ViewSonic VA902B Service Manual - Page 7
CIRCUIT THEORY, Block Diagram
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UPC - 766907146318
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3. CIRCUIT THEORY 1. Block Diagram TFT LCD Panel 19" Lamp1 1 Lamp2 2 Transformer1 AOP605L AOP605L OZ9910 Transformer2 Open Protection 4 3 21 On/Off Brightness Power Power Transformer Rectifier & Filter Circuit Block Diagram 12V Rectifier & Filter Circuit 5V Feedback OVP LTV817 Panel Interface 5V 24C16 MCU W78E65p LDO 5V-3.3V 5V-1.8V AP2301 PMBT3906 Panel Enable On/Off XTAL2 14.318MHz Scaler TSU16AK Brightness XTAL1 22.118MHz AC Line Filter TOP246Y OPP/OCP 24C02 3 Lamp3 4 Lamp4 AC Socket AC Input 90V-264V Keypad Connector Keyboard VGA Connector VGA Input ViewSonic Corporation Confidential - Do Not Copy VA902/b 4
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3
.
CIRCUIT THEORY
1. 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 19"
Feedback
OVP
LTV817
Power
Transformer
MCU
W78E65p
Power
Transformer2
Lamp1
Lamp4
AC Input 90V-264V
XTAL2
14.318MHz
24C16
Open
Protection
Rectifier &
Filter Circuit
24C02
Block Diagram
On/Off
Brightness
On/Off
Brightness
12V
5V
AP2301
PMBT3906
Panel Enable
AOP605L
1
2
3
4
1
2
3
4
5V
AOP605L
4
ViewSonic Corporation
Co
nfidential - Do Not Copy
VA902/b