Service manual

ST AUDIO USE 5.6K
MINUS
PLUS
POWER
MENU
EXIT
DDC_CLK
LED_A
PWM VOLUME
LED_G
MINUS
LED_G
PLUS
DDC_DAT
POWER
MENU
EXIT
LED_A
DDC_CLK ( 3 )
DDC_DAT ( 3 )
INT( 4 )
TCLK( 4 )
VOLUME( 8 )
onBACKLIGHT ( 2 )
SCL-RDZ ( 4 )
SDA-WRZ ( 4 )
CSZ-ALE ( 4 )
HWRESET ( 4 )
AD3 ( 4 )
onPANEL ( 5 )
AUDIO_STANBY ( 8 )
AD0 ( 4 )
AD1 ( 4 )
AD2 ( 4 )
VCC_3v3
VCPU
VCC5V
VCPU
PC5V VCC5V
VCPU
VCPU
VCPU
VCPU
VCC_3v3 VCC_3v3
+
C124
47uF/16V
RP01
10K
1 2 3 4 5
6 7 8
R132
10K
R126
1M
RP03
10K
1 2 3 4 5
6 7 8
D112
SB14
I105
24C16
1
2
3
4 5
6
7
8
A0
A1
A2
GND SDA
SCL
WP
VCC
R135
10K
C127
27pF
D110
1N4002
C129
NC
+
C123
4.7uF/50V
Q103
2N3906
3
1
2
R137
470
R128
10K
+
C139
NC
R136
10K
X101
12MHZ
Q104
2N3906
3
1
2
C130
NC
C133
NC
RP04
100
1
2
3
45
6
7
8
R177
NC
RP02
10K
1 2 3 4 5
6 7 8
C131
NC
C132
NC
RP06
2K7
1 2 3 4 5
6 7 8
I102
CS8954(PDIP40)
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
25
26
27
28
32
33
34
35
36
9
10
11
12
13
14
15 16
37
38
39
40
30
29
31
P5.0/DA0
P5.1/DA1
P5.2/DA2
P5.3/DA3
P5.4/DA4
P5.5/DA5
HSCL2/P5.6
HSDA2/P5.7
P7.7
X2
X1
GND
P6.0/AD0
P6.1/AD1
P6.2/AD2
P6.3/AD3
P6.4
P6.5
P6.6/CLKO
P6.7
P1.7
P1.6
P1.5
P1.4
P1.3
RST
HSCL1/RXD0/P3.0
HSDA1/TXD0/P3.1
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1 P7.6/CLKO
P1.2
P1.1
P1.0
VDD
NC
NC
NC
R176
NC
C134
NC
D108
1N4148
RP07
4K7
1 2 3 4 5
6 7 8
C126
27pF
C128
0.1uF
RP05
100
1
2
3
45
6
7
8
C125
0.1uF
D107
1N4148
R184
NC
R161 4K7
R133
10K
D109
1N4002
R134
470
C135
NC
P103
JST-PH8P-2.0-90
1
2
3
4
5
6
7
8
SELECT
DOWN
UP
MENU
GND
LED_GREEN
LED_AMBER
LCD_ONOFF
R125
2K2
VCC_3v3 ( 2,4 )
PC5V
( 3 )
10.5. MCU
ViewSonic Corporation Confidential - Do Not Copy VA902-3_VA902b-3
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