ViewSonic Vg930m3 Service Manual

							
ViewSonic Corporation Confidential - Do Not Copy    VG930m-3_VA930m-1 
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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.
Main Menu
with OSD controls
Front Control Panel
shown below in detail
Scrolls through menu options and adjusts the displayed control.
Also a shortcut to display the Co ntrast adjustment control screen.
Power light
Blue = ON
Orange = Power Saving Standby Power On/Off
Displays the Main Menu or exits the control screen and saves 
adjustments. Audio Mute button turns the sound off
Displays the control screen for the highlighted control.
Also toggles between two controls on some screens. 
						

							
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Do the following to ad
just the display setting:
1. To display the Main Menu, press button [1].
NOTE:  All OSD menus and adjustment screens  disappear automatically after about 15 
seconds. This is adjustable through the  OSD timeout setting in the setup menu.
2. To select a control to adjust, press SorT to scroll up or down in the Main Menu.
3. After the desired control is se lected, press button [2]. A cont rol screen like the one shown 
below appears.
4. To adjust the setting, press the up S  or down T 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 1280 x 1024 @ 60Hz video signal to 
the LCD display. (Look fo r instructions on “changing the refresh rate”  in the graphics cards 
user guide.)
• If necessary, make small adjustments using  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 illuminated “act ive area” of the LCD display.)
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. 
						

							
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Main Menu Controls
Adjust the menu items shown below by using the up  S and down  T buttons.
Control Explanation
Auto Image Adjust  sizes and centers the screen image automatically.
Contrast  adjusts the difference between the image background  (black level) 
and the foreground (white level).
Brightness  adjusts background black level of the screen image.
Input Select  toggles between inputs if you ha ve more than one computer 
connected to the VG930m.
Audio Adjust
Vo l u m e  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 wh ich allows independent adjustment of 
red (R), green (G), and blue (B). The  factory setting for this product is 6500K 
(6500 Kelvin).
sRGB- This is quickly becoming the industr y standard for color management, 
with support being included in many of th e latest applications. Enabling this 
setting allows the LCD display to more  accurately display colors the way they 
were originally intended. Enabling the sRGB  setting will cause the Contrast and 
Brightness adjustment s to be disabled.
9300K- Adds blue to the screen image for cooler white (used in most office 
settings with fluorescent lighting).
7500K- 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. 
						

							
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Control Explanation
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 Sand T.
Important: If you select RECALL from the Main Menu when the product is 
set to a Preset Timing Mode, colors  return to the 6500K factory preset.
Information  displays the timing mode (vid eo signal input) coming from the 
graphics card in the computer, the LC D 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 1280 x 1024 @ 60Hz (recommended) means that the resolution 
is 1280 x 1024 and the refresh rate is 60 Hertz.
Manual Image Adjust
H. Size (Horizontal Size)  adjusts the width of the screen image.
H./V. Position (Horizontal/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 te xt and/or graphics with pixel 
boundaries.
NOTE:  Try Auto Image Adjust first.
Sharpness  adjusts the clarity and focus of the screen image.
Setup Menu  displays the menu shown below:
Language  Select allows the user to choose th e 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 show n above and your computer is set at a 
resolution other than 1280 x 1024,  the following screen appears.
OSD Position  allows the user to move the OSD menus and control screens.
OSD Timeout  sets the length of time the OSD  screen is displayed. For example, 
with a “30 second” setting,  if a control is not pushed within 30 seconds, the 
display screen disappears. 
						

							
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Control Explanation
OSD Background allows the user to turn the OSD background On or Off.
Memory Recall  returns the adjustments back to fa ctory 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 
 4.2 Power Board   
Electric Spec : 
Connection  9Pin NO.  6Pin NO.  Symbol  Description 
 9 NC  DC-Output  24.0±10%Vdc / 50mA (Optional) 
  8 NC  DC-Output  12±10%Vdc / 200mA (Optional) 
  7 6  BL-Adj  Luminance Control ( 0Vdc~3.3Vdc ) 
CON802  6 5  ON/OFF  ON : 3.3Vdc or 5.0Vdc ; OFF : 0V 
  4. 5  3. 4  DC-Output  5.0±5%Vdc / 2500mA 
 2. 3  1. 2  GND  GND 
 1 NC DC-Output -8±10%Vdc  / 100mA(Optional) 
1 1 H.V  High  Voltage CON901~CON904 
2 2 Return  Return  Pin 
 
 
  
						

							
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ELECTRIC TEST   
1. POWER TEST :   
1-1 . OUTPUT VOLTAGE TEST : Output  24V connect 50mA, CON801 Input  
1-2 . HI-POT TEST :  1)  Test Requirements – Input Voltage : 3.0KVdc 
– Measurement Time : 3sec   
– Temperature : 25 ± 5   ℃℃ 
2)   A method of measurement : Injection voltage between  Utility (Line and Neutral short) and output line (short 
between + and - )   
3)   Criterion for Judging : PASS 
1-3 . SHORT TEST PROTECT :  24Vdc SHORT to GND , POWER PROTECT .   
12Vdc SHORT to GND , POWER PROTECT . 
5Vdc SHORT to GND , POWER PROTECT . 
-8Vdc SHORT to GND , POWER PROTECT . 
 
