LG 42LS75C, 49LS75C, 55LS75C, 42LS73C, 49LS73C User Guide

...

OWNER’S MANUAL

LG Digital Signage
(MONITOR SIGNAGE)
Please read this manual carefully before operating your set and retain it for future reference.
42LS75C
49LS75C
55LS75C
42LS73C
49LS73C
55LS73C
www.lg.com
2
TABLE OF CONTENTS
ENGLISH
IMPORTANT PRECAUTIONS .........3
- Electrical Power Related Precautions ....................3
- Precautions for installing the Product ..................5
- Precautions for Moving the Product ......................6
- Precautions for Using/Cleaning the Product .....7
- Product Disposal (Only, Hg lamp used LCD
Monitor) .................................................................................7
LICENSES .......................................8
ASSEMBLY AND PREPARATION ..9
- Optional Accessories ....................................................10
- Parts and Buttons .........................................................12
- Connecting the Stand ................................................. 13
- Connecting the Speakers ..........................................14
- IR & Light Sensor Connection ................................. 15
- Portrait Layout ................................................................16
- Attaching and removing the LG Logo
Bracket ................................................................................17
- Installing on a Wall ........................................................19
REMOTE CONTROL .................... 22
MAKING CONNECTIONS ........... 24
- Connecting to a PC.......................................................24
- External Device Connection .....................................24
- Daisy Chain Monitors ..................................................26
- Using the Input List ......................................................27
TROUBLESHOOTING .................. 28
PRODUCT SPECIFICATIONS ...... 31
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WARNING -This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

IMPORTANT PRECAUTIONS

Please read these safety precautions carefully before using the product.
WARNING
Failure to follow those warnings may result in death, serious injury or damage to the product or other property.
CAUTION
If you ignore the caution message, you may be slightly injured or the product may be damaged.
WARNING
• Indoor Use Only.

Electrical Power Related Precautions

WARNING
• Use only the power cord supplied with the unit or another manufacturer’s authorized cord.
- Failure to do so may result in fire or electrical shock or damage to the product.
• Use only a properly grounded plug and receptacle.
- If you do not you may be electrocuted or injured. Or the product might be damaged.
• Do not use a damaged or loose plug.
- This may cause electrical shock or fire.
• Operate the display only from a power source(i.e. voltage) indicated in the product specification.
- Otherwise the product can be damaged, fire can occur or you may be electrocuted. If you are not sure what type of power supply you have, consult a certified electrician.
• In the presence of thunder and lightning, never touch the power cord and signal cable because it can be very
dangerous.
- It can cause electric shock.
• Do not connect several extension cords, electrical appliances or electrical heaters to a single outlet. Use a power strip
with a grounding terminal designed for exclusive use with the computer.
- A fire can break out due to overheating.
• Do not touch the power plug with wet hands. Additionally, if the cord pin is wet or covered with dust, dry the power
plug completely or wipe dust off before plugging in the cord.
- You may be electrocuted due to excess moisture.
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4
• If you don’t intend to use the product for a long time, unplug the power cable from the product.
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- Layers of dust can cause a fire, or insulation deterioration can cause electric leakage, electric shock or fire.
• Insert the power plug firm so it cannot come loose.
- A loose connection can cause fire.
• Hold the plug when pulling out the power cable. Do not pull the plug out by the wire. Do not bend the power cord
with excessive force or put heavy objects on the power cord.
- The power line can be damaged, which may cause electric shock or fire.
• Do not insert metal or other conductive materials into the product openings. Additionally, do not touch the power
cable right after plugging into the wall input terminal.
- You may be electrocuted.
• Use an appliance coupler as a disconnect device.
• Please make sure the device is installed near the wall outlet to which it is connected and that the outlet is easily
accessible.
• Do not unplug the power cord while the product is in use.
- Electrical shock can damage the product.
• As long as this unit is connected to the AC wall outlet, it is not disconnected from the AC power source even if the
unit is turned off.
5

