Service manual

55
ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2
10. Schematic Diagrams
Model
Title
Date Rev:
ViewSonic Corporation
DC to DC
2
3
1
MUTE
VOLUME
BRIGHTNESS
GND
AP2305N, 2N7002,
PMBT3906, PMBT3904
pins define
GND
From Keypad
ON/OFF
GND
POWER
ORANGELED_O
ORANGE
MENU
+3.3V
GREEN
ON/OFF
AUTO
GREEN
ON/OFF
LED_G
DOWN
UP
KEY_UP 4
KEY_MENU 4
KEY_DOWN 4
DIMMER 4
LED_ORANGE 4
LED_GREEN 4
KEY_POWER 4
PANEL_ENABLE4
VOL 4
KEY_AUTO 4
CCFL_ENABLE 4
MUTE 4
VCC3.3
VCC3.3 VCC1.8
VCC3.3
VCC3.3
VCC3.3
VLCD
VCC3.3
C110 0.1/50V
+
C104
100u/16V
R112 220
CN101
2x4P 2.0mm
1
2
3
4
5
6
7
8
Q101
2N7002
1
32
C106
0.1/50V
1
3 2
Q104
PMBT3906
C117
0.1/50V
R101 4K7
R102 4K7
C112 0.1/50V C113 0.1/50V
R111 100
C111 0.1/50V
1
3
2
Q106
PMBT3906
1
3 2
Q103
PMBT3906
C107
1u/16V/NC
+
C116
100u/16V
R103 10K
C115
1u/16V
R105 1K
C101 0.01/50V
C103
0.1/50V
R114
4K7
R109 4K7
C109 0.1/50V
R115 4K7
Q105
AP2305GN
1
32
R107 1K
C105
0.1/50V
R104 4K7
R152
33
R108 1K
CN102
8P 2.0mm
1
2
3
4
5
6
7
8
R110 1K
R113
20K
FB101
600Ω 2A
Q102
PMBT3904
1
32
R106 1K
C114 0.01/50V
U101
LD1117AL-1.8V
3
1
2
VIN
ADJ
VOUT
+
C102
100u/16V
VLCD 4
VCC3.3 3,4 VCC1.8 4