ViewSonic Va1912w4 Service Manual

							
ViewSonic Corporation
Main Menu Controls Auto Image Adjust *1  
Contrast/Brightness *2*4 
Audio Adjust 
Vo l u m e *4, Mute*4 
Color Adjust    sRGB, 9300K, 6500K(default), 5400, 5000, User Color [R, G, B] 

 
    Information   

 
       H Frequency, V Frequency, Resolution, Pixel Clock, Serial Number,   Model Number, “www.ViewSonic.com
” 
Manual Image Adjust   
    H. Size*
1, H./V. Position*1, Fine Tune*1, Sharpness*3 
    Setup Menu     Language [English, French, German, Spanish, Italian, Fi nnish, Japanese, Traditional Chinese, Simplified Chinese], 
Resolution Notice, OSD Position, OSD Timeout, OSD Background 
Memory Recall 

 
*
1 These functions are not available in Digital Mode 
*2  These functions are not available under sRGB Mode 
*3  These functions are not available under Native Resolution Mode 
*4  These functions setting can be  recalled to default by [▼]+[ ▲] 
 
[Remark] Please refer to the detail in the Appendix C 
 
Function descriptions 
 
OSD Lock short cuts function for the buttons  
The OSD lock will be activated by pressing the front panel control buttons (1), & ( ▲) for 10 seconds. If the user then tries to 
access the OSD by pressing any of the buttons 1,  ▼,  ▲, 2 a message will appear on the screen for 3 seconds showing 
OSD Locked. The OS D lock will be deactivated by pressing the front pa nel control buttons (1), & (▲) again for 10 
seconds. 
Note1: When the OSD is locked will lock all functions, including “Volume” and “Mute” 
Note 2:    Status bar indicating OSD Lock or Unlock is  in progress and when complete it will indicate “OSD Locked” 
Note 3:    OSD Lock should not lock Power Button and Power Lock function  
Power Lock short cuts function for the buttons 
The power button lock will be activated by pressing the front panel control buttons (1), & ( ▼) for 10 seconds. Locking the 
power button means that the user wont be able to turn off th e LCD while the power button is locked. If the user presses the 
power button while it is locked, a message will appear on the sc reen for 3 seconds showing Power Button Locked. It also 
means that with the power button locked, the LCD would automati cally turn back On when power is restored after a power 
failure. If the power button is not in the locked mode, then powe r should return to its previous state when power is restored 
after a power failure. The power button lo ck will be deactivated by pressing the front panel control buttons (1), & (▼) again 
for 10 seconds. 
 
Note 1:    Status bar indicating Power Button lock or unlock is  in progress and when complete it will indicate “Power Button 
Locked” 
Note 2: Power should only be  lockable in the “On State” 
Memory Recall Actions 
Memory Recall action on the analog and digital mode as below 
1. Set the factory defaults as shown in Section 4-8 
2. Clean all the mode setting buffer 
3. Execute Auto Image Adjust 
 
Note: Memory Recall should have no effect for Langua ge, Power Lock, User Color Settings or Input Priority 
Resolution Notice Actions 
1.  Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec 
2.   The OSD should disappear after 10 sec or by pushing button [1] or [2] 
Resolution Notice function should be disabled when push button [2] under Resolution Notice OSD  
0-Touch™ Function Actions 
1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for further use 
2. It should be reset by Memory Recall function 
(Should not reset by power off, power unplug and others) 
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OSD Auto Save 
The OSD shall save new settings when it is turned off by the user or when it times out.    There shall not be a separate save  
 
2.7 AUDIO INTERFACE (SPEAKER SPECIFICATION) 
 Line input connection 3.5 mm stereo jack 
Line input signal 
1 Vrms 
Line input impedance  20k ohms 
Maximum power output (Electric)  1.5W / CH
 
Signal to Noise Ratio  72 dB 
Frequency response  300 TO 20KHZ 
Distortion  8%@1kHz 
Vibration  There should be no audible vibration with volume at 100%. (Input 
signal within 1 Vrms) 
Screen image 
There should be no affect on the screen image stability under any 
conditions 
Connector PC99 requirement Audio in 
Lime Green pantone # 577C 
Cable type / length  3.5mm stereo cable / 1.8m length 
Audio DPMS NOTE: THERE IS NO GUARANTEE 
						

							
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3. Front Panel Function Control Description 
Adjusting the Screen Image 
Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD 
controls are explained at the top of the next page and are defined in “Main Menu Controls” on page 10. 
 
 
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Do the following to adjust the display setting: 
 
1.  To display the Main Menu, press button [1]. 
 
 
NOTE:  All OSD menus and adjustment screens disa ppear automatically after about 15 seconds. This is adjustable through the 
OSD timeout setting in the setup menu. 
 
2.  To select a control you want to adjust, press        or      to scroll up or down the Main Menu. 
3.  After the control is selected, press button [2]. A  control screen like the one shown below appears. 
 
The command line at the bottom of the control screen tells what to 
do next from this screen. You can toggle between control screens, 
adjust the selected option, or exit the screen. 
 
 
 
 
 
4.  To adjust the setting, press the up    or down    buttons. 
5. To save the adjustments and  exit the menu, press button [1]  twice. 
 
