ViewSonic VA2251m-LED User manual

VA2251-LED
VA2251m-LED
VA2251m-TAA
LCD Display
User Guide
Model No. VS14589
IMPORTANT: Please read this User Guide to obtain important information on installing
and using your product in a safe manner, as well as registering your product for future
service. Warranty information contained in this User Guide will describe your limited
coverage from ViewSonic Corporation, which is also found on our web site at http://
www.viewsonic.com in English, or in specific languages using the Regional selection
box in the upper right corner of our website. "Antes de operar su equipo lea cu
idadosamente las instrucciones en este manual"

TCO Information
Congratulations!
This display is designed for both you and the planet!
The display you have just purchased carries the TCO Certified
label. This ensures that your display is designed, manufactured
and tested according to some of the strictest quality and
environmental requirements in the world. This makes for a high
performance product, designed with the user in focus that also
minimizes the impact on the climate and our natural
environment.
TCO Certified is a third party verified program, where every product model is tested by an
accredited impartial test laboratory. TCO Certified represents one of the toughest certifications
for displays worldwide.
Some of the Usability features of the TCO Certified for displays:
• Good visual ergonomics and image quality is tested to ensure top performance and reduce
sight and strain problems. Important parameters are luminance, contrast, resolution, black
level, gamma curve, color and luminance uniformity, color rendition and image stability.
• Product have been tested according to rigorous safety standards at an impartial laboratory.
• Electric and magnetic fields emissions as low as normal household background levels.
• Low acoustic noise emissions.
Some of the Environmental features of the TCO Certified for displays:
• The brand owner demonstrates corporate social responsibility and has a certified
environmental management system (EMAS or ISO 14001).
• Very low energy consumption both in on- and standby mode minimize climate impact.
• Restrictions on chlorinated and brominated flame retardants, plasticizers, plastics and heavy
metals such as cadmium, mercury and lead (RoHS compliance).
• Both product and product packaging is prepared for recycling.
• The brand owner offers take-back options.
The requirements can be downloaded from our web site. The requirements included in this
label have been developed by TCO Development in co-operation with scientists, experts, users
as well as manufacturers all over the world. Since the end of the 1980s TCO has been involved
in influencing the development of IT equipment in a more user-friendly direction.
Our labeling system started with displays in 1992 and is now requested by users and
ITmanufacturers all over the world. About 50% of all displays worldwide are TCO certified.
For displays with glossy bezels the user should consider the placement of the display as
the bezel may cause disturbing reflections from surrounding light and bright surfaces.
For more information, please visit
www.tcodevelopment.com

Contents
Compliance Information.............................................................................. 1
Important Safety Instructions...................................................................... 2
Declaration of RoHS Compliance............................................................... 3
Copyright Information ................................................................................. 4
Product Registration................................................................................... 4
Getting Started
Package Contents ...................................................................................... 5
Precautions ................................................................................................ 5
Quick Installation ........................................................................................ 6
Wall Mounting (Optional) ............................................................................ 7
Using the LCD Display
Setting the Timing Mode............................................................................. 8
OSD and Power Lock Settings................................................................... 8
Adjusting the Screen Image ....................................................................... 9
Main Menu Controls ................................................................................. 12
Other Information
Specifications ........................................................................................... 16
Troubleshooting........................................................................................ 17
Customer Support .................................................................................... 18
Cleaning the LCD Display ........................................................................ 19
Limited Warranty ...................................................................................... 20
Mexico Limited Warranty .......................................................................... 22

1
Compliance Information
For U.S.A.
This device complies with part 15 of FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses, and can radiate radio frequency energy, and if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
Warning: You are cautioned that changes or modifications not expressly approved by the
party responsible for compliance could void your authority to operate the equipment.
For Canada
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
CE Conformity for European Countries
The device complies with the EMC Directive 2004/108/EC and Low Voltage
Directive 2006/95/EC.
Following information is only for EU-member states:
The mark shown to the right is in compliance with the Waste Electrical and
Electronic Equipment Directive 2002/96/EC (WEEE).
The mark indicates the requirement NOT to dispose the equipment as unsorted
municipal waste, but use the return and collection systems according to local law.