1-4 . LOW POWER CONSUMPTION: Input 240Vac/50Hz Output NO LOAD , Power Consumption ≦0.5W . 1-5 . 
GROUND TEST :  1)  Test Requirements – Input Current : 25A   
– Measurement Time : 3sec   
– Temperature : 25 ℃± 5℃  
2)   A method of measurement : Injection current between U tility F.G. (inlet socket F.G.) and output ground (heat 
sink) 
3)   Criterion for Judging :  ≦Resistor 100mΩ 
  
						

							
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 1-6 . Insulation Resistance 
1)  Test Requirements – Input Voltage : 500Vdc   
– Temperature : 25 ℃± 5℃ 
2)   A method of measurement : Test between Utility (live  and neutral short) and output line (+ and - short). 
(insulation resistance test)   
3)   Criterion for Judging : Insulation resistance  ≧ 100MΩ 2. INVERTER TEST: 2-1. OPEN LAMP PROTECT 
TEST :   
Test Condition : ON/OFF PIN=3.3Vdc or 5.0Vdc , BL-Adj PIN=3.3Vdc or 5.0V dc . Result : CN901~CN904 
OPEN , INVERTER TURN ON CONTINUE 1~2 SECONDS SHUT DOWN .   
2-2. KICK-OFF VOLTAGE TEST : Test Condition : ON/OFF PIN= 3.3Vdc or 5.0Vdc , BL-Adj PIN=3.3Vdc or 5.0Vdc . 
Result :    CN901~CN903 TEST CN904 H.V PIN Output Voltage ≧1.5KV rms. 
CN902~CN904 CONNECT TEST CN901 H.V PIN Output Voltage ≧1.5KV rms .   
CN903 . CN904 . CN901 CONNECT TEST CN902 H.V PIN Output Voltage≧ 1.5KV rms . 
CN901 . CN902 . CN904 CONNECT TEST CN903 H.V PIN Output Voltage≧ 1.5KV rms .  
2-3 .    OUTPUT CURRENT TEST : 
  Test Condition   
Result 
CN802 Pin 
24V GND  CN802 
BL-Adj 
PIN 
  CN802 Pin 
ON/OFF 
  CN901~CN904 
 
    
6.5±0.5mA / 
50±5KHz  
22~28Vdc   3.3Vdc   3.3Vdc or 
5.0Vdc 
 17 or 19 
PANEL 
 7.0±0.5mA / 
50±5KHz 7.5±0.5mA 
/ 50±5KHz MEET L 
NEED
 
    
Jumper  
22~28Vdc   0Vdc  3.3Vdc or 
5.0Vdc 
 17 or 19 
PANEL 
  3.5±0.5mA 
 
22~28Vdc  0Vdc or 
3.3Vdc 
  0Vdc 
 17 or 19 
PANEL 
  NO Output 
  
						

							
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OLD TEST 
CN801 Input 100~240Vac , CN802 BL-Adj Pin CONNECT 3.3Vdc , CN802 ON/OFF Pin CONNECT 
3.3Vdc OR 5.0Vdc ,   
ATTENTION  1. WHEN OPERATION, WEAR STATIC ELECTRICITY RING AND KEEP GND. 
2.  TO PREVENT A SHORT CIRCUIT. 
3.  CON801 / C809 / C802 / C803 / BD801/ Q801 / T801/T802/T901/ THESE LARGE VOLUM MUST WEIGHT 
A LO T  
 
4.3 Scaler Board 
  „  17  and 19  LCD MONITOR 
„   WORK ENVIROMENT 1. WORK ENVIROMENT TEMPERATURE : 0  ℃ ∼40  ℃2. WORK ENVIROMENT 
humidity : 30%  ∼  85% RH . 3. STORE ENVIROMENT TEMPERATURE : －25℃∼＋85 ℃4. STORE 
ENVIROMENT humidity : 30%  ∼ 90% RH 
„   INPUT REQUIREMENT: AC Input Voltage :100Vac ~240Vac / 50~60Hz   
„   SPEC :   
NO   List   CH 1  CH 2   CH 3   CH4  
1   Channel Name  -8V(Optional)   +5V   +12V(Optional)   +24V  
2  OUTPUT VOLTAGE 
SPEC  -8V±10%   +5V±5%   +12V(11.5~13.5V)   +24V±10%  
  
     1. 900mA for  
3   OUPUT CURRENT SPEC 50mA   2500mA   200mA  Inverter 2. 50mA for 
SIP  
  
     PANEL(Optional)  
4  LOWEST WORK 
CURRENT   10mA  
400mA   50mA   10mA  
 WAITTING 5V         
5    Load=50~80mA ,    7V ~ 12V    4.75V ~ 5.25V  11.5V ~ 16V    22.6V~30V   
        
6   Ripple & Noise   200mVp-p   100mVp-p   300mVp-p   300mVp-p  
 
„  WAITTING MERIT : AC INPUT 240Vac , NO Load   
„   (L=80mm) INTRODUCTION :