LG 24U421A - Monitor

24U421A - Monitor LG - Free user manual and instructions

Find the device manual for free 24U421A LG in PDF.

📄 168 pages English EN Download 💬 AI Question 11 questions ⚙️ Specs
Notice LG 24U421A - page 30
Pick your language and provide your email: we'll send you a specifically translated version.
Product Type LCD Monitor
Screen Size 24 inches (estimation)
Resolution 1920 x 1080 (FHD, estimation)
Power Supply External power adapter supplied, 100-240 V
Power Consumption (Active) Approx. 25 W (estimation)
Power Consumption (Standby) Less than 0.5 W (estimation)
Dimensions (without stand) 55 x 33 x 5 cm (estimation)
Weight (without stand) 3.5 kg (estimation)
Power Saving Modes Active, Standby, Switched Off (DPMS)
DDC Protocol DDC1/DDC2B, DDC2AB/DDC2B+/DDC2Bi, E-DDC
Frame Material Glossy (depending on model)
Recommended Cleaning Soft cloth slightly dampened, do not use chemicals
Installation Precautions Avoid humidity, heat sources, and inclined surfaces
Electrical Safety Use only the supplied cord, do not open the casing
Repairability Contact a qualified technician, do not attempt to repair yourself

Frequently Asked Questions - 24U421A LG

What type of power cord should I use?
Use only the power cord supplied with the device or a cord compliant with your country's standards. If in doubt, contact the manufacturer or an authorized service center.
How do I clean the monitor screen?
First unplug the monitor. Use a soft cloth slightly dampened with water only. Never use aerosol sprays, chemicals like benzene or alcohol, and do not spray liquid directly onto the screen.
Is it normal for the screen to make clicking sounds?
Yes, it is normal for some monitors to emit occasional sounds when powering on, off, or changing video modes. If the sounds are continuous, contact a technician.
What should I do if the monitor does not power on?
Check that the power cord is properly connected and that the wall outlet works. If the problem persists, contact an authorized service center.
How do I activate power saving mode?
The monitor supports the VESA DPMS protocol. When connected to a compatible PC, it automatically enters standby or switched off mode according to the PC's power settings.
Can I repair the monitor myself?
No, never open the monitor as it contains dangerous high voltages. Have any repairs carried out by a qualified technician.
What precautions should I take to prevent image retention?
Avoid displaying a fixed image for an extended period. Use a screen saver and turn off the screen when not in use. The warranty does not cover image retention.
How do I install the monitor safely?
Place the monitor on a stable, flat surface away from heat sources and moisture. Do not block the ventilation openings. Use only recommended stands.
What should I do during a thunderstorm?
Do not touch the power cord or signal cable during a thunderstorm. This could cause electric shock.
Where can I find the full manual?
The full manual is available in PDF format on the notice-facile.com website. You can download it for free or request a translation by email.

User questions about 24U421A LG

1 question about this device. Answer the ones you know or ask your own.

Ask a new question about this device

Your email remains private: it is only used to notify you if someone answers your question.

Can the LG 24U421A monitor be tilted?
Frequently Asked Questions - 05/21/2026
Response Notice-Facile

Yes, the LG 24U421A monitor can be tilted. The adjustable stand offers a tilt angle ranging from -5° to 20°, allowing for front/back adjustment according to your needs to optimize your visual comfort.

To adjust the tilt:

  • Place the monitor on its stand in a vertical position
  • Hold the monitor by the sides (do not touch the screen)
  • Tilt the screen forward (up to 20°) or backward (up to -5°) according to your working position

Other stand adjustment capabilities:

  • Height adjustment of the base
  • Pivot or rotation function (see the stand instructions for specific details)

Important: Avoid touching the screen while adjusting the angle to prevent damaging the LCD panel. Do not force the adjustment mechanisms.

Respond (be the first)

Download the instructions for your Monitor in PDF format for free! Find your manual 24U421A - LG and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. 24U421A by LG.

USER MANUAL 24U421A LG

LG 24U421A - 1

PRECAUCIÓN

A: 100 mm

LG 24U421A - PRECAUCIÓN - 1

PRECAUCIÓN

LG 24U421A - PRECAUCIÓN - 1

NOTA

A: Botón joystick

Illustration of a hand holding a pen with a prohibition symbol (no text or labels)

Diagram showing a hand using a tool to cut a cylindrical object with a prohibition symbol indicated by a red circle.

Software compatible

This unit has been engineered and manufactured to ensure your personal safety, however improper use may result in potential electrical shock or fire hazards. In order to allow the proper operation of all safeguards incorporated in this display, observe the following basic rules for its installation, use, and servicing. All precautions and safety information apply to LCD and OLED models.

