FAQ and solutions of LED display
Fault Reason Solution
Whole screen no display a. No AC power supply. Check main power cable and reconnect it.
b. The computer isn't working Check the computer
c. Main data cable is broken. Reconnect the main data cable correctly or change a new one.
d. Control system is broken. Check indicators on sending card and receiving card, if red one keep lighting while green one blinking when the system is ok, otherwise use spare parts to replace.
e. Receiving card is no power. Check power cable between receiving card and power supply
f. Software setting is wrong. Correct the software setting to suit the control system.
Whole screen blinking. a. Ground wire is broken. Connect the ground wire between the computer and screen.
b. Control system is broken down. Change the control system.
c. Some signal of the data cable is lost. Examine the data cable, reconnect it correctly or change a new one.
d. Refresh rate setting is wrong Correct the Refresh rate setting
Module not work a. Unit module has no  power supply Voltage for unit module is 5V.
b. Flat cable between two modules is cut off. Change the flat cable.
c. 245 IC is broke down. Change new 245 IC
part of module works abnormally Signal of the part is wrong. Check the resistance near the 5026 IC which control that area.
Rows of module are not lighting Corresponding 4953 or 245 IC is not working. Examine the corresponding 4953 or 245 IC
Columns of module are not lighting Corresponding 5026 IC is not working Examine 5026IC or change a new one.
Dots out of control Pins or 5026 IC short connected Re-soldering the 5026IC or change a new one.
The display texts have shadows. Data cable or DVI cable connected incorrectly Reconnect main data cable or DVI cable between graphic card and sending card
What are the characteristics of the stage LED display?

Nowadays, those large-scale stage performance programs are very popular. Of course, stage LED displays are also often used in TV shows and event performances, such as some live broadcasts and performances.  The creation of advertisements and scene backgrounds can fully perform the performance through the stage LED display. The realistic picture is perfectly combined with the music and lighting, giving a shocking picture with a modern sense.

  In order to meet the different requirements of choreography design, the stage LED display requires a large difference in structure and system composition than the traditional fixed installation LED display. The following points are the differences:

  1. Multiple LED rental cabinets are spliced into a large screen display area. At present, the dimensions of LIGHTIN LED rental cabinets are 500mm × 500mm, 1000mm × 500mm, 500mm × 1500mm, and so on.

  2. In order to facilitate installation and disassembly, the LED cabinet needs to be thin and light; as the display screen of the stage LED display becomes clearer and the pixel pitch is smaller and smaller, in order to better ensure the quality and splicing accuracy of the LED display, the cabinet is required to be sturdy and durable. At present, the die-cast aluminum cabinet is the most common on the market.

 3. In order to improve the splicing accuracy and disassembly efficiency of the LED display rental cabinet, the cabinet should be equipped with a locking device. If you need better cabinet, a special provision mechanism between the LED display cabinet should be added.

 In order to ensure that there may be bumps and lamp beads on the cabinet during frequent disassembly, LED display manufacturers usually install a layer of protective components called masks in front of the LED modules.


The Compendium of LED display calculation methods

LED display screens often need to use some calculation formulas for conversion during the installation, such as spacing, length, and height, the number of modules used, etc.

Now we summarizes the calculation formulas commonly used in daily life for your reference.

 1.Point pitch calculation method

 The center distance between each pixel and each adjacent pixel;

 Each pixel can be

 One LED light [eg: P10 (1R)],

 Two LED lights [eg: P16 (2R)],

 Three led lights [eg: PH16 (2R1G1B)],

 P16 dot pitch is 16MM; P20 dot pitch is 20MM; P12 dot pitch is: 12MM

2, the length and height calculation method

 Dot Pitch x Dots = Length / Height

 For example: P16 length = 16 points × 1.6㎝ = 25.6㎝

 Height = 8 points × 1.6㎝ = 12.8㎝

 P10 length = 32 points × 1.0㎝ = 32㎝

 Height = 16 points × 1.0㎝ = 16㎝;

 3.The calculation method of the number of screen modules

 Total area ÷ module length ÷ module height = number of modules used

 For example, the number of modules of 10 square P16 outdoor led displays is equal to:

 10 square meters ÷ 0.256 meters ÷ 0.128 meters = 305.17678 ≈ 305

 Precise calculation method: length used modules × height used modules = total number of used modules

 For example, P16led display with a length of 5 meters and a height of 2 meters uses the number of modules:

 Number of modules used = 5 meters ÷ 0.256 meters = 19.53125 ≈ 20

 Number of high-use modules = 2 meters ÷ 0.128 meters = 15.625 ≈ 16

 The total number of modules used = 20 × 16 = 320

 4.A calculation method of the visible distance of the LED display

 RGB color mixing distance The distance between three colors mixing into a single color:

 LED full-color screen line of sight = pixel pitch (mm) × 500/1000

 The smallest viewing distance can show the distance of smooth image:

 The visual distance of LED display = Pixel pitch (mm) × 1000/1000

 The most suitable viewing distance The distance at which a viewer can see a highly clear picture:

 The best viewing distance for LED display = pixel pitch (mm) × 3000/1000

 Farthest viewing distance:

 Longest viewing distance of LED display = screen height (m) x 30 (times)

 5, the LED display power supply calculation method

The full-color unit board is calculated by the maximum power when it is fully lit.

 a. The number of unit plates that a power supply can take = the voltage of the power supply * the current of the power supply / the number of horizontal pixels of the unit plate / the number of vertical pixels of the unit plate / 0.1 / 2

 For example: semi-outdoor P10: 5V40A power supply can bring: 5 * 40 / (32 * 16 * 0.1 / 0.5) = 7.8 whichever is larger;

 b. Find the required number of power sources according to the total power of the screen body = average total power/power of one power supply (power supply voltage * power supply current)

 For example a bar screen with 12 P10 modules in long and 3 P10 modules with high usage: 36 modules in total.  Then the number of required power supply = 32 * 16 * 0.1 * 36 * 0.5 / 5/40 = 4.6 whichever is larger (5 power supplies)

 6, the LED display power calculation method

 The formula for power is P = UI

 P is power, U is voltage, and I is current.

 Usually the power supply voltage we use is 5V, and the power supply is 30A and 40A;


  1. Calculation method of LED display resolution

 LED display per square resolution = 1 / pixel pitch (unitized as M) / pixel pitch (unitized as M)

 For example: P16 per square resolution = 1 / 0.016 / 0.016 = 3906 DOT (points)

How many multi-clock connection form of LED display you know?

It is not easy to assemble the LED electronic display as a whole, just like configuring an assembled computer. Even the LED display is more complicated to assemble, and there are more steps to pay attention to.

It is connected by many modules, and the modules are assembled by many lamp beads. The steps are one by one, and the rings must be careful, otherwise, the effect of the LED display will be affected.  The LED display is important in connection, once the connection is not good, the next step is not good.  So today, let ’s explore what are the ways of LED display connection?  Only by knowing these aspects will the LED display be safer and better, because this is also related to the high brightness power of the LED display. The cost of a single package of high-power high-brightness LED is high, and it is currently in practical use.  The power of a single high-brightness LED display is very small.  Therefore, it is necessary to arrange and combine multiple LED displays according to requirements. On the one hand, it can meet the requirements of a large range, higher brightness, dynamic display, color change, and other applications, and on the other hand, it can meet the drivers of LED-compatible drivers matching requirements.

1, the overall series form: Generally, the LED1-n in the simple series connection method is connected end to end, and the current flowing through the LED display screen is equal.  The other is an improved method with a bypass connection of 1.1.

2, the overall parallel form: one is a simple parallel form, the other is an independent matching parallel form.  In the simple parallel mode, LED1-n are connected in parallel end to end, and the voltages on each LED are equal when working.  This kind of reliability is not high, but it also strives to adopt an independent matching parallel form for this problem. It has the characteristics of a good driving effect, complete protection of a single LED display and does not affect other work in the event of a fault.

3, the mixed connection form: The advantages of parallel and series proposed by the appeal are comprehensive. It also includes 2 types.  One is the serial-parallel mixed-mode, and the other is the parallel-parallel mixed mode.

4, the cross-array form: The cross-array form is mainly proposed to improve the reliability of the LED display work and reduce the failure rate.