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LED Display Common Problems and Solutions

LED display is one of the most popular electronic products, but no matter what product is in use, there will be various failures. What if it is expensive to ask someone to repair it? We are here to introduce some common problems and solutions.

One, the whole screen is not bright (black screen).  
1. Check whether the power supply is energized.  
2. Check whether the signal cable and USB cable is connected and whether it is connected incorrectly.  
3. Check whether the green light between the sending card and the receiving card flashing.  
4. Whether the computer display is protected, or the computer display area is black or pure blue.  

Two, the whole LED module is not bright.
1. The horizontal direction of several LED modules are not bright, check whether the cable connection between the normal LED module and the abnormal LED module is connected, or whether the chip 245 is normal.  
2. The vertical direction of several LED modules are not bright, check whether the power supply of this column is normal.
led display for shop

Three, top several lines of LED module are not bright   
1. Check if the line pin is connected to the 4953 output pin.  
2. Check whether 138 is normal.  
3. Check whether 4953 is hot or burned.  
4. Check whether 4953 has a high level.  
5. Check whether the control pins 138 and 4953 are connected.  

Four, the LED module lacks color   
Check whether the 245RG data has output.
 

Five, the top half part or bottom half part of a LED module is not bright or display abnormally.   
1. Whether there is OE signal on the 5th leg of 138.  
2. Whether the signals of the 11th and 12th legs of 74HC595 are normal; (SCLK, RCK).   
3. Whether the connected OE signal is normal; (open circuit or short circuit).   
4. Whether the SCLK and RCK signals of the dual-row pins connected to the 245 are normal; (open circuit or short circuit).

Solution:
1. Connect the OE signal to   
2. Connect SCLK and RCK signals well   
3. Connect the open circuit and disconnect the short circuit   
4. Connect the open circuit and disconnect the short circuit   

Six, a row on a LED module or the row of a corresponding module is not bright or displayed abnormally
1. Check whether the line signal pins of the corresponding module are soldered or missed.  
2. Check whether the corresponding pin of the line signal and 4953 is disconnected or short-circuited with other signals.  
3. Check whether the up and down resistors of the line signal are not soldered or missing soldering.   
4. Whether the line signal output by 74HC138 and the corresponding 4953 is disconnected or short-circuited with other signals.
led display aging
Solution to failure:
1. Solder the missing and missing welding
2. Connect the open circuit and disconnect the short circuit
3. Fill up the unsoldered supplies and weld the missing ones.


Post time: Dec-08-2021

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