2
Important Safety Instructions
1. Read these instructions completely before using the equipment.
2. Keep these instructions in a safe place.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this equipment near water. Warning: To reduce the risk of fire or electric shock,
do not expose this apparatus to rain or moisture.
6. Clean with a soft, dry cloth. If further cleaning is required, see “Cleaning the Display” in
this guide for further instructions.
7. Do not block any ventilation openings. Install the equipment in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other
devices (including amplifiers) that produce heat.
9. Do not attempt to circumvent the safety provisions of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wide blade and the third prong are
provided for your safety. If the plug does not fit into your outlet, consult an electrician for
replacement of the outlet.
10. Protect the power cord from being tread upon or pinched, particularly at the plug, and the
point where if emerges from the equipment. Be sure that the power outlet is located near
the equipment so that it is easily accessible.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the equipment. When a cart is used, use caution
when moving the cart/equipment combination to avoid injury from tipping
over.
13. Unplug this equipment when it will be unused for long periods of time.
14. Refer all servicing to qualified service personnel. Service is required when the unit has
been damaged in any way, such as: if the power-supply cord or plug is damaged, if liquid
is spilled onto or objects fall into the unit, if the unit is exposed to rain or moisture, or if
the unit does not operate normally or has been dropped.

3
Declaration of RoHS Compliance
This product has been designed and manufactured in compliance with Directive 2002/95/EC of
the European Parliament and the Council on restriction of the use of certain hazardous
substances in electrical and electronic equipment (RoHS Directive) and is deemed to comply
with the maximum concentration values issued by the European Technical Adaptation
Committee (TAC) as shown below:
Certain components of products as stated above are exempted under the Annex of the RoHS
Directives as noted below:
Examples of exempted components are:
1. Mercury in compact fluorescent lamps not exceeding 5 mg per lamp and in other lamps not
specifically mentioned in the Annex of RoHS Directive.
2. Lead in glass of cathode ray tubes, electronic components, fluorescent tubes, and electronic
ceramic parts (e.g. piezoelectronic devices).
3. Lead in high temperature type solders (i.e. lead-based alloys containing 85% by weight or
more lead).
4. Lead as an allotting element in steel containing up to 0.35% lead by weight, aluminium
containing up to 0.4% lead by weight and as a cooper alloy containing up to 4% lead by
weight.
Substance Proposed Maximum Concentration Actual Concentration
Lead (Pb) 0.1% < 0.1%
Mercury (Hg) 0.1% < 0.1%
Cadmium (Cd) 0.01% < 0.01%
Hexavalent Chromium (Cr6+)0.1% < 0.1%
Polybrominated biphenyls (PBB) 0.1% < 0.1%
Polybrominated diphenyl ethers (PBDE) 0.1% < 0.1%

4
Copyright Information
Copyright © ViewSonic®Corporation, 2012. All rights reserved.
Macintosh and Power Macintosh are registered trademarks of Apple Inc.
Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of
Microsoft Corporation in the United States and other countries.
ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered
trademarks of ViewSonic Corporation.
VESA is a registered trademark of the Video Electronics Standards Association. DPMS and
DDC are trademarks of VESA.
ENERGY STAR®is a registered trademark of the U.S. Environmental Protection Agency (EPA).
As an ENERGY STAR®partner, ViewSonic Corporation has determined that this product meets
the ENERGY STAR®guidelines for energy efficiency.
Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or
omissions contained herein; nor for incidental or consequential damages resulting from
furnishing this material, or the performance or use of this product.
In the interest of continuing product improvement, ViewSonic Corporation reserves the right
to change product specifications without notice. Information in this document may change
without notice.
No part of this document may be copied, reproduced, or transmitted by any means, for any
purpose without prior written permission from ViewSonic Corporation.
Product Registration
To meet your future needs, and to receive any additional product information as it becomes
available, please register your product on the Internet at: www.viewsonic.com. The ViewSonic
Wizard CD-ROM also provides an opportunity for you to print the registration form, which
you may mail or fax to ViewSonic.
Product disposal at end of product life
ViewSonic respects the environment and is committed to working and living green. Thank you
for being part of Smarter, Greener Computing. Please visit ViewSonic website to learn more.
USA & Canada: http://www.viewsonic.com/company/green/recycle-program/
Europe: http://www.viewsoniceurope.com/uk/kbase/article.php?id=639
Taiwan: http://recycle.epa.gov.tw/recycle/index2.aspx
For Your Records
Product Name:
Model Number:
Document Number:
Serial Number:
Purchase Date:
VA2251/m-LED/m-TAA
ViewSonic Widescreen LCD Display
VS14589
VA2251/m-LED/m-TAA-1_UG_ENG Rev. 1A 02-02-12
__________________________________________
__________________________________________