Precautions for installing the Product

WARNING
• Keep away from heat sources like heaters or open flames.
- Electrical shock, fire, malfunction or deformation may occur.
• Keep the packing anti-moisture material or vinyl packing out of the reach of children.
- Anti-moisture material is harmful if swallowed. If swallowed by mistake, force the patient to vomit and visit the nearest hospital. Additionally, vinyl packing can cause suffocation. Keep it out of the reach of children.
• Do not put heavy objects on the product or sit upon it.
- If the product collapses or is dropped, you may be injured. Prevent Children from climbing or pulling on the unit.
• Do not leave the power or signal cable where someone can trip over it.
- Pedestrians may become entangled in the cables and cause the device to become damaged causing electrical shock, fire, or serious injury.
• Install the product in a neat and dry place. Do not use near water.
- Dust or moisture can cause electrical shock, fire or product damage.
• Do not add accessories that have not been designed for this display.
• If you smell smoke or other odors or hear a strange sound from the product unplug the power cord and contact LG
Customer Service.
- If you continue to use without taking proper measures, electrical shock or fire can occur.
• If you dropped the product or the case is broken, turn off the product and unplug the power cord.
- If you continue to use without taking proper measures, electrical shock or fire can occur. Contact LG Customer Service.
• Do not drop an object on or apply impact to the product. Do not throw any toys or objects at the product.
- It can cause injury to humans, problems to the product and damage the display.
• Keep out of reach of children and do not place toys near the product.
• Make sure the product ventilation hole is not blocked. Install the product more than 100 mm (3.9 inches) from the
wall.
- If you install the product too close to the wall, it may be deformed or fire can break out due to internal heat build­up.
• Do not cover the product with cloth or other material (eg. plastic) while plugged in.
- The product can be deformed or fire can break out due to internal overheating.
• Place the product on a flat and stable surface that is large enough to support the product.
- If the product is dropped, you may be injured or the product may be broken.
• Install the product where no Electromagnetic Interference occurs.
• Keep the product away from direct sunlight.
- The product can be damaged.
• Do not place the product on the floor.
- Small Children and others may trip over it.
• Do not install this product on a wall if it could be exposed to oil or oil mist.
- This may damage the product and cause it to fall.
• For displays with glossy bezels the user should consider the placement of the display as the bezel may cause
unwanted reflections from surrounding light and bright surfaces.
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6

Precautions for Moving the Product

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WARNING
• Make sure to turn off the product.
- You may be electrocuted or the product can be damaged.
• Make sure to remove all cables before moving the product.
- You may be electrocuted or the product can be damaged.
• When lifting or moving the product, do not hold it upside down while holding only the stand.
- This may cause the product to fall resulting in damage or injury.
• Do not shock the product when moving it.
- You may be electrocuted or the product can be damaged.
• Make sure the panel faces forward and hold it with both hands to move.
- If you drop the product, the damaged product can cause electric shock or fire.
• Do not place the product face down.
- This may damage the TFT-LCD screen.
7

Precautions for Using/Cleaning the Product

WARNING
• Do not attempt to disassemble, repair or modify the product yourself.
- Fire or electric shock can occur.
- Contact LG Customer Service for repair.
• When cleaning the product, unplug the power cord and scrub gently with a soft cloth to prevent scratching. Do not
clean with a wet cloth or spray water or other liquids directly onto the product. An electric shock may occur. (Do not use chemicals such as benzene, paint thinners or alcohol.)
• Keep the product away from water.
- Fire or electric shock accident can occur.
• Avoid high temperatures and humidity.
• Do not put or store flammable substances near the product.
- There is a danger of explosion or fire.
• Keep the product clean at all times.
• Take a comfortable and natural position when working with the product.
• Take a regular break when working with the product for a long time.
• Do not press on the panel with a hand or sharp object such as nail, pencil or pen, or make a scratch on it.
• Keep proper distance from the product and rest from time-to-time.
- Your vision may be impaired if you look at the product too closely or for too long.
• Set the appropriate resolution by referring to the User’s Guide.
• Keep small accessories out of the reach of children.
• Displaying a still image for long time on the monitor may leave persistent image or stain on the monitor screen. To
avoid this problem, use a screen saver and power off when this product is not used. Persistent image or stain caused by long time usage are not covered by the warranty on this product.
• Do not use products using high voltage around the Monitor. (ex. Electrical Swatter)
- Monitor may have malfunction as its electrical shock.
• Spray water onto a soft cloth 2 to 4 times, and use it to clean the front frame;wipe in one direction only. Too much
moisture may cause staining.
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WATER
CHEMICALS

