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,...

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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...

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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...

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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...

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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....

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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...

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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...

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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...

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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...