Service manual
57
ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2
Model
Title
Date Rev:
ViewSonic Corporation
SCALER
WP
RXE1+
RXE0-
RXE2-
MDA
RXEC+
MCL
RXE3-
RXEC-
RXE0+
RXE3+
PANEL_ENABLE
RXE1-
RXE2+
GNDB3
GNDG3
VSYNC3
GNDR3
GIN3
DDCA_SCL3
DDCA_SDA3
DET_VGA3
RIN3
SOG3
BIN3
HSYNC3
LED_ORANGE 2
KEY_AUTO 2
KEY_MENU 2
MUTE 2
KEY_DOWN 2
VOL 2
DIMMER 2
KEY_POWER 2
KEY_UP 2
PANEL_ENABLE 2
WP
3
CCFL_ENABLE 2
LED_GREEN 2
VDDCVMPLL VPLLVADC
VPLLVMPLL
VDDP
VDDC
VADC
VADC
VCC3.3
VCC3.3
VCC3.3
VCC3.3
VLCD
VCC3.3
VCC3.3
VCC3.3
VCC3.3
VCC1.8
VDDP
VCC3.3
TSUM16AL
23
20
21
18
22
19
17
27
28
15
26
25
37
39
38
40
47
86
59
96
97
60
61
62
63
64
65
67
68
69
70
71
72
73
74
77
78
58
55
54
2
5
3
4
6
7
8
9
10
12
13
11
29
33
24
56
53
52
81
51
30
31
100
1
93
14
75
35
48
85
88
89
90
91
92
94
95
99
43
44
84
41
42
98
16
32
49
66
82
34
50
57
76
79
83
80
87
36
45
46
RIN0P
GIN0P
SOGIN0
BIN0P
RIN0N
GIN0N
BIN0N
HSYNC0
VSYNC0
REXT
REFP
REFM
SDO
SCK
SCZ
SDI
PWM2/GPIO_P24
PWM1/GPIO_P25
LVACKM
XIN
XOUT
LVA2P
LVA2M
LVA1P
LVA1M
LVA0P
LVA0M
LVB3P
LVB3M
LVBCKP
LVBCKM
LVB2P
LVB2M
LVB1P
LVB1M
LVB0P
LVB0M
LVACKP
LVA3M
LVA3P
GND
GND
NC
NC
NC
NC
AVDD_ADC
NC
NC
NC
NC
GND
GND
GND
AVDD_ADC
VDDP
MODE[1]
MODE[0]
VCTRL
VDDC
DDCA_SDA/RS232_TX
DDCA_SCL/rs232_RX
DDCD_SDA
DDCD_SCL
PWM0/GPIO_P26
AVDD_ADC
VDDP
GPIO_P15/PWM0
GPIO_P27/PWM1
GPIO_P12
GPIO_P00/SAR1
GPIO_P01/SAR2
GPIO_P02/SAR3
GPIO_P06
GPIO_P07
GPIO_P13
GPIO_P14
GPIO_P16/PWM2
GPIO_P11/I2C_MDA
GPIO_P10/I2C_MCL
RST
GPIO_P23
GPIO_P22
AVDD_MPLL
AVDD_PLL
VDDP
VDDP
VDDC
VDDC
VDDC
GND
GND
GND
GND
GND
BYPASS
RSTN
NC
NC
NC
C132
0.1/50V
C148 0.1/50V
C140 0.1/50V
FB103
600Ω
RP101
4K7x4
81
72
63
54
R143
0
RP102
4K7x4
81
72
63
54
C147
0.1/50V
C144
0.1/50V
C130 0.1/50V
C135 0.1/50V
C131 0.1/50V
+
C136
22u/16V
X101
14.318MHz
C134
0.1/50V
C139 0.1/50V
U105
AT24C04N
1
2
3
45
6
7
8
A0
A1
A2
GNDSDA
SCL
WP
VCC
R141 100
CN104
HS8920E
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
R151
4K7/NC
R146 4K7
U104
SST25VF010A
1
2
3
4 5
6
7
8
CS#
SO
WP#
GND SI
SCK
HOLD#
VCC
R142 100
R144 4K7
R154
4K7
Q107
PMBT3904
1
32
+
C142 22u/16V
R150 100
R140 390 1%
R155 220
FB104
600Ω
R137 10K
R153
0/NC
FB106
600Ω
FB105
600Ω
C151 18p/50V
R156
8K2
+
C152
10u/25V
C145
0.1/50V
RP103
4K7x4
81
72
63
54
C150 18p/50V
C141
0.1/50V
R139 4K7
+
C133
22u/16V
R136 10K
C137 0.1/50V
C128 1u/16V
R149 100
C138 0.1/50V
+
C129
22u/16V
R147 4K7
C149 0.1/50V
C146 0.1/50V
VCC3.32,3
VCC1.82