Why do LED displays appear red?

Committed to be The best LED screen suppliers!

TUV Vice President member Qianhai Equity Exchange Center Stock No.:668192
news
  • Home
  • News
  • Industry news
  • Why do LED displays appear red?

    • Why do LED displays appear red?

    24 views admin 2025-08-08

    • Red lines (or red bars or blocks) on LED displays are usually caused by hardware failure or signal transmission issues. The following are the most common causes, listed in descending order of likelihood:
    • 1. Damage to a single or localized LED bead/chip:
     
    • This is the most common cause. LED displays are composed of countless red (R), green (G), and blue (B) LEDs. If the LED chip responsible for displaying red light is damaged or malfunctions (such as a short circuit), it may appear solid red or display red erratically.
     
    • 2. Problems with the internal wiring/connectors of the LED module:
     
    • The wiring connecting the RGB LEDs within the LED module may be loose, have poor contact, suffer from poor soldering, oxidize, be physically damaged (such as being crushed or chewed by a rat), or have a damaged connector.
     
    • 3. Problems with the wiring/connectors between modules:
     
    • The wiring connecting different LED modules (or unit boards) may be loose, have poor contact, suffer from poor soldering, oxidize, be physically damaged, or have a damaged connector (such as the one on the hub board). In particular, problems may be with the data line that transmits the red signal.
     
    • The driver chip responsible for controlling the on/off and brightness of the LEDs is damaged. If a driver IC (especially the one controlling the red channel) fails, the row or column of LEDs it controls may display abnormally, such as being permanently red.
    • 5. Power Supply Issue:
     
    • Unstable/Low Voltage: Low or unstable power supply voltage to a specific module or area may cause abnormal display in that area, sometimes predominantly in the red color (different LED colors have slightly different voltage characteristics).
     
    • Power Module Failure: The output of a switching power module is abnormal.
     
    • Loose/Damaged Power Cord: The power cord connecting the module is loose or damaged.
     
    • 6. Receiving Card/HUB Board Issue:
     
    • The receiving card, which receives signals from the sending card and distributes them to the module, or the hub board connecting the receiving card and module may be faulty (e.g., a damaged port, poor solder joint, or damaged component).
     
    • 7. Sending Card/Control System Issues:
     
    • While this is relatively rare, a sending card malfunction, control software bug, incorrect graphics card settings (such as incorrect output color space), or transmission cable (e.g., network cable) issues can also cause signal errors, resulting in the screen displaying an unexpected red tint.
     
    • 8. Physical Damage or Environmental Factors:
     
    • The screen has been subjected to external impact, pressure, moisture/liquid intrusion (causing short circuits or corrosion), prolonged high temperatures (accelerating component aging), static electricity, insect damage, etc.
     
    • How to Initially Identify and Troubleshoot
     
    • 1. Observe the Symptom:
     
    • Is the location fixed? (Yes: hardware issue is likely; No: signal/power/software issue is likely.)
     
    • Is it a single point, a small area, an entire row, a column, or a large area?
     
    • Is the red line solid, flickering, or changes with the screen?
     
    • Does the problem persist after restarting the display and control system?
     
    • 2. Simple Inspection:
     
    • Restart: Shut down the entire display system (including the sending card computer), wait a few minutes, and then restart it. Sometimes software or temporary errors can be resolved.
     
    • Check the connections: Focus on checking, after powering off, the cables between modules in the area with the red line, and between the module and the hub/receiving card. Check for any obvious physical damage (bends, breaks), and check for oxidation or dirt on the gold fingers (gently wipe with an eraser). Check that the power cable is securely connected.
     
    • Swap the cables: If you suspect a problem with the cables between modules, try replacing the cable in the suspected faulty area with a known good cable.
     
    • Swap the modules: If you suspect a problem with a module (the LEDs or internal cables), try swapping it with a functioning adjacent module of the same model. If the red line follows the module, it's almost certain the module is faulty. If the red line remains in its original position, the problem may be with the cables, hub, or receiving card.
     
    • Observe the power indicator: Check that the power indicator on the corresponding area is normal (usually green).
     
    • 3. Seek professional repair:
     
    • Problems like damaged lamps, driver ICs, internal module cables, receiving cards/hub boards, and power modules generally require inspection and replacement by professional LED display repair personnel.
     
    • Non-professionals should avoid soldering or disassembling delicate components to avoid further damage.
     
    • Summary:
     
    • Red lines on LED displays are often caused by physical connection issues (loose, poorly connected, or damaged cables) or localized hardware damage (individual lamps, driver ICs, or modules). Initial diagnosis should be made by inspecting the cables and observing the characteristics of the abnormal area. If you are unable to resolve the issue yourself, contacting the display manufacturer or a professional repair technician is the safest option.
       
    P8 19200mm width*3840mm height curve shape led display in Saudi Arabic

    P8 19200mm width*3840mm height curve shape led display in Saudi Arabic

    Do you like ?1,328 views

    Read more
    Technology | analysis of naked eye 3D display technology

    Technology | analysis of naked eye 3D display technology

    At present, the naked eye 3D large screen market is hot, and 3D technology is also known as 3D di...

    Do you like ?2,174 views

    Read more
    Sunrise’s p2.604 curved LED display lights up under the Eiffel Tower

    Sunrise’s p2.604 curved LED display lights up under the Eiffel Tower

    Sunrise’s p2.604 curved LED display lights up under the Eiffel Tower     Sunri...

    Do you like ?1,340 views

    Read more
    Sunrise LED Rocky Rental Series led display for concert

    Sunrise LED Rocky Rental Series led display for concert

    Concert activities are popular in the United States, and sunrise’s products have been wide...

    Do you like ?1,858 views

    Read more
    Sunrise 264 square meters Galaxy 3115 series mesh led facade in Armenia

    Sunrise 264 square meters Galaxy 3115 series mesh led facade in Armenia

      Sunrise 264 square meters Galaxy 3115 series mesh led facade in Armenia     Sun...

    Do you like ?1,361 views

    Read more
    Sunrise led presents awards to excellent salesmen!

    Sunrise led presents awards to excellent salesmen!

    Doris, as a new salesman, won three orders in two months. It’s great.   Jack, the bu...

    Do you like ?1,197 views

    Read more
    Our new product, led grow light, PPE reaches 2.6umol/j

    Our new product, led grow light, PPE reaches 2.6umol/j

    640w and 800W full spectrum led grow light   It can be folded for convenient transportatio...

    Do you like ?1,374 views

    Read more
    The latest project, Saudi Arabia LED MESH FACADE

    The latest project, Saudi Arabia LED MESH FACADE

    The latest project, Saudi Arabia LED MESH FACADE. Ultra-high brightness, ultra-light LED display ...

    Do you like ?1,787 views

    Read more

    Search

    Hot Product

    contact us

    pic

    TEL:
    +86-755 28492699
    +86-755 28492348
    +86 13632675800

    E-mail:
    [email protected]

    ADD:
    9-1 Building,Gongxiaoshe Industrial Zone, Pinghu Town, Longgang District, Shenzhen,China,518111

    Technical Support: Magic Lamp