5
Getting Started
Congratulations on your purchase of a ViewSonic®LCD display.
Important! Save the original box and all packing material for future shipping needs.
NOTE: The word “Windows” in this user guide refers to the following Microsoft operating
systems: Windows Vista, and Windows 7.
Package Contents
Your LCD display package includes:
•LCDdisplay
• Power cord
• Audio cable (stereo mini jack, for VA2251m-LED/VA2251m-TAA only)
• D-Sub cable (available in some countries only)
• ViewSonic Wizard CD-ROM (available in some countries only)
• Quick Start Guide
NOTE: The CD includes the User Guide PDF files and INF/ICM display optimization files.
The INF file ensures compatibility with Windows operating systems, and the ICM file (Image
Color Matching) ensures accurate on-screen colors. ViewSonic recommends that you install
both the INF and ICM files.
Precautions
• Sit at least 18” from the LCD display.
•Avoid touching the screen. Skin oils are
difficult to remove.
•Never remove the rear cover. This LCD
display contains high-voltage parts. You
may be seriously injured if you touch
them.
• Avoid exposing the LCD display to direct
sunlight or another heat source. Orient the
LCD display away from direct sunlight to
reduce glare.
• Always handle the LCD display with care
when moving it.
• Place the LCD display in a well ventilated
area. Do not place anything on the LCD
display that prevents heat dissipation.
• Ensure the area around the LCD display is
clean and free of moisture.
• Do not place heavy objects on the LCD
display, video cable, or power cord.
• If smoke, an abnormal noise, or a strange
odor is present, immediately switch the
LCD display off and call your dealer or
ViewSonic. It is dangerous to continue
using the LCD display.
• Do not rub or apply pressure to the LCD
panel, as it may permanently damage the
screen.

6
Quick InstallationQuick Installation
1. Connect power cord (and AC/DC
adapter if required)
2. Connect video cable
• Make sure both the LCD display and
computer are turned OFF
• Remove rear panel covers if necessary
• Connect the video cable from the LCD
display to the computer
Macintosh users: Models older than G3
require a Macintosh adapter. Attach the
adapter to the computer and plug the video
cable into the adapter.
To order a ViewSonic®Macintosh
adapter, contact ViewSonic Customer
Support.
3. Turn ON LCD display and computer
Turn ON the LCD display, then turn ON
the computer. This sequence (LCD display
before computer) is important.
NOTE: Windows users may receive a
message asking them to install the INF
file. This is on the CD.
4. Insert the ViewSonic Wizard CD into
the computer’s CD drive.
Follow the on-screen instructions. If your
computer does not have a CD-ROM drive,
please refer to Customer Support page.
• Wait for the CD-ROM to auto-start.
NOTE: If the CD-ROM does not auto-
start: double-click on the CD-ROM icon
in the Windows Explorer, then double-
click on viewsonic.exe.
• Follow the on-screen instructions.
5. Windows users: Set the timing mode
(resolution and refresh rate)
Example: 1920 x 1080 @ 60 Hz.
For instructions on changing the
resolution and refresh rate, see the
graphics card’s user guide.
Installation is complete. Enjoy your new
ViewSonic LCD display.
To be best prepared for any future
customer service needs: print this user
guide and write the serial number in “For
Your Records” on page 4. (See back of
LCD display.)
You can register your product online at the
ViewSonic website for your region. See
the Customer Support table in this guide.
The ViewSonic Wizard CD-ROM also
provides an opportunity for you to print
the registration form which you may mail
or fax to ViewSonic.
Power Cord
AC Outlet
(Wall Socket)
Audio In (For VA2251m-LED/
VA2251m-TAA only)
AC IN
DVI
D-Sub
Computer Power Cord

7
Wall Mounting (Optional) For use only with UL Listed Wall Mount Bracket
To obtain a wall-mounting kit or height adjustment base, contact ViewSonic®or your local
dealer. Refer to the instructions that come with the base mounting kit. To convert your LCD
display from a desk-mounted to a wall-mounted display, do the following:
Step 1. Verify that the power button is turned Off, then disconnect the power cord.
Step 2. Lay the LCD display face down on a towel or blanket.
Step 3. Remove the four screws attaching the base.
Step 4. Attach the mounting bracket from the VESA compatible wall mounting kit (100 mm
x 100 mm distance), using screws of correct length.
Step 5. Attach the LCD display to the wall, following the instructions in the wall-mounting
kit.
Step 4. Four VESA
screw holes
Step 3. 3 screw
attaching the base

