Illustration: Frequently Asked Questions about Full Color LED Display

May 26,2021| LED Knowledge

Solutions to common problems of full-color led display: the problems are as follows

1. The entire full-color LED display does not display (all black)
Full-color led display does not display, all black

problem causes

Solution
No AC power input Check the power, turn on the power of the distributor, the power indicator should be on.
 
The computer does not start Start the computer and open the LED studio software.
 
Signal cable failure (Internet cable) Check the signal line and reconnect it until the green indicator light flashes normally
 
Control system failure (sending card) Check whether the sending card is working properly (the green indicator light flashes, and the red indicator light stays on). If the green indicator light is off or stays on, it means there is no signal
(If the indicator light is off, it may also be because the power is turned off) The sending card rarely fails. If the interruption does occur, please replace the sending card.

 
The receiving card is not powered Check the input voltage of the receiving card DC5V, and check whether the first receiving card is working properly.
 
DVI cable is not connected Turn off the computer and reconnect the DVI cable.
 
DVI card setting error Set up the LED studio software according to the control system operation steps and reconnect the signal cable (see control system)
2. The full-color LED display screen is garbled
Full color led display screen garbled
Reason for failure Solution
Control system interruption (sending/receiving card)
Check whether the sending card and receiving card are working properly (green indicator
Flashing, the red indicator light is continuously on). If the green indicator light is off or remains lit, it means that there is no signal, the indicator light is off, or it may be because the power is off).
The sending card rarely fails. If the interruption really occurs, please replace the sending card
Wrong LED studio setting or wrong signal line connection
Set up the LED studio software according to the control system operation steps and reconnect the signal cable (please refer to the control system operation manual)
         
3. The sequence of the full-color led display screen is abnormal or overlapping.
The sequence of the full-color led display screen is abnormal or overlapping
problem causes Solution
Incorrect connection of the cabinet or signal cable (flat cable) Check and reconnect the signal cable according to the control system operation steps (please refer to the control system operation manual)
4. Full-color LED display screen jitters or flickers

problem causes Solution
Ground wire is disconnected Check the connection between the entire screen and the ground wire
Control system interruption (sending/receiving card) Check whether the sending card and the receiving card are working properly (the green indicator light flashes, and the red indicator light stays on). If the green indicator light is off or remains lit, it means that there is no signal and the indicator light is off. It may also be because the power is off.
close). The sending card rarely fails. If the interruption really occurs, please replace the sending card
Control system error voltage Control system input voltage DC 5V
Signal cable (network cable) signal loss Check the signal cable (Internet cable), reconnect the cable
There is a problem with the LED studio setup Reset the LED studio software settings according to the LED software manual
DVI card setting error Reset the DVI settings according to the "Control System Operation Manual"

5. The full-color LED display screen is not fully displayed
Full-color led display screen is not fully displayed
problem causes Solution
Control system interruption (sending/receiving card) Check whether the sending card and the receiving card are working properly (the green indicator light flashes, and the red indicator light stays on). If the green indicator light is off or remains lit, it means that there is no signal and the indicator light is off.
It may also be because the power is turned off). The sending card rarely fails. If the interruption does occur, please replace the sending card.
Wrong LED studio setting or wrong signal line connection Set up the LED studio software according to the control system operation steps and reconnect the signal cable (please refer to the control system operation manual)
6. The led screen and the computer cannot be displayed simultaneously
The led screen cannot be displayed in sync with the computer
problem causes Solution
DVI card setting error Check the DVI card settings, the multi-display mode should be "duplicate".


Answers to common questions about LED screen cabinets, the questions are as follows:
 
1. A single module of the LED screen box does not display
LED screen single module does not display
problem causes Solution
electricity failure Check whether the cabinet power supply is normal.
Failed to receive card (the last cabinet is not displayed)
Check whether the receiving card is working properly (the green indicator light flashes, and the red indicator light stays on). If the green indicator light is off or stays on, it means
There is no signal (if the indicator light is off, it may also be because the power is off). If the interruption does occur, please replace the receiving card.
Signal cable connection error Check the signal cable connection between the cabinets and reconnect it.
Answers to common questions about led display modules, the questions are as follows:

1. The led display module does not display
The led display module does not display
problem causes Solution
Wrong module input voltage Module input voltage should be 5V or 3.3V
The input signal cable (flat cable) is not well connected Reconnect the input signal cable (flat cable)
The input signal cable (flat cable) is faulty
Change the input signal cable (flat cable)
74HC245 IC failure Replace 74HC245 IC
2. Only half of a module is displayed
The led display module only displays half
problem causes Solution
74HC245 IC short circuit Clean the short-circuit point or replace 74HC245 IC
The first driver IC (ie MBI5024) is short-circuited at the fault location Clean the short-circuit point or replace 74HC245 IC
Wrong LED studio setting or wrong signal line connection Set up the LED studio software according to the control system operation steps and reconnect the signal cable (please refer to the control system operation manual)
3. One line of led display module does not display
One line of led display module does not display
problem causes Solution
74HC245 IC short circuit Clean the short-circuit point or replace 74HC245 IC
Chip 4953 or HC138 short circuit Check the related chips 4953 and HC138, and clear the short-circuit points or replace the chip
4. The missing circuit on the LED module (used to scan the screen)
Missing wires on the LED module
problem causes Solution
Missing line on the LED module (used to scan the screen) Clean the short-circuit point or replace the IC (MBI5024)
Line resistance decomposition Change resistance
5. One or two rows of LED modules do not work
One or two rows of LED modules do not work
problem causes Solution
Missing line on the LED module (used to scan the screen) Clean the short-circuit point or replace the IC (MBI5024)
Line resistance decomposition Change resistance

6. Single pixel is missing, dark or flickering (used for static pictures)
Single pixel is missing, dark or flickering
problem causes Solution
LED light is broken Replacing the LED lamp ( how to replace the LED lamp beads by yourself )
The driver IC (ie MBI5024) is short-circuited Clean the short-circuit point or replace the IC (MBI5024)
7. There are several modules on the led display screen that do not display
There are several modules on the led display screen that do not display
problem causes Solution
The signal wire is not connected well (no display on a row of modules) Check the signal cable connection and reconnect, while checking the power supply of the first module in the row
The power connection is not good (the corner of the cabinet is not displayed) Check whether the relevant power supply is working normally and whether the connection is good
8. Lack of color on the led display module
Color is missing on the led display module
problem causes Solution
The signal line is not well connected (the color is missing a row of modules) Check the signal cable connection and reconnect it, and check the electrical power of the first module in the row.
Module failure (color loss on a single module) Replace the module
The module is damaged or the flat cable is not connected well (the color on some modules is missing) Replace the module or reconnect the flat cable 

  Article KeyWords:Full Color LED Display Questions

 

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