Service manual

Model
Title
Date Rev:
ViewSonic Corporation
MCU(I/O_Key)
66
For Debug Use
5V-DETECT
SCL
SDA
SCL
SDA
MUTE
BL-PWM
BL-PWM
VOL-PWM
VOL-PWM
5V-DETECT
SDA
SCLTX
RX
DOWN
RIGHT
LEFT
PWR
UP
MENU
SEL
STANDBY
LEDA1
LEDG1
UP-
MENU- MENU
DOWN-
PWR-
RIGHT-
SEL-
LEFTLEFT-
DOWN
RIGHT
SEL
PWR
UP
PWR-
LEFT-
DOWN- SEL- MENU-
RIGHT- UP-
WP
MUTE- MUTE_KEY
MUTE_KEY
LEDG1
LEDA1
WP
PANEL_SEL1 PANEL_SEL2
PANEL_SEL2
PANEL_SEL1
PANEL_SEL3
PANEL_SEL3
MUTE-
LEDG
LEDA
LEDG
LEDA
IRQn3
BL-ON6
BL-BRIGHT 6
SDA 3
SCL 3
REFCLKI3
BYPASS-VS3
MUTE 7
STANDBY 7
VOLUME 7
BYPASS-HS 3
LCD-ON 5
RSTn 3
DVI-DET 2
VGA-SCL 1
DVI-SDA 2
DVI-SCL 2
VGA-SDA 1
VGA-DET 1
Rx1
Tx1
MCU-VDD
+5V
MCU-VDD
MCU-VDD
+5V
+5V
+5V
+5V
+5V
GND_A
GND_A GND_A
GND_A
GND_A
GND_A
GND_A GND_A
GND_A
GND_A
GND_A
GND_A
GND_A
MCU-VDD
MCU-VDD
MCU-VDD
GND_AGND_A
MCU-VDDMCU-VDD
GND_A GND_AGND_A GND_A
MCU-VDDMCU-VDDMCU-VDD
GND_A
MCU-VDDMCU-VDD
MCU-VDD
GND_A
GND_A
MCU-VDD
GND_A
MCU-VDD
GND_A
MCU-VDD
GND_A
MCU-VDD
+
C36 47uF/16V
R49
1K/6
R66 330/6
R51 4.7K/6
R31 4.7K/6
R34 100K/6
68F633L
IC3
68F633-PLCC44
41
42
43
10
44
12
22
20
21
11
13
16
17
15
14
24
23
9
8
7
6
5
4
3
28
27
26
25
2
29
30
31
34
35
1
36
37
18
19
38
39
40
32
33
PC2/SOGI
PC1*
PC0*
RSTB
VDD
PD6
GND
OSCO
OSCI
P30/RXD
P31/TXD
P34/T0
P35/T1
PB3/ADC3/INTE1
PB2/ADC2/INTE0
PB1/ADC1
PB0/ADC0
PA7*/PWM9*
PA6*/PWM8*
PA5*/PWM7*
PA4*/PWM6*
PA3/PWM5 PA2/PWM4
PA1/PWM3
PB7*/SDA1*
PB6*/SCL1*
PB5*/SDA0*
PB4*/SCL0*
PA0/PWM2
PD5
PD4
PD3
PD2
PD1
PD0
PC7
PC6
PE0
PE1
PC5
PC4
PC3
NC1
NC2
R112 1K/6
R47
2K/6
R117
10K/6
R53
4.7K/6
R43 100/6
R52
4.7K/6
R55 1K/6
D32
CHN217
1
3
2
R64 1K/6
C41 22pF/6
R32 4.7K/6
R42 100/6
R41 100/6
R40 100/6
R50 4.7K/6
R115
10K/6
R118
10K/6/NC
D29
CHN217
1
3
2
R48 2K/6
R114
10K/6/NC
C38
0.1uF/6
R39
15K/6
R58 4.7K/6
D27
CHN217
1
3
2
C35
0.1uF/6
R56 4.7K/6
R62 1K/6
R45 0/6
C42
0.1uF/6
R111
10K/6/NC
R113
10K/6
R60 1K/6
R116
10K/6/NC
D31
CHN217
1
3
2
R37 1M/6
JP1
CON4/NC
1
2
3
4
CN3
CON11P-2.0S
1
2
3
4
5
6
7
8
9
10
11
C37 0.1uF/6
R59 1K/6
R109
10K/6
R54
1K/6
Q1
MMST3906
3
1
2
D34
CHN217
1
3
2
R63 4.7K/6
R65 330/6
R110 22/6
Q2
MMST3906
3
1
2
C39
22pF/6
JP2
CON4/NC
1
2
3
4
D28
CHN217
1
3
2
Y1 12MHZ
D33
CHN217
1
3
2
C43
0.1uF/6/NC
C40
22pF/6
R61 1K/6
D30
CHN217
1
3
2
IC4
AT24C16
1
2
3
4
8
7
5
6
A0
A1
A2
GND
VCC
WP
SDA
SCL
R36
10K/6
R57 1K/6
ViewSonic Corporation Confidential - Do Not Copy VA2012w-1_VA2012wb-1