Product Disposal (Only, Hg lamp used LCD Monitor)

• The fluorescent lamp used in this product contains a small amount of mercury.
• Do not dispose of this product with general household waste.
• Disposal of this product must be carried out in accordance to the regulations of your local authority.
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LICENSES

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Supported licenses may differ by model. For more information of the licenses, visit www.lg.com.
The terms HDMI and HDMI High-Definition Multimedia Interface, and the HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries.
Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby Laboratories.
For DTS patents, see http://patents.dts.com. Manufactured under license from DTS Licensing Limited. DTS, the Symbol, & DTS and the Symbol together, DTS 2.0 Channel, DTS 2.0+Digital Out, DTS-HD, and DTS Virtual:X are registered trademarks or trademarks of DTS, Inc. in the United States and/or other countries. © DTS, Inc. All Rights Reserved.
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ASSEMBLY AND PREPARATION

CAUTION
• Always use genuine components to ensure safety and product performance.
• The product warranty will not cover damage or injury caused by the use of counterfeit components.
NOTE
• The accessories provided with your product may vary depending on the model or region.
• Product specifications or contents in this manual may be changed without prior notice due to upgrade of product
functions.
• SuperSign Software & Manual
- Downloading from the LG Electronics website.
- Visit the LG Electronics website (
• The warranty will not cover any damage caused by using the product in an excessively dusty environment.
http://partner.lge.com
) and download the latest software for your model.
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Optional Accessories

ENGLISH
Without prior notice, optional accessories are subject to change to improve the performance of the product, and new accessories may be added. The illustrations in this manual may differ from the actual product and accessories.
Stand kit
Screws
Stand
ST-200T
Speaker kit
Diameter 4.0 mm x Pitch 0.7 mm x Length 10 mm
(Diameter 0.1 inches x Pitch 0.02 inches x Length 0.3
inches)
(including spring washer)
Speakers SP-2100
Media Player
MP500/ MP700
Cable holder/
Cable Tie
Screws
Diameter 4.0 mm x
Pitch 0.7 mm x Length 8 mm
(Diameter 0.1 inches x Pitch
0.02 inches x Length 0.3 inches)
(including spring washer)
Media Player kit
Screws CD (Owner's Manual)/ Cards
Pitch 1.6 mm x Length 10 mm
(Diameter 0.1 inches x Pitch
Screws
Diameter 4.0 mm x
0.06 inches x Length 0.3 inches)
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OPS kit
KT-OPSA Screws Connecting Cable
Card (Easy Setup Guide) Power Cord
Pixel sensor kit
KT-SP0
Wi-Fi Dongle kit
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AN-WF500
NOTE
• Cable holder/cable tie may not be available in some areas or for some models.
• Optional accessories are available for some models. If necessary, please purchase them separately.
• Pixel sensor is sold separately. You can obtain additional accessories from your local retail store.
• Before you attach the OPS kit or Media Player, connect the cable to the port.
• Please turn off the power before connecting or removing the Wi-Fi dongle kit.
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Parts and Buttons

ENGLISH
The image may be different according to the model.
Buttons
INPUT: Changes the input source.
MENU: Accesses the main menus, or saves your input and exits the menus.
: Adjust the up and down.
: Moves left and right.
AUTO/SET: Displays the current signal and mode.
/I: Turns the power on or off.
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Connecting the Stand

- For certain models only.
- The image may be different according to the model.
1
2
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Connecting the Speakers

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- For certain models only.
- The image may be different according to the model.
1 Connect an input signal cable before installing the speakers.
2 Mount the speakers by using screws as shown below. Make sure the power cable is disconnected before making a
connection.
3 Then connect the speaker cable. After installing your speakers, use the cable holders and cable ties to arrange the
speaker cables.
NOTE
• Please turn off the power before removing the cable. Connecting or removing the speaker cable while turned on may
result in no sound.
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IR & Light Sensor Connection

When the cable is connected to the product, the feature for receiving remote control signals is activated. The IR & Light sensor is magnetic. Attach it to the corner of the front side of the product for use.
[Front]
CAUTION CAUTION
NOTE
• The signal strength of the IR & Light sensor will decrease if it is not attached to the front of the product.
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Portrait Layout