8
Using the LCD Display
Setting the Timing Mode
Setting the timing mode is important for maximizing the quality of the screen image and
minimizing eye strain. The timing mode consists of the resolution (example 1920 x 1080) and
refresh rate (or vertical frequency; example 60 Hz). After setting the timing mode, use the
OSD (On-screen Display) controls to adjust the screen image.
For the best picture quality set your LCD display timing mode to:
VESA 1920 x 1080 @ 60Hz.
To set the Timing Mode:
1. Set the resolution: Right-click on the Windows desktop > Properties > Settings > set the
resolution.
2. Set the refresh rate: See your graphic card's user guide for instructions.
WARNING: Do not set the graphics card in your computer to exceed the maximum refresh
rate of 75Hz; doing so may result in permanent damage to your LCD display.
OSD and Power Lock Settings
•OSD Lock: Press and hold [1] and the up arrow for 10 seconds. If any buttons are
pressed the message OSD Locked will display for 3 seconds.
•OSD Unlock: Press and hold [1] and the up arrow again for 10 seconds.
•Power Button Lock: Press and hold [1] and the down arrow for 10 seconds. If the
power button is pressed the message Power Button Locked will display for 3 seconds. With
or without this setting, after a power failure, your LCD display’s power will automatically
turn ON when power is restored.
•Power Button Unlock: Press and hold [1] and the down arrow again for 10 seconds.

9
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 12.
VA2251m-LED/VA2251m-TAA
Scrolls through menu options and adjusts the
displayed control.
Audio Adjust () / Contrast ()
Power light
Blue = ON
Orange = Power Saving
Displays the control screen for
the highlighted control.
Also toggles between two
controls on some screens.
Also a shortcut to toggle analog
and digital connection.
Displays the Main
Menu or exits the
control screen and
saves adjustments.
Main Menu
with OSD controls
Front Control Panel
shown below in detail

10
VA2251-LED
Scrolls through menu options and adjusts the
displayed control.
Also a shortcut to display the Contrast adjustment
control screen.
Power light
Blue = ON
Orange = Power Saving
Displays the control screen for
the highlighted control.
Also toggles between two
controls on some screens.
Also a shortcut to toggle analog
and digital connection.
Displays the Main
Menu or exits the
control screen and
saves adjustments.
Main Menu
with OSD controls
Front Control Panel
shown below in detail

11
Do the following to adjust 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orto scroll up or down in the Main Menu.
3. After the desired control is selected, press button [2]. A control screen like the one shown
below appears.
4. To adjust the control, 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 computer's graphics card so that it outputs a 1920 x 1080 @ 60Hz video signal to
the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's
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 “active area” of the LCD display.)
VA2251m-LED/VA2251m-TAA VA2251-LED
The line at the bottom of the screen shows
the current functions of buttons 1 and 2:
Exit or select the Brightness control.

12
Main Menu Controls
Adjust the menu items shown below by using the up and down buttons.
Control Explanation
Auto Image Adjust automatically sizes, centers, and fine tunes the video signal
to eliminate waviness and distortion. Press the [2] button to obtain a sharper
image.
NOTE: Auto Image Adjust works with most common video cards. If this
function does not work on your LCD display, then lower the video refresh rate
to 60 Hz and set the resolution to its pre-set value.
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 have more than one computer
connected to the LCD Display.
Audio Adjust (For VA2251m-LED/VA2251m-TAA only)
Volume increases the volume, decreases the volume, and mutes the audio.
Mute temporarily silences audio output.

13
Control Explanation
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 native.
sRGB-This is quickly becoming the industry standard for color management,
with support being included in many of the 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 adjustments to be disabled.
Bluish (9300)-Adds blue to the screen image for cooler white (used in most
office settings with fluorescent lighting).
Cool (7500)-Adds blue to the screen image for cooler white (used in most office
settings with fluorescent lighting).
Native (6500)-Adds red to the screen image for warmer white and richer red.
Warm (5000)-Adds red to the screen image for warmer white and richer red.
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 when the product is
set to a Preset Timing Mode, colors return to the Native factory preset.

