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11
.
Block Diagram
ViewSonic Corporation
53
Confidential – Do Not Copy
A
9
0f+-1
Video
Pre-Amp
I901
Video
Output
Stage
Rotation
Deflect
ion co
il
H.V
R
Sync.
Buffer
On Screen
Display I903
DC
Restorer x3
DP
M
S
I
Key control
H
V
OF
F
Power save
control
CS
CONTROL
F/
V
E
2
PROM
Rotation
Amp.
Horiz.
Driver
Blanking
&
Spot killer
Time-base
Controller
Vertical
Output Amp
Horiz.
Output
Stage
GND
G
GND
B
GND
GND
H
V
SDA
SCL
DOWN
UP
H.Deflection
B
+
control
o/p stage
LED
CKT.
High Voltage
control
High Voltage
Driver
FBT
Heater
Control
B
+
Control
Driver
X-ray
Protect
Dynamic
Focus CKT.
Degauss
Degauss
Control
EMI
Filter
PWM
Controller
Frequency
reduction
Protection
OVP
UVP
ON/OFF
Control
5V regulator
AC DC
Rectifier
Switching
Transistor
Feedback
Control
12V
Control
12V
Regulator
Green LED
Amber LED
ACV Input
100/240VAC
H
V
Grid 2
Grid 1
+193V
+82V
+15V
+9V
-15V
To Time base & Video CKT
+5V
H. V=26.KV
R,G,B Buffer x3
A90f+ (F19FSVZ)
BLOCK DIAGRAM
SDA1
SCL1
MCU IA01
I904
CDT
I310
I301
12V
Regulator
M52743BSP
LM2435
UM68P62
TDA9116
TDA8172
PFC
CKT
M46QCK761X123 (TCO MDT)
1
2
Autosizing
UltraBrite
Summary of Contents for A90f+ 1
Page 57: ...12 PCB Layout ViewSonic Corporation 54 Confidential Do Not Copy A90f 1...
Page 58: ...VIDEO PWB 0414 ViewSonic Corporation 55 Confidential Do Not Copy A90f 1...
Page 59: ...KEY CONTROL PWB 0488 ViewSonic Corporation 56 Confidential Do Not Copy A90f 1...
Page 60: ...MAIN BOARD 13 Schematic Diagrams ViewSonic Corporation 57 Confidential Do Not Copy A90f 1...
Page 61: ...VIDEO ViewSonic Corporation 58 Confidential Do Not Copy A90f 1...
Page 62: ...KEY CORTROL ViewSonic Corporation 59 Confidential Do Not Copy A90f 1...
Page 63: ...POWER SUPPLY CKT ViewSonic Corporation 60 Confidential Do Not Copy A90f 1...
Page 64: ...MCU CONTROL CKT ViewSonic Corporation 61 Confidential Do Not Copy A90f 1...
Page 65: ...Time Base DeflectionCKT ViewSonic Corporation 62 Confidential Do Not Copy A90f 1...
Page 66: ...H V DYNAMIC FOCUS CKT ViewSonic Corporation 63 Confidential Do Not Copy A90f 1...
Page 67: ...14 Exploded Diagram ViewSonic Corporation 64 Confidential Do Not Copy A90f 1...