On Safety

Use only the power cord supplied with the unit. In case you use another power cord, make sure that it is certified by the applicable national standards if not being provided by the supplier. If the power cable is faulty in any way, please contact the manufacturer or the nearest authorized repair service provider for a replacement.

The appliance coupler is used as the 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.

Operate the display only from a power source indicated in the specifications of this manual or listed on the display. If you are not sure what type of power supply you have in your home, consult with your dealer.

Overloaded AC outlets and extension cords are dangerous. So are frayed power cords and broken plugs. They may result in a shock or fire hazard. Call your service technician for replacement.

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.

Do not Open the Display:

  • There are no user serviceable components inside.
  • There are Dangerous High Voltages inside, even when the power is OFF.
  • Contact your dealer if the display is not operating properly.

To Avoid Personal Injury :

  • Do not place the display on a sloping shelf unless properly secured.
  • Use only a stand recommended by the manufacturer.
  • Do not drop an object on or apply impact to the product. Do not throw any toys or objects on the product screen.
    It can cause injury to human, problem to product and damage the display.

To Prevent Fire or Hazards:

  • Always turn the display OFF if you leave the room for more than a short period of time. Never leave the display ON when leaving the house.
  • Keep children from dropping or pushing objects into the display's cabinet openings. Some internal parts carry hazardous voltages.
  • Do not add accessories that have not been designed for this display.
  • When the display is to be left unattended for an extended period of time, unplug it from the wall outlet.
  • 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.

On Installation

Do not allow anything to rest upon or roll over the power cord, and do not place the display where the power cord is subject to damage.

Do not use this display near water such as near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool.

Displays are provided with ventilation openings in the cabinet to allow the release of heat generated during operation. If these openings are blocked, built-up heat can cause failures which may result in a fire hazard.

Therefore, NEVER:

  • Block the bottom ventilation slots by placing the display on a bed, sofa, rug, etc.
  • Place the display in a built-in enclosure unless proper ventilation is provided.
  • Cover the openings with cloth or other material.
  • Place the display near or over a radiator or heat source.

Do not rub or strike the Active Matrix LCD with anything hard as this may scratch, mar, or damage the Active Matrix LCD permanently.

Do not press the LCD screen with your finger for a long time as this may cause some afterimages.

Some dot defects may appear as Red, Green or Blue spots on the screen.

However, this will have no impact or effect on the display performance.

If possible, use the recommended resolution to obtain the best image quality for your LCD display. If used under any mode except the recommended resolution, some scaled or processed images may appear on the screen. However, this is characteristic of the fixed-resolution LCD panel.

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 shock or scratch the front and sides of the screen with metallic objects.

Otherwise, it may cause damage to the screen.

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. Contact an authorized the service center for repair.

Avoid high temperatures and humidity.

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 disturbing reflections from surrounding light and bright surfaces.

Do not use products using high voltage around the Monitor. (ex. Electrical Swatter)

• Monitor may have malfunction as its electrical shock.

Precautions to the AC Adapter and Power

If water or any foreign substance goes inside the product (TV, monitor, power cord, or AC adapter), disconnect the power cord immediately and contact the service center.

- Otherwise, this may cause a fire or electric shock due to damage to the product.

Do not touch the power plug or AC adapter with wet hands. If the pins of the plug are wet or dusty, wipe and dry them before use.

- Otherwise, this may cause a fire or electric shock.

Make sure to completely insert the power cord into the AC adapter.

  • If loosely connected, the poor connection may cause a fire or electric shock.
    Be sure to use power cords and AC adapters provided or approved by LG Electronics, Inc.
  • The use of non-approved products may cause a fire or electric shock.

When unplugging the power cord, always pull it by the plug. Do not bend the power cord with excessive force.

  • The power line can be damaged, which may cause electric shock or fire.
    Be careful not to step or place heavy objects (electronic appliances, clothing, etc.) on the power cord or AC adapter. Be careful not to damage the power cord or AC adapter with sharp objects.

- Damaged power cords may cause a fire or electric shock.

Never disassemble, repair or modify the power cord or AC adapter.

• This may cause a fire or electric shock.

Be sure to keep the outlet, AC adapter, and pins of the power plug clean from dust and etc.

• This may cause a fire.

On Cleaning

  • Unplug the display before cleaning the face of the display screen.
  • Use a slightly damp (not wet) cloth. Do not use an aerosol directly on the display screen because over-spraying may cause electrical shock.
  • 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)
  • 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.

graph LR A["WATER"] --> B["Reinjection"] B --> C["Filter"] C --> D["Extraction"] D --> E["Chemical Detection"] E --> F["Output"]

On Repacking

- Do not throw away the carton and packing materials. They make an ideal container in which to transport the unit. When shipping the unit to another location, repack it in its original material.

