ViewSonic VE155B - 15" LCD Monitor Service Manual page 28

10.3. MCU
C150 22p
X100
12MHZ
C151 22p
2
SDA
2 SDA
SCL
2 SCL
VCC
R155 R156 R157 R158
150 150 150 150
C152
4
VSS
1 6
A0 SCL
2
0.1u
A1
3 5
A2 SDA
7
WP
I100
24LC16B
C153 C154
0.1u 0.1u
VCC
R165 R166
4.7K 4.7K
SCL
1 DDC-SCL
SDA
1 DDC-SDA
TxD
RxD
P105
18
28
40 1 6
PLCC-44 SOCKET
VCC
C149
0.1u
I105
35 43
EA/VP AD0 / P0.0
42
AD1 / P0.1
21 41
X1 AD2 / P0.2
40
AD3 / P0.3
39
AD4 / P0.4
20 38
X2 AD5 / P0.5
37
AD6 / P0.6
36
AD7 / P0.7
RESET 10
RESET
24
A8 / P2.0
25
A9 / P2.1
14 26
IRQ-
INT0 / P3.2 A10 / P2.2
15 27
INT1 / P3.3 A11 / P2.3
16 28
T0 / P3.4 A12 / P2.4
17 29
T1 / P3.5 A13 / P2.5
30
A14 / P2.6
ENTER 2 31
P1.0 / T2 A15 / P2.7
MENU
3
P1.1 / T2EX
UP
4 19
P1.2 P3.7/ RD
5 18
P1.3 P3.6 / WR
6 32
P1.4 PSEN
7 33
P1.5 ALE
8 13
P1.6 P3.1 / TXD
9 11
P1.7 P3.0 / RXD
W78E62BP-PLCC
R159 R160 R161
150 150 150 R081
150 FOR Winbond ISP
Winbond ISP
J103
P 8
8
LED_OR 7
7
LED_GRN 6
6
GND
5
5
M
4
4
U 3
3
D 2
2
E 1
1
C155 C156 C157
0.1u 0.1u 0.1u
VCC
J104
10
10
9
9
8
8
7 R183 0
7
6
6 VCC
5
5
4
4
3
+3.3V
3
2
2
1 R184 NC
1
MRT DEBUG I/O/NC
2.0 mm
R171 3.3K
2 VDDCTRL
ViewSonic Corporation
R197
4.7K
R147 R148
NC NC
R198 R145 R146
4.7K 4.7K 4.7K
R150 NC
MUTE
PWM1
Q101
MMBT3904/NC
VGA-DET 1
C066
RESET_MASCOT 2
DC_EN1
22u 16V/NC
R074 150
DDC-SCL1 1
DDC-SDA1 1
R075 150
VCC
R082 R083
150 150
TxD
RxD
R188
4.7K
Q110
MMBT3904
VCC
Q113
MMBT3906
2 3
RESET
D113
C166 1N4148
0.1u R196 C165
R194 R195 4.7K 0.1u
100K 2.2K
+
C164
1uF/50V
R185
NC
I112 AP1117 3.3V
Q104 L108
2SA1020 200
3 2
VIN VOUT
R172 C209 C212
0.1u 0.1u
4.7K
R173
1K
L114
NC
+3.3V
Q103
MMBT3904
25
Confidential – Do Not Copy
VCC
Q102
MMBT3906
3
1
LED_GREEN
2 R154 330
AMBER
R153 10K
R162 10K 3 Q100
R076 1 MMBT3906
2
2.2K/NC
R163 330
Audio_control_(NC)
12V
R189
4.7K J109 L115 3.5X9X0.8/NC
3PIN 2mm/NC
1
1
2
EN_18V 2
3 PWM1
PWM1 2
3
+
C289
470uF 16V/NC C167
C168 0.1u/NC
0.1u/NC
R191
4.7K
R190 4.7K
DC_EN1
2
R193 NC
2 VDDCTRL
5V
VCC
L109 3.5X9X0.8
12V
+
C282
470uF/16V
L113 3.5X9X0.8
R168
J108 1K
5pin/2mm
1
1
2
R169 1K
2
3 Brightness
3
4
4
5 Q109
BLT_ON 2
5
MMBT3904
+
C288 C160
4
VDDD
470uF/16V 10uF/50V
VE155s, VE500-2
VE155/b, VA520-2
C
B E
LED_GRN
LED_OR
VCC
R187
5
4.7K
DC_EN
Q111 + C171
MMBT3904
NC
PWM0
2