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When installing in a portrait layout, rotate the monitor counterclockwise 90 degrees (when facing the screen).
Using Kensington Lock
(This is not available for all models.) The Kensington security system connector is located at the back of the monitor. For more information on installation
and use of this system, refer to the manual provided with the Kensington security system or visit
http://www.kensington.com
Connect the Kensington security system cable between the monitor and a table.
.
NOTE
• The Kensington security system is optional. You can obtain additional accessories from most electronics retail stores.
• The illustration shows a general example of installation and may look different from the actual product.
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Attaching and removing the LG Logo Bracket

- For certain models only.
- The image may be different according to the model.
Removing the LG Logo Bracket
1 Lay a clean cloth on the floor, and then put the monitor on it with the screen face down. Remove the two screws
that secure the LG Logo Bracket to the bottom of the rear side of the monitor using a screwdriver.
LG Logo Bracket
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2 After removing the screws, remove the LG Logo Bracket. When re-attaching the LG Logo Bracket, repeat the
process in reverse order.
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Attaching the LG Logo Bracket on the right side
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1 Lay a clean cloth on the floor, and then put the monitor on it with the screen face down. Remove the two screws
that secure the LG Logo Bracket to the bottom of the rear side of the monitor using a screwdriver.
2 After removing the screws, remove the LG Logo Bracket. Align the LG Logo Bracket with the holes on the right side
and then attach it using the two screws.
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Installing on a Wall

For proper ventilation, allow a clearance of 100 mm on each side and from the wall. Detailed installation instructions are available from your dealer, see the optional Tilt Wall Mounting Bracket Installation and Setup Guide.
100 mm
100 mm
100 mm
100 mm (3.9 inches)
To install your monitor on a wall, attach a wall mounting bracket (optional part) to the back of the monitor. Make sure that the wall mounting bracket is securely fixed to the monitor and to the wall.
1 Use only screws and wall mounting brackets that conform to VESA standards. 2 Screws which are longer than standard length may damage the inside of the monitor.
3 A non-VESA standard screw may damage the product and cause the monitor to fall. LG Electronics is not liable for
any accidents related to the use of non-standard screws.
4 Please use VESA standard as below.
• 785 mm (30.9 inches) and above
* Fixing screws: Diameter 6.0 mm x Pitch 1.0 mm x Length 12 mm (Diameter 0.2 inches x Pitch 0.03 inches x Length
0.4 inches)
100 mm
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785 mm
(30.9 inches)
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CAUTION
• Disconnect the power cord before moving or installing the monitor to avoid risk of electric shock.
• If you install the monitor on a ceiling or slanted wall, it may fall and result in injury. Use an authorized LG wall mount
and contact your local dealer or qualified personnel to assist with the installation.
• Do not over tighten the screws as this may damage the monitor and void your warranty.
• Use only screws and wall mounting brackets that meet the VESA standard. Any damage or injuries caused by misuse
or use of improper accessories are not covered by the warranty.
NOTE
• The wall mount kit includes the installation guide and all necessary parts.
• The wall mounting bracket is optional. You can obtain additional accessories from your local dealer.
• The length of screws required may differ depending on the wall mount. Be sure to use the correct length.
• For more information, please refer to the guide provided with the wall mount.
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Securing the monitor to a wall (optional)
(Procedure may differ depending on the model.)
1 Insert and tighten the eyebolts, or brackets and bolts on the back of the monitor.
- If there are already bolts inserted in the eyebolts’ position, remove the other bolts first.
2 Mount the wall brackets with the bolts to the wall. Match the location of the wall bracket and the eyebolts on the
rear of the monitor.
3 Connect the eyebolts and wall brackets tightly with a sturdy cord.
Make sure the securing cord is horizontal with the flat surface.
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WARNING
• If the monitor is not positioned in a sufficiently stable location, there is a danger that it will fall. Many injuries,
particularly to children, can be avoided by taking simple precautions such as:
- Using cabinets or stands recommended by the manufacturer.
- Only using furniture that can safely support the monitor.
- Ensuring the monitor is not overhanging the edge of the supporting furniture.
- Not placing the monitor on tall furniture (for example, cupboards or bookcases) without anchoring both the furniture and the monitor to a suitable support.
- Not placing cloth or other materials between the monitor and supporting furniture.
- Educating children about the dangers of climbing on furniture to reach the monitor or its controls.
CAUTION
• Make sure that children do not climb on or hang from the monitor.
NOTE
• Use a platform or cabinet that is large and strong enough to support the monitor securely.
• Brackets, bolts, and cords are sold separately. You can obtain additional accessories from your local retail store.
• The illustration shows a general example of installation and may look different from the actual product.
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REMOTE CONTROL

