check the speaker cable
No
Only RF is
no sound?
no sound?
Check the Tuner In/Out.
No
No
No
Replace IC402.
No
Is the Speaker
on in Menu?
Yes
No
No
Check the signal after IC300 refer
to circuit diagram.
to circuit diagram.
Is the output
Lout1 & Vout1 of IC300
normal?
Yes
Yes
Yes
Yes
Is the speaker
cable normal?
cable normal?
Yes
Yes
Yes
Yes
IC400 operate
normally?
IC401 operate
normally?
IC402 operate
normally?
BLOCK DIAGRAM
- 22 -
Di
s
c
ret
e
I
R
RS
2
3
2
RG
B
(P
C
/D
T
V
)
PC
_
A
u
d
io
RF
IR
Co
rt
e
z
FLI
8
6
6
2
CX
A
2
06
9Q
Sw
it
c
h
TX
ST3
2
32
C
Rx 0
/1
Tx
0
/1
TXD
/
R
XD
74
H
C
1
4
DS
U
B
_
S
C
L
/ D
S
B
U
_S
D
A
DS
_
V
S
/
DS
_
H
S
VG
A
_
R
G
B
MS
P
4
4
50K
S/
W
&
C
O
N
T
R
O
L
PC
_
S
TE
R
E
O
A
U
D
IO
PC
_
A
u
d
io
_
L
/R
Tu
n
e
r
(W
3
0
3P
)
TU
_
M
A
IN
S I
F
AM
_
A
u
d
io
AM
_
A
u
d
io
/
S
I
F
AV
YC
IN
3
AV
IN
3
_
R
IN
/L
IN
CO
M
P
CO
M
P
_
Y
/P
b
/P
r
CO
M
P
_
R
IN
/L
IN
TV
_
L
/R
O
U
T
S-
A
V
CO
M
P
_
Y
/P
b
/P
r
AV
AV
IN
4
_
R
IN
/L
IN
T
PA3
1
0
0
AV
_
L
R
SU
B
_
V
o
r
Y/
C
O
U
T
MA
IN
_
V
o
r
Y/
C
O
U
T
31
P
_
L
V
D
S
Tx
0
/1/
2
/3/
4
/C
DI
S
P
_
E
N
SC
L
/SD
A
_
Pa
rt
HY
5
D
U
2
81
62
2E
T
P
DDR
R
A
M
(128
M
B
X
2
)
AT
4
9
B
V
160
C
F-
R
O
M
(2
M
B
)
V_
O
U
T
1
Y_I
N
1
L_
S
P
K
_
OU
T
L+
S
P
K
_
OU
T
I
2
S
24C
0
2
I
2
C
I
2
C
I
2
C
HD
M
I_
L
/R
RX
0
/1/
2
/C
L
K
–
HD
M
I
(P
C
/DT
V
)
SC
A
R
T
1
SC
A
R
T
2
SC
AR
T
1
, 2
_
R
IN
/L
IN
SC
A
R
T1
,
2_
ID
DS
_
V
S
/
D
S
_
H
S
SC
A
R
T_
R
G
B
/F
B
SC
A
R
T_
R
G
B
/F
B
SI
L
9
0
1
1
24
C
0
2
HDM
I
HDM
I
CO
M
P
_
R
IN
/LIN
SP
E
A
K
E
R
O
U
TP
U
T
(M
O
N
O)
Ex
t_
M
O
N
O
_
S
PK
_
O
U
T
R_
S
P
K
_
O
U
T
R+
S
P
K_
O
U
T
L/
R
S
o
u
n
d
1
RJ
4
5
Ex
t_
M
O
N
O
_
S
P
K
_
O
U
T
SC
L
/SD
A
T
PA0
2
4
2
Ex
t_
M
O
N
O
_
S
P
K
_
O
U
T
L/
R
S
o
u
n
d
2
M6
2
3
20
F
P
RJ
P
_
C
o
n
tr
o
l
I
2
C
NJ
U
2
69
01
I
2
S
LA7
2
17
Sy
n
c
d
e
te
c
t
Sy
n
c
d
e
te
c
t
I
2
S
MEMO
- 23 -
- 24 -
EXPLODED VIEW
300
200
800
810
81
1
530
510
500
820
120
520
540
830
610
600
840
400
900
910
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