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ViewSonic Corporation
Confidential - Do Not Copy
VA702-1_VA702b-1
4
8
9. Block Diagram
XTAL1
22.118MHz
TO
P246Y
OPP/
OCP
LDO
5V-3.3V
5V-1.8V
Transformer1
OZ9910
R
ect
ifier
&
Fi
lter Circuit
P
anel
Interface
Lamp2
Keyboard
Lamp3
Keypad
Connector
VGA
Input
VG
A C
onnec
tor
Scaler
TSU16AK
AC Line Filter
AC Socket
TFT LCD Panel 17"
MT170EN
01(Innolux)
Feedback
OVP
LTV817
Power
Transformer
MC
U
W78E65p
Power
Transformer2
Lam
p1
Lamp4
A
C
Input
90V-264V
XTAL2
14.318M
Hz
24C16
Op
en
Pro
tecti
on
R
ect
ifie
r &
Fil
ter C
ircui
t
24C02
Block Diagr
am
On/
Off
B
rig
htness
On/Off
Brightness
12V
5V
A
P
2301
PM
BT3906
Panel Enable
AOP
605L
1
2
3
4
1
2
3
4
5V
AOP605L