As an advanced display device, indoor LED display screens are widely used in commercial advertisements, entertainment venues, conference halls, stadiums and other scenarios.
However, just like any electronic device, LED display screens may encounter various problems during long-term use, such as pixel failure, uneven display, dead light, signal interference, etc.
These problems will not only affect the display effect, but also shorten the service life of the equipment and even cause safety hazards.
Therefore, regular maintenance and care are the key to ensure the long-term stable operation of the LED display screen, extend the service life and ensure the display effect.
If you have an indoor LED display screen that needs maintenance, carefully reading this indoor LED display screen maintenance guide can help you find the problem and solve the problem that confuses you.
 Necessary preparations before repairing indoor LED display screens
Before repairing the display screen, first ensure safety, disconnect the power supply and unplug the plug to avoid electric shock or short circuit.
Next, prepare the necessary tools and materials, including basic tools such as multimeter, screwdriver, electric soldering iron, solder wire, insulating tape, and spare materials such as modules, receiving cards, flat cables and power cords.
Finally, be familiar with the internal structure of the display screen, and understand the layout of the power supply, control card, module, receiving card and cables to quickly locate and solve the problem.
Common troubleshooting and solutions for indoor LED display screens
The indoor LED display screen is completely dark
Possible reasons: power failure, damaged control card, loose power cord.
Solution steps:
â‘ Use a multimeter to check whether the power output voltage is normal. If abnormal, replace the power supply.
â‘¡ Check the control card indicator light. Through our naked eyes, we can observe the green signal indicator light and the red signal indicator light on the receiving card of the LED display screen.
As long as one of the indicators is not on, it means that the LED receiving card is broken and needs to be replaced in time.
â‘¢ It is necessary to check the main power cord of the LED display screen and the signal cord of the LED display system.
If the main power cord is not installed properly or the signal cord is loose, the indoor LED display screen will not light up at all.
2. Partial area is not bright/flickering
Possible reasons: indoor LED module is damaged, cable is loose, driver IC is faulty, receiving card is abnormal.
Solution steps:
â‘ Check the signal cable and interface of the indoor LED module in the abnormal area.
Sometimes the signal cable is bitten off by mice or the LED module interface is rusted due to the humid environment. At this time, you need to re-plug or replace the cable.
â‘¡ If the cable is normal, replace a good LED module for testing, and check whether the 5V power line interface of the LED module is good or whether the 5V power line of the LED module is good.
If the LED module in the test displays normally, it means that the cable and power line are good.
â‘¢ If the problem persists, check the driver IC or receiving card (if the entire area is distorted, replace the receiving card first).
distorted screen/flickering/displayed messy
Possible reasons: loose signal line, abnormal control card, unstable power supply voltage.
Solution steps:
â‘ Re-plug the signal line and replace the damaged cable.
â‘¡ Restart or replace the control card.
â‘¢ Use a multimeter to detect the power supply voltage. If the fluctuation is too large, the power supply needs to be replaced.
Uneven brightness/dead light phenomenon
Possible reasons: module aging, unstable voltage, single lamp bead damage.
Solution steps:
â‘ If the indoor LED module cannot display normal images due to long-term aging, it needs to be replaced with a spare LED module.
â‘¡Check the stability of the LED display power supply, replace the power supply if necessary, and use a multimeter to measure whether the output voltage of the power supply is 4.2V to 5V.
If it is lower than 4.2V, it proves that the power supply of this LED display is bad.
â‘¢If the indoor LED module has unlit LED lamp beads, it is necessary to remove the indoor LED module and replace the unlit LED lamp beads on the maintenance table.
Power-on tripping/short circuit
Possible reasons: line short circuit, metal foreign matter falling, connector touching.
Solution steps:
â‘ Focus on checking whether the positive and negative poles of the power connector are in contact.
â‘¡Clean up foreign matter inside the screen to ensure that there is no metal residue.
Golden rules for daily maintenance of indoor LED display screens
When using indoor LED display screens on a daily basis, there are several key maintenance points to pay attention to: First, clean the surface and interior of the device regularly.
It is recommended to wipe the surface with a dry soft cloth and avoid using chemical cleaners. Clean the dust on the circuit board after power failure to ensure smooth heat dissipation
Second, check the power cord, signal cable and flat cable of the device every month to ensure that the connection is stable and undamaged.
In addition, the environment where the device is located should be kept dry and ventilated, the temperature should be controlled between 10℃ and 30℃, and the humidity should not exceed 70% to avoid condensation of water mist.
In terms of software, the control card firmware should be updated regularly to improve system stability, and remember to back up important display data to a reliable storage device;
Finally, if the device has been used for more than three years, it is recommended to gradually replace the aging display module and power supply to extend the service life of the device.
These maintenance measures can effectively ensure the stable operation and service life of the equipment.
 Maintenance precautions
Ensure safe operation
â—‹ Before performing any maintenance operation, be sure to cut off the power supply and wear an anti-static wristband to avoid static electricity from damaging sensitive components and ensure safe operation.
Do what you can and handle complex problems professionally
â—‹ When encountering complex faults (such as chip-level damage, etc.), you should first perform detailed inspections and analysis. If it is beyond your ability, please contact professional maintenance personnel in time to avoid further expansion of the problem.
Establish a complete maintenance file
â—‹ Keep a detailed record of each maintenance operation, including information such as the fault phenomenon, diagnosis process, replacement parts and maintenance results, and establish a regularly updated maintenance file for subsequent reference and analysis.
V. Practical Case Quick Reference Table
Here I have compiled the corresponding indoor LED display maintenance solutions based on common problem phenomena.
Problems of indoor LED display screen
Quick judgment
Indoor LED display screen maintenance solution
The whole screen is black
Power supply/control card failure
Detect power supply voltage → replace control card
Partial flashing of mixed colors
Loose cable or damaged receiving card
Re-insert cable → replace receiving card
Continuous lamp bead abnormality
Module failure
Direct replacement of magnetic suction board
Screen tripping
Line short circuit
Check power connector → clean up internal foreign objects
Regarding the use and maintenance of indoor LED display screens, we recommend that you pay attention to the following points:
In daily use, please try to avoid letting the screen run at full brightness for a long time, which will help extend the service life of the lamp beads
At the same time, please pay close attention to the manufacturer’s firmware update notification and upgrade in time to optimize display performance and improve operation stability.
If you encounter problems, it is recommended to first conduct a simple self-check, which can not only save time, but also improve problem solving efficiency.
As a professional LED display screen manufacturer and maintenance service provider, LEGIDATECH is willing to provide you with professional technical support.
If you have any experience or confusion during use, and this indoor LED display screen maintenance guide cannot solve your problem, please feel free to share your experience and experience with us.
