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ViewSonic
Service Manual
April 1999 - Version 1.0
VG150
THEORY OF CIRCUIT OPERATION
Symbol
640
| 640 | 720 | 640 | 800 | 1024 | Description
x
x
x
x
x
x
350
| 400
| 400 | 480
| 600 | 768
HBP
11.
| OCH]
2CH | 4CH | 6CH | 8CH } ACH
|LCD
HSYNC
back
porch
ODH | 2DH | 4DH | 6DH | 8DH | AD _| (including HPW)
HSIZE
11. | OEH | 2EH | 4EH | 6EH | 8EH | AEH | LCD number of columns
OFH | 2FH | 4FH | 6FH | 8FH | AFH
HTOTAL
11
10H
| 30H |} 50H | 70H | 90H | BOH | LCD total number of pixels per|
41H | 31H | 54H | 71H | 94H | BIH
| line including all porches
HTOTAL
12
12H | 32H | 52H | 72H | 92H | B2H | LCD total number of clocks
Source
13H | 33H | 53H | 73H | 93H | B3H | per line (source equivalent)
=HTOTAL/Line Expansion
Line
4
14H | 34H | 54H | 74H | 94H | B4H | Vertical source
to destination
Expansion
" |
[6:3] | [6:3] | [6:3] | [6:3] | [6:3] | [6:3]
scaling factor
0: 1 to 1
1:2 to 3
2:3 to 4
3:5 to 8
4: 15 to 32
5: 25 to 32
6: 25 to 48
7: 25 to 64
8: 75 to 128
9: 175 to 384
10: 175 to 512
3
14H | 34H | 54H | 74H | 94H | B4H | Horizontal source to
[2:0] } [2:0] | [2:0} | [2:0] | [2:0] | [2:0] | [2:0] | destination scaling factor
0: 1 to 1
1:2 to 4
2:4to5
3: 25 to 36
4.5108
5: 9 to 10
6: 45 to 64
7: 9 to 16
Fog Factor
15H | 35H | 55H | 75H | 95H | BSH | Horizontal fogging factor
Horizontal
Fog Factor
16H | 36H | 56H | 76H
B6H | Double
of Horizontal
fogging
2X
factor
Pixel
Expansion
Page 19
(Contidential
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