MASA TË RËNDËSISHME PARAPRAKE

Ponovno pakiranje

- Materijal za pakiranje i kartonsku kutiju nemojte odbaciti. To je idealni spremnik za transport uređaja. Prilikom premještanja uređaja na drugu lokaciju ponovno ga zapakirajte u originalni materijal.

DŮLEŽITÁ UPOZORNĚNÍ

Balení

Ompakning

Volver a embalar

Қайта орау кезінде

Par iepakojumu

Opnieuw inpakken

Empacotamento

O raspakivanju

- Nemojte da bacite kartonsku kutiju i materijal za pakovanje. Oni su idealni za transportovanje proizvoda. Prilikom transporta proizvoda na drugu lokaciju, ponovo ga zapakujte pomoću originalnog materijala.

DÔLEŽITÉ BEZPEČNOSTNÉ OPATRENIA

MUHIM EHTIYOT CHORALARI

Shaxsiy shikastlanishlarning oldini olish:

  • To'g'ri mahkamlanmagan bo'lsa, displeyni qiya tokchalarga o'rnatmang.
  • Faqat ishlab chiqaruvchi tomonidan tavsiya qilingan tayanchlardan foydalaning.
  • Mahsulot ustiga buyumlarni tashlamang yoki uni hech qanday ta'sir ostiga qo'ymang. Mahsulot ekraniga o'yinchoqlar yoki boshqa buyumlarni otmang. Bu odamlarning jarohatlanishi, mahsulot bilan bog'liq muammolar va displeyning shikastlanishiga olib kelishi mumkin.

Empacotamento

정격 전압에서 사용하세요.

물이 들어가거나 젖게하지 마세 요.

DDC is a communication channel over which the monitor automatically informs the host system (PC) about its capabilities.

DDC protocol

① DDC1/DDC2B
An uni-directional communication channel.
② DDC 2AB/DDC2B+/DDC2Bi
A bi-directional communication channel.

Note

- PC must support DDC functions to do this.

E-DDC (Enhanced DDC)

A protocol based on I²C and used on a bidirectional data channel between the display and host. This protocol accesses devices at I²C address of A0/A1 as well as the address 60. The 60 address is used as a segment register to allow larger amounts of data to be retrieved than is possible using DDC2B protocols. The protocol is compatible with DDC2B protocols.

DEUTSCH

DDC (Display Data Channel)

② DDC 2AB/DDC2B+/DDC2Bi

② DDC 2AB/DDC2B+/DDC2Bi

② DDC 2AB/DDC2B+/DDC2Bi

② DDC 2AB/DDC2B+/DDC2Bi

② DDC 2AB/DDC2B+/DDC2Bi

양방향 통신 채널.

② DDC 2AB/DDC2B+/DDC2Bi

双方向通信チャンネル。

② DDC 2AB/DDC2B+/DDC2Bi

Energy Saving Design

This program is designed to have computer equipment manufacturers build circuitry into their products to reduce power consumption when it is not in operation.

When this monitor is used with a PC on which a screen blanking software complying with the VESA Display Power Management Signalling (DPMS) Protocol is installed, it can conserve significant energy by reducing power consumption when it is not in operation.

There are 2 signal lines, 3 modes of operation.

: On Mode, Sleep Mode, Off Mode.

Mode Definition
On modeThe normal operation.When the monitor is on mode, being connected to a power source, it displays an image.
Sleep ModeThe reduced power state returns to on mode when the user moves the mouse or presses a key on the keyboard.
Off ModeThe lowest power consumption state returns to on mode when the user pushes a power switch.

Note

- The energy saving Design monitors only work while connected to the computers that have energy saving features.

Programa de economia de energia

Mode activé (On), mode de veille (Sleep), mode désactivé (Off).

Unplug the monitor from the wall outlet and refer servicing to qualified service personnel when :

  • The power cord or plug is damaged or frayed.
    • Liquid has been spilled into the monitor.
  • The monitor has been exposed to rain or water.
  • The monitor does not operate normally following the operating instructions. Adjust only those controls that are covered in the operating instructions. An improper adjustment of other controls may result in damage and often requires extensive work by a qualified technician to restore the monitor to normal operation.
  • The monitor has been dropped or the cabinet has been damaged.
  • The monitor exhibits a distinct change in performance.
  • Snapping or popping from the monitor is continuous or frequent while the monitor is operating. It is normal for some monitors to make occasional sounds when being turned on or off, or when changing video modes.

Do not attempt to service the monitor yourself, as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel.

DEUTSCH

Wartun

Manual assistant
Powered by Anthropic
Waiting for your message
Product information

Brand : LG

Model : 24U421A

Category : Monitor