LED display common problems and troubleshooting methods

August 12, 2020

The composition of the LED dot matrix display: consisting of a plurality of LED light emitting diodes packaged together, is an emerging display device. In order to explain the principle of LED dot matrix display, a display system consisting of hardware and software is designed and fabricated with the single chip as the control core. The circuit can realize various display forms such as rolling shutter, upshifting and left shifting of any number of Chinese characters through button control, and can be widely used in public places such as airports, shopping malls, hospitals, etc. for text advertisement promotion and information release. Moreover, it has the characteristics of small size, simple hardware circuit structure and easy implementation.
Fault phenomenon
image
Possible cause
Method of exclusion
The screen does not work, the sending card is flashing green light
Black screen
The screen is not powered
The network cable is not connected well.
Receive card has no power or the supply voltage is too low
Send card is bad
The signal transmission intermediate device is connected or has a fault (eg function card, repeater)
Check that the screen is powered normally.
Check reconnect the network cable
Ensure that the power supply DC output is powered at 5-5.2V
Replace the sending card
Check connection or replace function card (repeater)
The screen does not work, the sending card green light does not flash
Black screen
DVI line is not connected
Graphics card property settings are incorrect
The software chose to turn off the large screen power supply.
The sending card is not inserted or there is a problem with the sending card
Check DVI cable connector
Reset replication mode
Software selection to open large screen power supply
Re-insert the sending card or replace the sending card
Prompt "Large screen system not found" at startup
The serial cable or USB cable is not connected to the sending card.
Computer COM or USB port is bad
Serial cable or USB cable is bad
Send card is bad
No USB driver installed
Confirm and connect the serial cable
Replace the computer
Replace the serial cable
Replace the sending card
Install new software or install USB driver separately
Strips with the same height as the light board do not display
Flat cable contact is not good or disconnected
The junction shows the former output of the light board or the latter input has a problem.
Reinsert or replace the cable
First determine which display module is faulty and then replace the repair
Some modules (3-6 blocks) are not displayed
Power protection or damage
AC power cord is not in good contact
Check to confirm that the power supply is normal.
Reconnect the power cord
The entire box is not displayed
220V power supply line is not connected
There is a problem with the network cable transmission.
Receive card damage
HUB board is inserted into the wrong position
Check the power supply line
Confirm replacement of network cable
Replace the receiving card
Reinsert HUB
The whole screen is spent, the picture is moving
1 driver loader is wrong
2The network cable of the computer and screen is too long or the quality is not good.
3 send card is bad Re-load the receiving card file
Reduce the length of the cable or replace it
Replace the sending card
Display unit displays the same content for each display unit
No display connection file sent
Reset the send screen file, and connect the network cable of the computer connected to the output port of the send card near the indicator light when sending.
The display brightness is very low and the display image is blurred
1 send card program error
2 function card settings are wrong
1Restore the default settings of the sending card and save
2 set the display monitor to a minimum brightness value of 80
Zinc Rod high purity of over 99.995% was widely used in vacuum coating and other purposes.
Zinc Rod
Zinc Rod,Pure Zinc Rod,Zinc Anode Rod,Zinc Welding Rod
Shaoxing Tianlong Tin Materials Co.,Ltd. , https://www.tianlongspray.com

Fault phenomenon	image	Possible cause	Method of exclusion
The screen does not work, the sending card is flashing green light	Black screen	The screen is not powered The network cable is not connected well. Receive card has no power or the supply voltage is too low Send card is bad The signal transmission intermediate device is connected or has a fault (eg function card, repeater)	Check that the screen is powered normally. Check reconnect the network cable Ensure that the power supply DC output is powered at 5-5.2V Replace the sending card Check connection or replace function card (repeater)
The screen does not work, the sending card green light does not flash	Black screen	DVI line is not connected Graphics card property settings are incorrect The software chose to turn off the large screen power supply. The sending card is not inserted or there is a problem with the sending card	Check DVI cable connector Reset replication mode Software selection to open large screen power supply Re-insert the sending card or replace the sending card
Prompt "Large screen system not found" at startup		The serial cable or USB cable is not connected to the sending card. Computer COM or USB port is bad Serial cable or USB cable is bad Send card is bad No USB driver installed	Confirm and connect the serial cable Replace the computer Replace the serial cable Replace the sending card Install new software or install USB driver separately
Strips with the same height as the light board do not display		Flat cable contact is not good or disconnected The junction shows the former output of the light board or the latter input has a problem.	Reinsert or replace the cable First determine which display module is faulty and then replace the repair
Some modules (3-6 blocks) are not displayed		Power protection or damage AC power cord is not in good contact	Check to confirm that the power supply is normal. Reconnect the power cord
The entire box is not displayed		220V power supply line is not connected There is a problem with the network cable transmission. Receive card damage HUB board is inserted into the wrong position	Check the power supply line Confirm replacement of network cable Replace the receiving card Reinsert HUB
The whole screen is spent, the picture is moving		1 driver loader is wrong 2The network cable of the computer and screen is too long or the quality is not good. 3 send card is bad	Re-load the receiving card file Reduce the length of the cable or replace it Replace the sending card
Display unit displays the same content for each display unit		No display connection file sent	Reset the send screen file, and connect the network cable of the computer connected to the output port of the send card near the indicator light when sending.
The display brightness is very low and the display image is blurred		1 send card program error 2 function card settings are wrong	1Restore the default settings of the sending card and save 2 set the display monitor to a minimum brightness value of 80