LG 55UM3DF (Discontinued) · Replacements in Qatar

Name: LG 55UM3DF 55-inch UHD Digital Signage Display, 350 nits
Brand: LG
SKU: lg-55um3df
Availability: Discontinued

Overview

The LG 55UM3DF is a 55-inch UHD signage display with an IPS panel, 350 nit typical brightness and IP5x dust protection. The manufacturer has discontinued this model, so buyers who already run it or compare it with newer units should request a quote for a current equivalent. Its narrow bezel, portrait and landscape orientation and built-in speakers suit indoor lobbies, corridors and meeting areas in Doha.

A 55-inch UHD display for indoor signage

The LG 55UM3DF is a 55-inch signage display from the UM3D series, built for indoor sites where content must stay sharp and readable through a full working day. Its IPS panel has a native resolution of 3,840 x 2,160, four times the pixel count of Full HD, so fine text on menus, timetables and floor plans stays legible at close range. The manufacturer has discontinued this model. This page is written for organisations that already own it, buyers comparing it with newer displays, and anyone who needs a current equivalent.

Panel and mounting facts that matter on site

Brightness and contrast: 350 cd/m² typical with a 1,100:1 contrast ratio.
Viewing angle: 178 degrees horizontal and vertical, so people standing beside the screen still see the content clearly.
Response time: 8 ms grey to grey.
Surface: a 3% haze treatment on the panel face.
Orientation: portrait or landscape, detected automatically at first start-up.
Tilt: up to 30 degrees for high mounting, rated at 30°C and 50% humidity.

A built-in horizontal sensor helps installers level the panel precisely. Typical panel life is listed at 50,000 hours.

Connectivity, control and built-in playback

Inputs include three HDMI ports, DisplayPort, DVI-D, audio and USB 2.0, with DisplayPort and audio outputs. Control runs through RS232C in and out, an RJ45 LAN port and an IR input. The quad-core processor and webOS platform can play content without a separate media player, and the unit is listed as OPS compatible for OPS-based systems. The display can send email alerts when a fault occurs, such as the panel being knocked out of level by an impact. It is listed as compatible with SuperSign CMS, SuperSign Control and Control+ and Signage365Care, and carries certified compatibility with Crestron Connected and Cisco video conferencing systems.

Where it fits in Qatar

A private school in Al Wakrah refitting corridors, with the display in portrait orientation beside classroom doors to show timetables and announcements.
A clinic waiting area in Msheireb showing queue numbers and health information, where the 9.9 mm side bezels keep the wall tidy.
A hotel lobby in West Bay with built-in speakers, so a quiet welcome loop needs no external audio hardware.

Qatar summers push outdoor temperatures well above 40°C, and the operating range is 0 to 40°C with 10 to 80% humidity. Keep the display in an air-conditioned indoor space and confirm the room temperature, and any sun falling on the screen through windows, with the SmartRooms Qatar team before installation.

What to plan before ordering

The head unit weighs 19.0 kg and the packed weight is 24.2 kg. The VESA pattern is 300 x 300, and the overall size is 1,234.4 mm x 720.9 mm x 39.9 mm. The optional wall bracket LSW350B, stand ST-653T and VESA adapter AM-B330S are listed by the manufacturer. Power draw is 95 W typical and 140 W maximum on a built-in supply rated 100-240 V, 50/60 Hz, which includes Qatar's 240 V, 50 Hz mains. Our free site survey checks wall structure, viewing distance and cable routes. Schools, ministries and hospitals ordering several units can request quotations against an LPO or tender reference. Request a quote and the SmartRooms Qatar team will confirm a current equivalent or compatible replacement.

Highlights

55-inch IPS panel with 3,840 x 2,160 UHD resolution
350 cd/m² typical brightness and 1,100:1 contrast ratio
Portrait and landscape orientation with automatic detection
IP5x dust protection and up to 30 degree tilt
OPS compatible, with webOS built-in content playback
Built-in power supply rated 100-240 V, 50/60 Hz

Estimated timeline

Quotation within 1 working day · delivery timing depends on stock availability, and we confirm it with your quotation.

Specifications

40 specifications · Source: manufacturer · checked Oct 2026

PANEL12

Screen Size: 55"
Panel Technology: IPS
Aspect Ratio: 16 : 9
Native Resolution: 3,840 x 2,160 (UHD, RGB)
Brightness(Typ.,cd/m²): 350
Contrast Ratio: 1,100:1
Viewing Angle (H x V): 178 x 178
Response Time: 8ms (G to G)
Surface Treatment (Haze): Haze 3%
Life Time (Typ.): 50,000 Hrs
Operation Hours: 18 Hrs
Orientation: Portrait & Landscape

CONNECTIVITY3

Input: HDMI (3), DP, DVI-D, Audio, USB 2.0
Output: DP, Audio (Off/Fixed/Variable)
External Control: RS232C In/out, RJ45 (LAN) In, IR In

MECHANICAL SPECIFICATION8

Bezel Color: Black
Bezel Width: 9.9mm(T/R/L), 14.4mm(B)
Monitor Dimension (W × H × D): 1,234.4mm x 720.9mm x 39.9mm
Weight (Head): 19.0 kg
Carton Dimensions (W × H × D): 1,360mm x 835mm x 175mm
Packed Weight: 24.2 kg
Handle: No
VESA™ Standard Mount Interface: 300 x 300

SPECIAL FEATURE2

Tilt (Facedown): Max. 30º *In conditions within 30ºC temperature, 50% humidity
IP Rating: IP5x

ENVIRONMENT CONDITIONS2

Operation Temperature: 0°C to 40°C
Operation Humidity: 10 % to 80 %

POWER2

Power Supply: 100-240V~, 50/60Hz
Power Type: Built-In Power

POWER CONSUMPTION2

Typ. / Max.: 95W / 140W
Smart Energy Saving: 70W

CERTIFICATION3

Safety: CB / NRTL
EMC: FCC Class "A" / CE / KC
ErP / Energy Star: Yes (EU Only) / Yes (Energy Star 8.0)

MEDIA PLAYER COMPATIBILITY1

OPS Type Compatible: Yes

SOFTWARE COMPATIBILITY3

Content Management Software: SuperSign CMS
Control and Monitoring Software: SuperSign Control/Control+
Signage365Care: Yes

ACCESSORY2

Basic: Remote Controller, Power Cord, QSG, Regulation Book, Phone to RS232C Gender
Optional: Stand(ST-653T), Media Player, Wall Bracket(LSW350B), VESA Adapter(AM-B330S), OPS Kit (KT-OPSF)

Downloads

6 files from the manufacturer

PDF Manuals & guides · Opens on manufacturer site MFL71435702_05_240513.pdf 4.5 MB PDF Manuals & guides · Opens on manufacturer site OM_ARA.pdf 3.7 MB PDF Manuals & guides · Opens on manufacturer site OM_ENG.pdf 3.3 MB URL Manuals & guides · Opens on manufacturer site User Guide PDF Manuals & guides · Opens on manufacturer site webOS4.1_ENG.pdf 6.8 MB URL Software & firmware · Opens on manufacturer site Software & Drivers (support page)

Questions about 55UM3DF

Is the LG 55UM3DF still sold new by the manufacturer?

No. LG has discontinued the 55UM3DF, so SmartRooms Qatar quotes a current equivalent or a compatible replacement instead. When you request a quote, share your existing wall mounts, power arrangement and content setup so the team can check which options fit your site.

Is the 55UM3DF suitable for a school corridor in Al Wakrah?

A corridor suits this 55-inch display well, since it can run in portrait orientation beside doors for timetables and announcements. The panel detects its orientation automatically at first start-up. Confirm the mounting height and the room temperature with our team, because the operating range is 0 to 40°C.

What resolution and viewing angle does the panel offer?

The panel has a native resolution of 3,840 x 2,160 and a 178 x 178 degree viewing angle. It also has a 1,100:1 contrast ratio and an 8 ms grey-to-grey response time. These figures help content stay clear for people standing to the side of the screen in a lobby or reception area.

Will 350 nits work in a glass-fronted lobby in West Bay?

The panel has a typical brightness of 350 cd/m², which suits indoor spaces with controlled lighting. The source data does not establish performance in direct sunlight. For a glass-fronted lobby or a room with windows facing the afternoon sun, have the SmartRooms Qatar team review the position and lighting before you order.

Can a clinic in Msheireb use it vertically for queue information?

Yes. The display supports portrait and landscape and detects its orientation automatically during first setup, so a vertical queue screen needs no manual rotation. The 9.9 mm side and top bezels keep the picture area large. Request a quote and our team can advise on wall height and cable routing for your waiting area.

Do I need a separate media player for a multi-screen rollout?

Not necessarily. The quad-core processor and webOS platform can play content without a separate player. The unit is listed as OPS compatible, and the OPS Kit KT-OPSF and a media player are optional accessories. Describe your content workload and number of screens when you request a quote so the right setup is recommended.

Which inputs and control ports does it have?

Inputs are three HDMI ports, DisplayPort, DVI-D, audio and USB 2.0, with DisplayPort and audio outputs. Control options are RS232C in and out, an RJ45 LAN port and an IR input. These ports let a building management system or a central controller manage several displays from one room or floor.

Can it be wall mounted, and what should I plan for?

It uses a 300 x 300 VESA mount pattern and weighs 19.0 kg without packaging, or 24.2 kg packed. The optional wall bracket LSW350B and VESA adapter AM-B330S are listed options. Because wall structures vary, SmartRooms Qatar offers a free site survey before installation to confirm the fixing method.

Does the power supply suit Qatar's 240 V mains?

The built-in power supply is rated 100-240 V, 50/60 Hz, so Qatar's 240 V, 50 Hz supply falls within the stated range. Power draw is 95 W typical and 140 W maximum, and the energy-saving figure is listed at 70 W. Ask our team to confirm the supplied power cord suits the BS 1363 sockets in your building.

Can it handle Qatar's heat and dust in a loading bay or warehouse?

No. The operating temperature is 0 to 40°C with 10 to 80% humidity, and the dust rating is IP5x. A loading bay in the Industrial Area or a warehouse without air conditioning is outside the intended environment. Request a quote and describe the space so the team can recommend a suitable display.

Which certifications does it carry?

The data lists CB and NRTL safety certification, FCC Class A, CE and KC for EMC, ErP for EU only, and Energy Star 8.0. Government and education buyers should check these marks against their tender or LPO documentation. Request a quote and the SmartRooms Qatar team will answer your compliance questions before you order.

Can a hospital in Doha monitor screens remotely across several floors?

The display can send email notifications when a problem occurs, such as the panel being tilted by an external impact. It is listed as compatible with SuperSign CMS, SuperSign Control and Control+ and Signage365Care. Ask SmartRooms Qatar to confirm your existing content management setup when requesting a quote.