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Service Manual
ViewSonic
VG150
April 1999 - Version 1.0
THEORY OF CIRCUIT OPERATION
Symbol
640 | 640 | 720 | 640 | 800 | 1024 | Description
x
x
x
x
x
x
350 | 400 | 400 | 480 | 600 | 768
Fog Factor
17H | 37H | 57H | 77H | 97H | B7H | Vertical fogging factor
|
Vertical
He
seh Ea
ee
si
Source
3
1CH | 3CH | 5CH | 7CH | 9CH | BCH
HSIZE[11:8]
Source
[6:4] | [6:4] | [6:4] | [6:4] | [6:4] | [6:4]
3 | 1CH|
3CH | 5CH | 7CH | 9CH | BCH
Source
vertical
size
upper
3
bits
HSIZE[1 14:8]
Source
[2:0} | [2:0] | [2:0] | [2:0} | [2:0] | [2:0}
1DH | 3DH | 5DH | 7DH | 9DH | BDH
Source horizontal size lower 8
bits
HSIZE[7:0]
Input Mode Detection Data
Symbol
| With (bits)
lf the data is smaller than this threshold, it is
Data high threshold
121H
considered LOW internal
High water mark for valid data
lf data
is larger than
this threshold,
it is
considered HIGH internall
Minimum difference between the data value of
two adjacent pixels to be considered as an
edge
Edge threshoid
Page 20
(Contidential Do Not Copy
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