14
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 1920 x 1080 @ 60Hz (recommended) means that the resolution
is 1920 x 1080 and the refresh rate is 60 Hertz.
Manual Image Adjust displays the Manual Image Adjust menu.
H./V. Position (Horizontal/Vertical Position) moves the screen image left or
right and up or down.
H. Size (Horizontal Size) adjusts the width of the screen image.
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 focus of the screen image.

15
Control Explanation
Dynamic Contrast allows the user to turn the contrast ratio enhancement on or
off.
Aspect ratio Selects the image size for 4:3 and full screen.
ECO Mode provides the lower power consumption by reducing the brightness.
Standard: The default brightness setting.
Optimize: Decreases the brightness by 25 %.
Conserve: Decreases the brightness by 50 %.
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 advises the optimal resolution to use.
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 “15 second” setting, if a control is not pushed within 15 seconds, the
display screen disappears.
OSD Background allows the user to turn the OSD background On or Off.
Auto Power Off, if enabled, will power off the display automatically when no
signal is detected for 3 minutes.
Power Indicator allows the user to select the Power Indicator On/Off for Power
On/Off mode.
Memory Recall returns the adjustments back to factory settings if the display is
operating in a supported timing mode listed in the specification of this manual.
Exception: This control does not affect changes made with the Language Select
or Power Lock setting.

16
Other Information
Specifications
1Macintosh computers older than G3 require a ViewSonic®Macintosh adapter. To order an adapter, contact
ViewSonic.
LCD Type
Display Size
Color Filter
Glass Surface
TFT (Thin Film Transistor), Active Matrix 1920 x 1080 LCD,
0.24825 mm pixel pitch
Metric: 55cm
Imperial: 22” (21.5” viewable)
RGB vertical stripe
Anti-Glare
Input Signal Video Sync RGB analog (0.7/1.0 Vp-p, 75 ohms) / TMDS Digital (100ohms)
Separate Sync
fh:24-82 kHz, fv:50-75 Hz
Compatibility PC
Macintosh1
Up to 1920 x 1080 Non-interlaced
Power Macintosh up to 1920 x 1080
Resolution Recommended
and supported
1920 x 1080 @ 60 Hz
1680 x 1050 @ 60 Hz
1600 x 1200 @ 60 Hz
1440 x 900 @ 60, 75 Hz
1280 x 1024 @ 60, 75 Hz
1024 x 768 @ 60, 70, 72, 75 Hz
800 x 600 @ 56, 60, 72, 75 Hz
640 x 480 @ 60, 75 Hz
720 x 400 @ 70 Hz
Power Voltage 100-240 VAC, 50/60 Hz (auto switch)
Display area Full Scan 476.6 mm (H) x 268.11 mm (V)
18.77" (H) x 10.56" (V)
Operating
conditions
Temperature
Humidity
Altitude
+32° F to +104° F (0° C to +40° C)
20% to 90% (non-condensing)
To 10,000 feet
Storage
conditions
Temperature
Humidity
Altitude
-4° F to +140° F (-20° C to +60° C)
5% to 90% (non-condensing)
To 40,000 feet
Dimensions Physical 512.44 mm (W) x 390.56 mm (H) x 199.30 mm (D)
20.17" (W) x 15.38" (H) x 7.85" (D)
Weight Physical 7.67 lbs (3.48 kg)
Power saving
modes
On
Off
22W (Typical) (VA2251-LED) (blue LED)
26W (Typical) (VA2251m-LED/VA2251m-TAA) (blue LED)
<0.5W
Warning: Do not set the graphics card in your computer to exceed these refresh rates; doing so may result in
permanent damage to the LCD display.

17
Troubleshooting
No power
• Make sure power button (or switch) is ON.
• Make sure A/C power cord is securely connected to the LCD display.
• Plug another electrical device (like a radio) into the power outlet to verify that the outlet is
supplying proper voltage.
Power is ON but no screen image
• Make sure the video cable supplied with the LCD display is tightly secured to the video
output port on the back of the computer. If the other end of the video cable is not attached
permanently to the LCD display, tightly secure it to the LCD display.
• Adjust brightness and contrast.
• If you are using an Macintosh older than G3, you need a Macintosh adapter.
Wrong or abnormal colors
• If any colors (red, green, or blue) are missing, check the video cable to make sure it is
securely connected. Loose or broken pins in the cable connector could cause an improper
connection.
• Connect the LCD display to another computer.
• If you have an older graphics card, contact ViewSonic®for a non-DDC adapter.
Control buttons do not work
• Press only one button at a time.