Service manual

ViewSonic Corporation Confidential - Do Not Copy Q7b-3
7
2-5 ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 30 – 80 kHz
Vertical Refresh Rate 55 – 75 Hz.
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity.
Timing Table
Analog Item Timing
Separated
Composite
SOG
Digital - TMDS
Remark
1
640 x 350 @ 70 Hz, 31.5 KHz

The vertical image size might not full
screen
(vertical position = center).
2
640 x 480 @ 60 Hz, 31.5 KHz
3
640 x 480 @ 67 Hz, 35 KHz
4
640 x 480 @ 72 Hz, 37.9 KHz
5
640 x 480 @ 75 Hz, 37.5 KHz
6
720 x 400 @ 70 Hz, 31.5 KHz
7
800 x 600 @ 56 Hz, 35.1 KHz
8
800 x 600 @ 60 Hz, 37.9 KHz
9
800 x 600 @ 72 Hz, 48.1 KHz
10
800 x 600 @ 75 Hz, 46.9 KHz
11
832 x 624 @ 75 Hz, 49.7 KHz
12
1024 x 768 @ 60 Hz, 48.4 KHz
13
1024 x 768 @ 70 Hz, 56.5 KHz
14
1024 x 768 @ 75 Hz, 60.2 KHz
15
1152 x 864 @ 75 Hz, 67.5 KHz
16
1152 x 870 @ 75 Hz, 68.7 KHz
17
1280 x 960 @ 60 Hz, 59.7 KHz
18
1280 x 1024 @ 60 Hz, 64 KHz
19
1280 x 1024 @ 75 Hz, 80 KHz
Primary Presets
1280x1024 @ 75Hz
User Presets
Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration
Changing Modes
● Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto
Adjust” time
● The monitor needs to do “Auto Adjust” the first time a new mode is detected
(see section “0-Touch™ Function Actions”)
● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank