Maintenance Guide for LDS LED Display Screen and Conference Machine

Liandesen LED display screen and conference all-in-one machine universal use and maintenance guide

To ensure that the Liandesen LED display product you are using can operate stably for a long time, extend its service life, and always maintain the best display effect, please follow the following general maintenance recommendations. This guide is applicable to various LED display screens and LED conference all-in-one products under the Liandesen brand. Please refer to the "Product Manual" of your purchased model for specific operations. If you have any questions, please contact our customer service team.

Part One: Daily Use and Operating Standards

1. Startup and shutdown sequence

The correct power on/off sequence is the key to protecting the circuit of display equipment. When starting up, please first turn on the video source device (such as a computer or player), wait for it to start up normally, and then turn on the display screen or all-in-one power. When shutting down, the order is reversed: first turn off the display screen or all-in-one power, and then turn off the video source device. This can prevent momentary current surges from causing damage to the screen.

2. Operating environment requirements

The equipment should operate under the specified environmental conditions. Indoor products should be avoided from being installed near heat sources, steam, oil fumes, or flammable and explosive gases. Outdoor screens need to ensure that their protection level (such as IP65) matches the installation environment. The common requirements include:

Temperature and humidity: Use within the temperature and humidity range specified in the manual, usually from -10 ℃ to 50 ℃ (outdoor screens have a wider range), with relative humidity below 90% and no condensation. Avoid sudden movement of equipment from a cold environment to a warm environment, which may cause internal condensation. If it is necessary to move, it should be left to stand for several hours before being powered on.

Clean environment: Keep the usage environment clean and reduce the accumulation of dust and metal debris. Excessive dust can affect heat dissipation and circuit safety.

Ventilation and heat dissipation: Adequate heat dissipation space should be left around the equipment, especially near the ventilation openings (recommended to be greater than 10 centimeters), and covering or blocking is strictly prohibited. Good heat dissipation is the foundation for preventing components from aging too quickly.

3. Suggested runtime

Although our product design supports long-term continuous operation, it is recommended to turn it off or set it to sleep mode during non use periods (such as nighttime) to extend its overall lifespan. For outdoor screens with high brightness operation, reasonable intermittent operation can help reduce light attenuation.

4. Precautions for screen display

Avoid displaying static ultra-high brightness images (such as pure white logos or static logos) on the screen for a long time, as this may cause premature aging of local pixels, resulting in "ghosting" or "burn-in" phenomena. Suggest enabling screensaver or dynamic content slideshow function.

It is recommended to adjust the screen brightness to a comfortable level that is suitable for the ambient light. Excessive brightness not only consumes power, but also accelerates the fading of the light.

Part 2: Cleaning and Maintenance Methods

Regular and proper cleaning can maintain screen clarity and prevent stains from corroding the surface.

1. Cleaning cycle

It is recommended to perform regular cleaning every 1-3 months based on the amount of dust in the usage environment. In environments with high levels of dust and oil fumes, it is necessary to increase the frequency of cleaning.

2. Cleaning tools and materials

Soft bristle brush/vacuum cleaner: used for preliminary cleaning of floating dust on the surface of the screen and in the gaps between splices.

Soft velvet free fabric: such as lens cloth, ultra-fine fiber cloth. Do not use tissues, towels, or hard fabrics.

Special cleaning agent: It is recommended to use electronic device screen specific cleaning agent. It is strictly prohibited to use chemical reagents with strong corrosiveness or solubility, such as alcohol, ammonia water, acetone, and ethyl acetate (such as ordinary glass cleaners and gasoline).

3. Cleaning steps (taking the LED conference all-in-one touch screen as an example, the display screen is similar)

Step 1: Power off. Be sure to turn off the device power and unplug the power plug, and wait for the screen to completely cool down.

Step 2: Dust removal. Use a soft bristled brush to gently sweep away particles and dust from the edges and screen surface, or use the soft bristled suction head of a low-power vacuum cleaner to vacuum from a distance.

Step 3: Wet wipe. Spray a small amount of specialized cleaning agent onto a soft cloth, do not spray directly onto the screen. Gently wipe the screen surface and body in the same direction (clockwise or counterclockwise) with a slightly damp soft cloth.

Step 4: Dry wipe. Immediately use another dry, soft, and lint free cloth to wipe off any remaining liquid and marks, ensuring that the screen is dry and free of water stains.

Special reminder: When cleaning outdoor screens, pay attention to checking whether the waterproof rubber ring on the surface of the module is aging or damaged. Avoid strong flushing to directly impact the splicing gap during cleaning. When cleaning the touch screen, the action should be gentle and avoid heavy pressure.

Part Three: Preliminary Self Inspection of Common Malfunctions

When there is an abnormality in the device, the following basic checks can be performed first, and many problems can be solved by themselves.

1. The entire screen does not light up (no power supply)

Check if the main power switch is turned on and if the power cord is securely plugged in.

Check if the air switch in the distribution cabinet or power strip has tripped, and if the power strip is working properly.

Confirm that the input voltage is within the required range of the device.

2. There is power but the screen is not displaying (black screen)

Check if the video source device (such as a computer) is properly turned on and outputting signals.

Check whether the two ends of the connecting cables (such as HDMI, DP, DVI cables) are securely plugged in and whether the cables themselves are damaged. Try replacing a known good cable.

Confirm if the input source selection of the device matches the port you are connected to.

3. Local dimming, screen flickering or flashing

Preliminary check if the power and signal wires in the corresponding area are loose, and re plug and tighten them.

Check if the video source resolution and refresh rate are set within the optimal range supported by the device.

For splicing screens, check the connection wires of individual modules or receiving cards. This operation involves internal structure. If inexperienced, it is recommended to stop and contact customer service.

4. Touch function failure (for conference all-in-one machines)

Confirm that the touch box power supply is connected and turned on (if there is an independent power supply).

Check if the USB touch cable is securely connected to the computer host.

Check if the touch device driver is working properly in the computer device manager and try recalibrating the touch screen.

Ensure that the screen surface is clean and free from water droplets or excessive stains that may affect infrared sensing.

Part 4: Long term disuse and storage

If the device needs to be out of service for a long time (more than one month):

Shut down in the correct order and unplug all power cords.

Pack the equipment and store it in a dry, ventilated, and non corrosive indoor environment.

The recommended storage environment temperature and humidity should be consistent with the operating environment requirements to avoid extreme conditions.

Regular power on maintenance: It is recommended to power on and run for at least 2 hours every 2-3 months to eliminate moisture and maintain the activity of electronic components.

Important Safety Reminders and Disclaimer

Non professionals are not allowed to disassemble: There are high-voltage components inside the equipment. Opening the chassis without authorization may cause electric shock or permanent damage, and may also render warranty services invalid.

Immediately turn off the power when encountering water or foreign objects: If the equipment is flooded or any liquid enters, or if foreign objects fall into the heat dissipation hole, please immediately turn off the power and unplug the plug, and contact professional personnel for handling.

Thunderstorm weather protection: For outdoor screens or systems without complete lightning protection measures, it is recommended to cut off the main power supply of the equipment in strong thunderstorm weather to ensure safety.

This guide is a general recommendation and cannot cover all specific situations. Please refer to the official user manual of the specific product model you purchased for the final operation and maintenance standards. Liandesen Company will not be responsible for warranty liability for equipment damage caused by failure to follow the instructions or improper maintenance.