ViewSonic VX2240W-4, Service Manual

Page: 26 / 53

23
8. Schematic Diagrams
Main board
TOP
+5V
M
U
TE
A
M
P
_
S
HDN
V
O
L_
P
WM
SPK_R+
SPK_R-
SPK_L+
SPK_L-
R
X
2-
B3
03_SCALER
B
_
D
[0
..
1
9]
F
_
D
[0
..
1
9]
B
S
T
HI
F
S
T
HI
OE
P
OL
S
TV
G
V
ON
S
TB
C
KV
IN
V
_
O
N
/O
FF
IN
V
_
A
DJ
P
A
N
E
L_
ON
V
C
M
_
PWM
V
G
A
_
S
CL
V
G
A
_
S
DA
V
S
IN
H
S
IN
S
OGI B
I1-
B
I1
G
I1-
G
I1
R
I1
R
I1-
L
E
D
_
O
RG
L
E
D
_
G
RN
M
E
NU
PW
R
_
SW
M
U
TE
A
M
P
_
S
HDN
V
O
L
_
PWM
D
V
DD
V
G
A
_
3
V3
M
C
U
_
V
DD
A
DC
_
V
AA
R
X
2-
R
X
2+
R
X
1-
R
X
1+
R
X
0-
R
X
0+
R
X
C-
R
X
C+
D
V
I_
H
PD
D
V
I_
S
CL
D
V
I_
S
DA
S
O
URC
E
_
S
E
L
E
CT
K
E
Y
_
UP
K
E
Y
_
D
O
WN
A
U
T
O
_
A
DJ
V
33S
C
V
DD
1
V8
B4
04_INTERFACE
IN
V
_
A
DJ
IN
V
_
O
N
/O
FF
M
E
NU
PW
R
_
SW
L
E
D
_
O
RG
L
E
D
_
G
RN
S
TV
C
KV
OE S
TB
P
OL
F
S
T
HI
F
_
D
[0
..
1
9]
B
_
D
[0
..
1
9]
P
A
N
E
L
_
ON
V
C
M
_
P
WM
G
V
ON
B
S
T
HI
SPK_R-
SPK_R+
SPK_L+
SPK_L-
+
5V
D
V
DD
V
G
A
_3
V3
ADC_VAA
M
C
U
_
V
DD
LIPS_5V
K
E
Y
_
UP
K
E
Y
_
D
O
WN
A
U
T
O
_
A
DJ
S
O
URC
E
_
S
E
L
E
CT
V
3
3S
C
V
DD
1
V8
B1
02_VGA
R
I1
R
I1-
S
OGI
G
I1-
B
I1
B
I1-
G
I1
H
S
IN
V
S
IN
V
G
A
_
S
DA
V
G
A
_
S
CL
+
5V
ADC_VAA
R
X
2+
IN
V
_
O
N
/O
FF
IN
V
_
A
DJ
PW
R
_
SW
M
E
NU
L
E
D
_
G
RN
L
E
D
_
O
RG
S
TB
P
OL
S
TV
OE C
KV
R
X
1-
V
C
M
_
P
WM
G
V
ON
F
S
T
HI
P
A
N
E
L
_
ON
F
_
D
[0
..
1
9]
B
_
D
[0
..
1
9]
B
S
T
HI
R
X
1+
B
I1
R
I1
G
I1
R
I1-
B
I1-
H
S
IN
V
S
IN
M
C
U
_
V
DD
V
G
A
_
S
DA
R
X
0-
S
OGI
R
X
0+
R
X
C-
R
X
C+
D
V
I_
S
CL
D
V
I_
S
DA
D
V
I_
H
PD
C
V
DD
1
V8
K
E
Y
_
UP
D
V
DD
A
DC
_
V
AA
K
E
Y
_
D
O
WN
V
G
A
_3
V3
A
U
T
O
_
A
DJ
S
O
URC
E
_
S
E
L
E
CT
LIPS_5V
V
G
A
_
S
CL
B5
05_AUDIO
M
U
TE
A
M
P
_
S
H
DN
V
O
L
_
PWM
SPK_L-
SPK_L+
SPK_R-
SPK_R+
LIPS_5V
G
I1-
B6
06_DVI
R
X
2-
R
X
2+
R
X
1-
R
X
1+
R
X
0-
R
X
0+
R
X
C-
R
X
C+
D
V
I_
H
PD
D
V
I_
S
CL
D
V
I_
S
DA
ADC_VAA
+5V
CVDD1V8
V
3
3S