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The descriptions in this manual are based on the buttons on the remote control. Please read this manual carefully to use the monitor correctly. To install batteries, open the battery cover, place batteries (1.5 V AAA) matching and
terminals to the labels inside the compartment, and close the battery cover. To remove the batteries, perform the
installation actions in reverse. The illustrations may differ from the actual accessories.
CAUTION
• Do not mix old and new batteries, as this may damage the remote control.
• Be sure to point the remote control toward the remote control sensor on the monitor.
• Some features of the remote control may not be supported in certain models.
or
(POWER) Turns the monitor on or off.
Turns the monitor on.
Turns the monitor off.
Reduces power consumption by adjusting peak screen brightness.
Selects the input mode.
Used for viewing 3D videos.
Toggles between numerical and
alphabetical. Number and Alphabet buttons Enters
numerical or alphabetical characters depending upon the setting.
Deletes the entered numerical or
alphabetical character. Volume Up/Down Button Adjusts the
volume.
Selects the Aspect Ratio mode.
Automatically adjusts picture position and minimizes image instability (available for RGB input only).
Mutes all sounds.
Adjusts the brightness of the display. PAGE function is not supported in this model.
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Selects the Picture Mode.
Activates the Launcher.
Enters the White Balance menu.
Accesses the main menus
or saves your input and exit menus.
SuperSign menu key.
Navigation Buttons Scrolls through menus or options.
or
Selects menus or options and
confirms your input.
Allows you to move back one step
in the user interaction function.
Quit all OSD tasks and applications.
Allows you to control various multimedia devices to enjoy multimedia simply by using the remote control through the SimpLink menu.
Selects the TILE Mode.
When the Picture ID number matches the Set ID number, you can control whichever monitor you want in multi-display format.
USB Menu Control Buttons Controls media playback.
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MAKING CONNECTIONS

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You can connect various external devices to your monitor. Change the input mode and select the external device you want to connect. For more information about external device connections, see the user manual provided with each device.

Connecting to a PC

Some of the cables are not provided. This monitor supports the Plug and Play* feature.
* Plug and Play: a feature that enables a PC to recognize devices attached by the user without device configuration or
user intervention when powering up.

External Device Connection

Connect a HD receiver, DVD, or VCR player to the monitor and select an appropriate input mode. Some of the cables are not provided. For the best picture and sound quality, connecting external devices to your
monitor using HDMI cables is recommended.
25
NOTE
• For the best image quality, using the monitor with HDMI connection is recommended.
• To comply with the specifications of the product, use a shielded interface cable with ferrite core, such as a D-sub 15-
pin cable and DVI-D/HDMI cable.
• If you turn the monitor on when the set is cold, the screen may flicker. This is normal.
• Sometimes red, green, or blue spots may appear on the screen. This is normal.
• Use a High Speed HDMI®/TM cable.
• Use a certified cable with the HDMI logo attached. If you do not use a certified HDMI cable, the screen may not
display or a connection error may occur.
• Recommended HDMI Cable Types
- High-Speed HDMI®/TM Cable
- High-Speed HDMI®/TM Cable with Ethernet
• If you cannot hear any sound in HDMI mode please check your PC settings. Some PCs require you to manually change
the default audio output to HDMI.
• If you want to use HDMI-PC mode, you must set your PC/DTV to PC mode.
• You may experience compatibility issues if you use HDMI-PC mode.
• Make sure the power cable is disconnected.
• If you connect a gaming device to the monitor, use the cable provided with the gaming device.
• It is recommended to use the speakers that are provided as optional accessories.
• High Speed HDMI®/TM cables transmit a HD signal up to 1080p and higher.
CAUTION
• Connect the signal input cable and tighten it by turning the screws clockwise.
• Do not press the screen with your finger for a prolonged period as this may result in temporary distortion on the
screen.
• Avoid displaying static images on the screen for a long period of time to prevent image burn. Use a screensaver if
possible.
• A wireless communication device near your monitor can affect the image.
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26

