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ViewSonic Corporation
Confidential - Do Not Copy
VA702-2_VA721-3_VA721b-3
50
9. Block Diagram
XTAL1
22.118MHz
TOP246Y
OPP/OCP
LDO
5V-3.3V
5V-1.8V
Transformer1
OZ9910
Rectifier &
Filter Circuit
Panel Interface
Lamp2
Keyboard
Lamp3
Keypad
Connector
VGA Input
VGA Connector
Scaler
TSU16AK
AC Line Filter
AC Socket
TFT LCD Panel 17"
MT170EN01(Innolux)
Feedback
OVP
LTV817
Power
Transformer
MCU
W78E65p
P
o
w
e
r
Transformer2
Lamp1
Lamp4
AC Input 90V-264V
XTAL2
14.318MHz
24C16
Open
Protection
Rectifier &
Filter Circuit
24C02
Block Diagram
On/Off
Brightness
O
n
/O
ff
B
ri
gh
tn
e
ss
12V
5V
AP2301
PMBT3906
Panel Enable
AOP605L
1
2
3
4
1
2
3
4
5V
AOP605L