What to do when an led display is black screen

In practical application, LED display screen will inevitably encounter various faults, especially when the LED display screen brokes, which makes the user crazy. Following we will know 2 embarrassing examples of LED blank screen：

 

1. Opening ceremony of the Winter Olympics in Sochi--Black Screen Crash

In 2014 Russia Sochi Olympics opening ceremony, when the audience entered the countdown, the countdown LED sign suddenly became black. In addition, the Olympic Rings also showed wrong on the big screen, leading to 5 rings only showed 4, which caused the sponsors very embarrassed.

 

2. 2015 Beijing Film Festival--Black Screen Crash
In 2015 fifth Beijing International Film Festival, on the new movie directed by Dapeng <A Hero Or Not> award ceremony, when the director published the award-winning speech, part of LED display screen background suddenly became black. This incident made the whole programming division and all the actors were so embarrassment.

LED display screen appears blank screen event has great influence, even caused some irreparable live accidents, especially like the Olympic Games, live Film Festival Occasions. Terminal customers, rental business and LED display supplier will have a lot of losses, especially for rental and manufacturers, that may caused them lost some very important clients, affect the future cooperation. Therefore, as an LED display screen manufacturer, blank screen is a problem worthy of us attention.

 

What caused LED Display Blank Screen?

It is understood, 80% LED display malfunction are because of the following reasons : AC power distribution, terminal, connector, signal and low voltage DC connection ,module, fan, plastic shell components and so on. All these matters may lead LED display screen blank or partial black, mosaic, no signal.

The rest of faults mostly(80%) caused by these reasons: PCB welding spot, capacity, connector, LED lights and low protection grade of cabinets. bolt corrosion of metal hardware, control card fault. The above several reasons also made LED dead lights, highlight, one or more rows is not lit, missing colors and so on. If it is the control card wrongs, the screen images would irregular display.

In the process of control system is used, occasionally had a black screen appears in the LED display. The same phenomenon might cause by several different factors and the screen turns black process will also be different because of the environment. For example, sometimes the screen is suddenly black and sometimes it is gradually turn black or it could be black after sending the content.

 

How to deal with these problems?

1.Make all the components has been fully powered on correctly.
2.Check and repeatedly confirm that whether the connector of controller is loose off. If the screen turn black in the process of loading, which means the communication line is loosening and interruption cause the blank screen. Under the circumstance, please manual examination to solve the problem quickly.
3.Check and confirm the HUB distribution board is connected correctly with LED screen and main control card.
4. Please check and confirm whether the 50P flat cable connected with the control card & HUB distribution board is loose or invert or not .
5. If your display interface definition and HUB board does not match , the black screen phenomenon will appear too. Please double check your jumper is loose or not, open circuit or short circuit phenomenon.
If you have the corresponding the signals ABCD one by one, please check the OE signal is connected properly.