Daisy Chain Monitors

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To use different products connected to each other, connect one end of the signal input cable (DP Cable) to the DP Out connector of Monitor 1 and connect the other end to the DP In connector of the other product.
* DP Cable - Use a DP cable that is certified to DP1.1a (SST), DP1.2 (MST) or higher.
NOTE
• If the signal is stable and there is no cable loss, in general, up to 100 monitors can be connected via the DP Out port
(at the recommended resolution). If you want to connect more than this number of monitors, use a booster.
• If you set the tile mode using DVI-D or HDMI, you will not be able to watch HDCP-encrypted content.
• If the signal cable between the product and your PC is too long, make sure to use the Booster or optical cable.
27

Using the Input List

• HDMI1 HDMI2 DISPLAYPORT OPS/DVI-D
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28

TROUBLESHOOTING

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No image is displayed.
Problem Action
Is the product power cord connected? • Check if the power cord is correctly plugged into the power outlet. Does the “Invalid Format” message
appear?
Does the “No Signal” message appear? • The signal cable between PC and product is not connected. Check the
The Unknown Product message appears when the product is connected.
Problem Action
Did you install the driver? • Check if the Plug and Play function is supported by referring to the
The screen image looks abnormal.
Problem Action
Is the screen position wrong? • Check if the graphics card resolution and frequency are supported by
The screen is displayed abnormally. • The proper input signal is not connected to the signal port. Connect the
• The signal from the PC (Graphics card) is out of the vertical or
horizontal frequency range of the product. Adjust the frequency range by referring to the Specifications in this manual.
signal cable.
• Press the INPUT menu in the remote control to check the input signal.
graphics card user manual.
the product. If the frequency is out of range, set to the recommended resolution in the [Control Panel] [Display] [Setting] menu. (The settings may differ depending on your operating system.)
signal cable that matches with the source input signal.
29
After-image appears on the product.
Problem Action
After-image appears when the product is turned off.
The audio function does not work.
Problem Action
No sound? • See if the audio cable is connected properly.
Sound is too dull. • Select the appropriate equalizer sound. Sound is too low. • Adjust the volume.
Screen color is abnormal.
Problem Action
Screen has poor color resolution (16 colors).
Screen color is unstable or mono-colored. • Check the connection status of the signal cable. Or, re-insert the PC
Do black spots appear on the screen? • Several pixels (red, green, blue, white, or black color) may appear on the
• If you use a fixed image for a long time, the pixels may be damaged.
Use the screen-saver function.
• When a dark image is displayed on the screen after an image with high
contrast (black and white or gray), this may cause image sticking. This is normal for LCD screen products.
• Adjust the volume.
• See if the sound is set properly.
• Set the number of colors to more than 24 bits (true color). Select
[Control Panel] [Display] [Settings] [Color Table] in Windows. (The settings may differ depending on your operating system.)
graphics card.
screen, which can be attributable to the unique characteristics of the LCD panel. This is not a malfunction of the LCD.
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The operation does not work normally.
Problem Action
The power suddenly turned off. • Is the Timer set?
• Check the power control settings. Power interrupted.
30
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CAUTION
• Image sticking does not occur when using constantly changing images but may occur when using a fixed image for an
extended period of time. Therefore, it is recommended that you use the instructions below to decrease the likelihood of image sticking occurring when using a fixed image. It is recommended that you change the screen at least once every 12 hours at the very minimum; if done more frequently, the prevention of image sticking is more effective.
Recommended operating conditions
1 Change the background and the character colors using the same time interval.
ID: UPM 123 PW: ****
When changing colors, using complementary colors helps to prevent image sticking.
BM BM BM
CF
ITO or MoTi Pixel Layer
Glass
OC
PI
LC
PI
TFT Layers
Glass
ID: UPM 123 PW: ****
CFCFCF
2 Change the image using the same time interval.
Make sure that the characters or images before changing the image remain in the same location after changing the image.
What is image sticking?
When the LCD panel displays a static image for an extended period of time, it can cause a voltage difference between the electrodes that operate the liquid crystals. When the voltage difference between the electrodes builds up over time, liquid crystals have a tendency to remain aligned in one direction. During this process, a previously displayed image remains visible. This phenomenon is referred to as image sticking.
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