Common faults and treatment methods of LED display

The continuous increase in the demand for outdoor digital advertising applications has made the market application scale of LED displays expand rapidly, and the user group has become more and more popular. How to deal with some common faults in daily applications has become an urgent problem for industry users. This article will comprehensively sort out the common problems in the daily application of LED displays and simple solutions for you.

1. The display screen does not work, and the green light of the sending card flashes (made into a retractable type)

1. Cause of failure:

1) The screen is not powered;

2) The network cable is not connected properly;

3) The receiving card has no power supply or the power supply voltage is too low;

4) The sending card is broken;

5) The signal transmission intermediate equipment is connected or faulty (such as: function card, optical fiber transceiver box);

2. Troubleshooting method:

1) Check to confirm that the power supply of the screen body is normal;

2) Check and reconnect the network cable;

3) Ensure that the DC output power supply of the power supply is 5-5.2V;

4) Replace the sending card;

5) Check the connection or replace the function card (optical fiber transceiver box);

2. The display screen does not work, and the green light of the sending card does not flash

1. Cause of failure:

1) The DVI or HDMI cable is not connected properly;

2) The copy or expansion mode is not set in the graphics card control panel;

3) The software chooses to turn off the power of the large screen;

4) The sending card is not inserted in place or there is a problem with the sending card;

2. Troubleshooting method:

1) Check the DVI cable connector;

2) Reset the copy mode;

3) The software chooses to turn on the power of the large screen;

4) Re-insert the sending card or replace the sending card;

3. Prompt “big screen system not found” when starting

1. Cause of failure:

1) The serial port cable or USB cable is not connected with the sending card;

2) The COM or USB port of the computer is broken;

3) The serial cable or USB cable is broken;

4) The sending card is broken;

5) The USB driver is not installed

2. Troubleshooting method:

1) Confirm and connect the serial cable;

2) Replace the computer;

3) Replace the serial line;

4) Replace the sending card;

5) Install the new version of the software or install the USB driver separately

4. The strip with the same height as the light board does not display or partially does not display, lack of color

1. Failure reasons:

1) The flat cable or DVI cable (applicable to submarine series) is not well connected or disconnected;

2) There is a problem with the output of the former or the input of the latter at the junction

2. Troubleshooting method:

1) Re-plug or replace the cable;

2) First determine which display module is faulty and then replace it for maintenance

5. Some modules (3-6 blocks) are not displayed

1. Failure reasons:

1) Power protection or damage;

2) The AC power cord is not in good contact

2. Troubleshooting method:

1) Test to confirm that the power supply is normal;

2) Reconnect the power cord

6. The whole box is not displayed

1. Failure reasons:

1) The 220V power supply line is not connected properly;

2) There is a problem with the network cable transmission;

3) The receiving card is damaged;

4) HUB board is misplaced

2. Troubleshooting method:

1) Check the power supply line;

2) Confirm the replacement of the network cable;

3) Replace the receiving card;

4) Re-insert the HUB

7.the whole screen flower dots, picture and shadow button movement

1. Failure reasons:

1) The driver loader is incorrect;

2) The network cable of the computer and the screen is too long or the quality is not good;

3) The sending card is broken

2. Troubleshooting method:

1) Re-operate to load the receiving card file;

2) Shorten the length of the network cable or replace it;

3) Replace the sending card

8. Each display unit of the entire display screen displays the same content

1. Failure reasons:

Display connection file not sent

2. Troubleshooting method:

Reset the settings to send the screen-connected file, and insert the network cable connected to the computer to the output port of the sending card near the indicator light when sending.

9. The brightness of the display screen is very low, and the displayed image is blurred.

1. Failure reasons:

1) Error in sending card program;

2) The function card setting is incorrect

2. Troubleshooting method:

1) Restore the default settings of the sending card and save them;

2) Set the minimum brightness value of the display monitor to be above 80;

10. The whole screen is shaken or ghosted

1. Failure reasons:

1) Check the communication line between the computer and the large screen;

2) Check the DVI cable of the multimedia card and the sending card;

3) The sending card is broken.

2. Troubleshooting method:

1) Replug or replace the communication cable;

2) Punch and insert the DVI cable to reinforce;

3) Replace the sending card.

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