ViewSonic VA520-2, Service Manual

Page: 28 / 77

2.0 mm
Audio_control_(NC)
B
C
E
Winbond ISP
FOR Winbond ISP
RESET
UP
SDA
TxD
RxD
SCL
SDA
PO
WER
P
DOWN
D
ENTER
E
MENU
M
U
SCL
MUTE
LED_GRN
LED_OR
LED_GRN
LED_OR
LED_GREEN
AMBER
Brightness
DC_EN1
DC_EN1
PWM1
GND
PWM1
TxD
RxD
SCL 2
IRQ- 2
SDA 2
DDC-SCL 1
DDC-SDA 1
RESET_MASCOT 2
DDC-SCL1 1
DDC-SDA1 1
BLT_ON 2
DC_EN
5
PWM1 2
PWM0 2
VDDCTRL 2
RESET
2
VDDCTRL 2
VDDD
4
EN_18V
VGA-DET 1
VCC
VCC
VCC
VCC
VCC
VCC
12V
12V
5V
VCC
VCC
VCC
VCC
+3.3V
+3.3V
R187
4.7K
J108
5pin/2mm
1
2
3
4
5
1
2
3
4
5
L115 3.5X9X0.8/NC
R169 1K
R168
1K
Q109
MMBT3904
C160
10uF/50V
C167
0.1u/NC
+
C288
470uF/16V
+
C289
470uF 16V/NC
C149
0.1u
C153
0.1u
L114
NC
C157
0.1u
L109 3.5X9X0.8
R188
4.7K
C154
0.1u
C155
0.1u
C156
0.1u
R076
2.2K/NC
C168
0.1u/NC
R189
4.7K
Q110
MMBT3904
R156
150
R155
150
1 6
7
17
18
28
29
39
40
P105
PLCC-44 SOCKET
+
C164
1uF/50V
L113 3.5X9X0.8
+
C282
470uF/16V
C150 22p
X100
12MHZ
J104
MRT DEBUG I/O/NC
1
2
3
4
5
10
9
8
7
6
1
2
3
4
5
10
9
8
7
6
R150 NC
I112 AP1117 3.3V
1
2 3
GND
VOUT VIN
I105
W78E62BP-PLCC
35
21
20
10
14
15
16
17
2
3
4
5
6
7
8
9
43
42
41
40
39
38
37
36
24
25
26
27
28
29
30
31
19
18
32
33
13
11
44
22 23 34 1 12
EA/VP
X1
X2
RESET
INT0 / P3.2
INT1 / P3.3
T0 / P3.4
T1 / P3.5
P1.0 / T2
P1.1 / T2EX
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
AD0 / P0.0
AD1 / P0.1
AD2 / P0.2
AD3 / P0.3
AD4 / P0.4
AD5 / P0.5
AD6 / P0.6
AD7 / P0.7
A8 / P2.0
A9 / P2.1
A10 / P2.2
A11 / P2.3
A12 / P2.4
A13 / P2.5
A14 / P2.6
A15 / P2.7
P3.7/ RD
P3.6 / WR
PSEN
ALE
P3.1 / TXD
P3.0 / RXD
VCC
VSS P4.0 P4.1 INT3 / P4.2 INT2 / P4.3
C152
0.1u
R075 150
R074 150
C151 22p
R191
4.7K
C066
22u 16V/NC
R193 NC I100
24LC16B
1
2
3
4
5
6
7
8
A0
A1
A2
VSS
SDA
SCL
WP
VCC
D113
1N4148
1
2
C212
0.1u
Q101
MMBT3904/NC
Q111
MMBT3904
R171
3.3K
Q102
MMBT3906
1
3
2
R195
2.2K
C166
0.1u
Q113
MMBT3906
1
2 3
C165
0.1u R194
100K
L108
200
R173
1K
R172
4.7K
C209
0.1u
R196
4.7K
R081
150
Q103
MMBT3904
+ C171
NC
R184
NC
R183
0
R190 4.7K
Q100
MMBT3906 1
3
2
R145
4.7K
R146
4.7K
R147
NC
R148
NC
R185
NC
R161
150
R160
150
R154 330
R197
4.7K
Q104
2SA1020
J109
3PIN 2mm/NC
1
2
3
1
2
3
R165
4.7K
J103
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
R198
4.7K
R163 330
R166
4.7K
R159
150
R153 10K
R162 10K
R157
150
R158
150
R082
150
R083
150
10.3. MCU
!
!
ViewSonic Corporation
25
Confidential – Do Not Copy
VE155s , VE500-2
VE 15 5 /b, VA520-2