 
The following tips may help  you optimize your display: 
• Adjust the computers graphics card so that it outputs a 1440 x 900 @ 60Hz video signal to the LCD display. (Look for 
instructions on “changing the refresh rat e” in the graphics cards user guide.) 
• If necessary, make small adjustments usi ng H. POSITION and V. POSITION until the  screen image is completely visible. 
(The black border around the edge of  the screen should barely touch the illu minated “active area” of the LCD display.) 
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Main Menu Controls 
Adjust the menu items shown below by using the up        and down        buttons. 
Control Explanation Auto Image Adjust  sizes and centers the scr een image automatically.  
Contrast adjusts the difference between the image backgrou nd (black level) and the foreground (white 
level).  
Brightness  adjusts background black level of the screen image. 
Audio Adjust  
Volume  increases the volume, decreases the volume, and mutes the audio. 
Mute  temporarily silences audio output. 
Color Adjust  provides several color adjustment modes, including preset color 
temperatures and a User Color mode which allows independent adjustment of 
red (R), green (G), and blue (B). The factory setting for this product is 6500K 
(6500 Kelvin). 
 
 
  9300K-Adds blue to the screen image for  cooler white (used in most office 
settings with fluorescent lighting). 
6500K- Adds red to the screen image for warmer white and richer red. 
5400K- Adds green to the screen image for a darker color. 
5000K- Adds blue and green to the screen image for a darker color.  
  User Color Individual adjustments for red (R ), green (G), and blue (B). 
1.  To select color (R, G or B) press button [2]. 
2.  To adjust selected color, press        and    . . 
Important:  If you select RECALL from the Main Menu wh en the product is set to a Preset Timing 
Mode, colors return to the 6500K factory pr
eset. 
 
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Control Explanation 
 Information 
displays the timing mode (video signal input) coming from the graphics card in the 
computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your 
graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).
NOTE:  VESA 1440 x 900 @ 60Hz (recommended) means that the resolution is 1440 x 900 and the 
refresh rate is 60 Hertz. 
 
 
  Manual Image Adjust Sub-menu 
 
H. Size (Horizontal Size)  adjusts the width of the screen image. 
 H./V. Position (Horizon
tal/Vertical Position) moves the screen image left or right and up or down. 
 
 
 
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Control Explanation 
Fine Tune  sharpens the focus by aligning text and/or graphics with pixel boundaries. 
NOTE:  Try Auto Image Adjust first. 
 
Sharpness  adjusts the clarity and focu s of the screen image. 
 
 
  Setup Menu 
displays the menu shown below:  
 
Language Select  allows the user to choose the language used in the menus and control screens. 
 
  Resolution Notice 
allows the user to enable or disable this notice. 
 
  If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1440  x 900, the following screen appears. 
 
 
 
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Control Explanation 
OSD Position  allows the user to move the OSD menus and control screens. 
 OSD Timeout 
sets the length of time the OSD screen is di splayed. For example, with a “30 second” 
setting, if a control is not pushed within  30 seconds, the display screen disappears. 
OSD Background  allows the user to turn the OSD background On or Off. 
 Memory Recall 
returns the adjustments back to factory settings if the display is operating in a factory 
Preset Timing Mode listed in the Specifications of this manual. 
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4. Circuit Description 
 
 
 
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The TSUM17AK is total solution graphics processing IC for LCD mon itors with panel resolutions up to SXGA. It is configured with 
a high-speed integrated triple-ADC/PLL,, a high quality display  processing engine, and an integrated output display interface that can 
support RSDS panel interface format. To further reduce system co sts, the TSUM17AK also integrates intelligent power management 
control capability for green-mode requirements an d spread- spectrum support for EMI management. 
The TSUM17AK incorporates the wo rld’s first coherent oversampled RGB graphics ADC in a monitor controller system. The 
oversampling ADC samples the input RGB signals at a frequency that is much higher than the signal source pixel rate. This can 
preserve details in the video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in non-o versampled 
systems. The TSUM17AK also incorporates  a new Dynamic Frame Rate (DFR) generator
 for the digital output video to the display 
panel that preserves the advantages of a fixed output clock rate, while eliminating the output end of frame short-line.  
						

							
ViewSonic Corporation
5. Adjustment Procedure 
A. Function Test and Alignment Procedure 1. All Modes Reset 
You should do “All Model Reset” (Refer to Chap 3. Hot Ke ys for Function Controls) first. This action will allow 
you to erase all end-user’s settings and restore the factory defaults. 
  2. Auto  Image Adjust   The Auto Adjust is aimed to offer a  best screen quality by built-in ASIC.  For optimum screen quality, the user 
has to adjust each function manually.  A.Turn the computer and LCD monitor on. 
B. Press the ‘ Auto’ button on monitor keypad to Auto Adjust. 
C. The LCD monitor will start the Auto Adjust process  automatically and run for 10 consecutive seconds, during 
which time you will notice the image change. 
3. Firmware  Test Patten: Burn in Model (Refer to Chap3. Hot Keys for Function Control) 
-Make sure the F/W is the latest version. 
 
4. DCC Test Patten: EDID program 
-Make sure it can pass test program. 
  5. Window Shut Down Test Signal: 1280*1024@60Hz
 
Test Pattern:   
 
Checkered Pattern Every One Pixel (50%Green & 50%Blue) 
Inspection Item: Flicker, Mura 
  6. Window BG Test Signal: 1280*1024@60Hz
 
Test Pattern:   
 
Window standard pattern 
Inspection Item: Line Defect, Function Defect & Mura 
7. 25 Gray 
Test Signal: 1280*1024@60Hz
 
Test Pattern:   
 
Full Screen 25% White (Gray) 
Inspection Item: Particle, Line Defect & Mura 
  8. 50 Gray Test Signal: 1280*1024@60Hz
 
Test Pattern:   
 
Full Screen 50% White (Gray) 
Inspection Item: Bright Dot, Pa rticle, Line Defect & Mura 
  9. White Box Test Signal: 1280*1024@60Hz
 
Test Pattern:   
 
Window standard pattern 
Inspection Item: Particle, Line Defect, Power, Image Remain & Mura 
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