Ten major failures and troubleshooting of LED display



一、Screen doesn't work and green light flashing on sending card.

1. failure causes

1) no power supply to screen

2) bad connection with internet cable

3) no power supply to receiving card

4) bad sending card

5) Signal transmission devices failure

2. failure solutions

1) check power supply

2)Check and reconnect internet cable

3) Make sure DC voltage is between 5v and 5.2v.

4) Switch sending card

5) Check connection or switch functional card


二、Screen doesn't work and green

1.failure causes

1) inappropriate connection with DVI or HDMI

2) graphics card is not set up to copy model

3) screen is switched off in the software

4) sending card plugs inappropriately or bad sending card

2. failure solutions

1) check DVI plug

2) reset copy model

3) switch on screen in software

4) plug in again or switch sending card


三、 showing “system no found” when screen launching

1.failure causes

1)connecting issue with sending card

2)bad computer com or USB plug

3)bad cable

4)bad sending card

5)didn’t install USB drive

2.failure solutions

1) confirm connection

2) switch computer

3) switch cable

4) switch sending card

5) install USB drive


四、partially not display or miss colors in rows

1. failure causes

1) bad connection with flat cable or DVI

2) signal input or output problem

2. failure solutions

1) plug in again or switch cables

2) locate bad modules and switch them


五、modules partially do not display

1. failure causes

1) power protection or damaged power

2) bad connection with AC power cable

2. failure solution

1) check power supply

2) plug in power cable again


六、whole panel does not display

1. failure causes

1) 220v power cable doesn’t connect well

2) Bad internet connection

3) Broken receiving card

4) HUB plugs in wrong position

2. Failure solution

1) Check power cable

2) Check internet cable

3) Switch receiving card

4) Hub plugs in again


七、blurred screen

1. Failure cause

1) Wrong program was loaded

2) Low quality internet cable

3) Broken sending card

2. Failure solution

1) Reload correct program

2) Switch internet cable

3) Switch sending card


八、Each display unit displays the same content

1. Failure cause

Didn’t send document to connect each cabinet

2. Failure solution

send connection document


九、Low brightness, blurry picture on the screen

1.Failure cause

1) Program error with sending card

2) Incorrect setting on functional card

2. Failure solution

1) Reset sending card setting to default

2) Set minimum brightness to 80


十、picture shaking or double image

1. Failure cause

1) Check connection cable between computer and screen.

2) Check DVI cable with multimedia card and sending card

3) Broken sending card

2. Failure solution

1) Plug in again or switch cable

2) Fix DVI cable

3) Switch sending card




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