Service manual

ViewSonic Corporation Confidential - Do Not Copy Q9b-2
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