Summary of common problems of LED rental screen

I、 Hardware connection 

1. What supporting components are needed for LED screen? 

 Power distribution system → LED screen→ control system → playback system 

2. What hardware components are needed for the overall construction of LED screens? 

LED screen back frame, screws, butterfly buckle or U-shaped buckle, hanging beam 

3. What are the requirements of the LED screen for the connected control computer? 

System, Memory, CPU, Graphics Card. 

4. LED screen line connection method 

①The signal between the LED screen box and the box is connected by network cable; 

②The power supply between the LED screen box and the box is composed of a power cord connection; 

5. What are the precautions for connecting the LED screen with audio, camera and other hardware? 

The correct connection method, the correct matching of the interface, the interference factors of the scene and the environment.

II、Screen imaging 

1. What is the imaging principle and hardware composition of LED screen? 

Light Emitting Diode. Composition: unit board, cabinet, power supply, receiving card and component connection accessories and wiring. 

2. LED screen rental box points (500*500) 

P2.6 is 192*192, 

P2.9 is 168*168; 

P3.9, 128;

P4.8,104; 

3. The display ratio summary description 

The standard screen ratio is generally 4:3 and 16:9, but 16:9 also has a few exceptions, such as 15:9 and 16:10, because its ratio is close to 16:9, so these three screen ratio of LCD monitors can be called widescreen, in addition to a more special ratio, such as 21:9 and so on. 

4. What are the requirements for LED playback content and materials? 

Content: the theme is clear, the copyright is clear, and there are no political and other conditions for violations. 

Request: 

Video: Produced according to scale, common formats MOV, MP4, encoding H264, HAP; 

Image: RGB, format JPG or PNG;

III、Control system 

1. LED screen through which hardware control system for control? 

Control system: video processor, splicer, video console 

Playback system: control computer, multimedia server 

2. What is the big screen through the realization of split-screen broadcast screen? 

Hardware system: switcher, video console 

Software system: multimedia server 

3. What is the use of hardware for different activity scales? 

Essential equipment for large-scale activities: servers, processors, large sending cards, dual backup systems, fibre-optical, technicians (professional) 

4. The role of the processor 

LED video processor is a special video processor for LED, and the task it needs to complete is to convert the image signal from the outside (such as Blu-ray DVD, computer, high-definition playback box, etc.) into a signal that can be accepted by the LED display, and optimize the video image to make the picture displayed on the LED screen clearer and smoother.

IV、General questions 

1. What are the screen brand manufacturers on the market? What are the differences? 

GLOSHINE（光祥）, LiGHTLiNK（雷凌）, Unilumin（洲明）, Dicolor（深德彩）, TECNON（太龙） (large manufacturers produce large screens, after-sales service is guaranteed, and the service life and color of the products have certain advantages over small manufacturers) 

2. Electricity consumption calculation? 

500mm×500mm single block uses 600W 

3. What are the common LED models? 

P1.8、P2.6、P2.9、P3.91、p4.81、P5.65、P5.68、P10 

4. How to achieve dual backup on large screen? 

Front-end backup: broadcast control system 

Back-end backup: processing system

V、 Building problems 

1. What are the composition methods of special-shaped construction? 

According to the demand of the stage art hoisting, hanging, etc., special demands can contact the manufacturer to customize the special-shaped screen. 

2. How to fix the large screen and precautions? 

Rhea frame, special occasions can be customized frame fixing 

3. How to build a large screen shaped? 

① by the angle of the screen around out

② by the large screen fixed lock out

VI、The scene of the problem 

1. What is the reason for the lag in individual positions on the large screen? How to deal with the solution? 

The rear of the screen signal line dropped, the signal line should be connected to the signal line should be inserted firmly in the socket, repeated checks can be. 

2. Precautions for the use of environmental factors on the large screen? 

Outdoor screen after glue irrigation treatment, just pay attention to the power connection line and line grounding issues. 

3. The unit board appears to be a long time dark, not bright?

Detect whether the module pins and integrated circuits corresponding to faults on the unit board are soldered, short-circuited, or broken-circuited. 

4. The whole section of the unit board is not bright or dark? 

(1) Visually check whether the power supply cable, the cable between the unit board and the indicator light of the power module are normal;  

(2) Use a multimeter to measure whether the unit board has normal voltage, and then measure whether the voltage output of the power module is normal, if not, it is judged that the power module is broken; 

(3) The voltage of the power module is low, and the fine-tuning (fine-tuning of the power module close to the indicator light) makes the voltage reach the standard; Fault phenomenon: The cell board appears in the cell (the unit board is divided into two cells) without red or green. 

5. What are the problems that cause the large screen to go black? 

Power supply, signal, transmission system, control system, LED screen itself, misoperation. 

6. Large screen "grayscale"? 

0-255Brightness change for large screen 

7. Outdoor grayscale debugging? 

Outdoor display due to geographical weather and other impacts, which requires the video processor to have a better picture quality to enhance the ability to have advanced image scaling algorithms to ensure that the video image by scaling, the maximum degree of clarity to maintain the image and grayscale levels. 

In addition, the video processor is also required to have rich image adjustment options and adjustment effects, and process the image brightness, contrast, and grayscale to ensure that the screen output is soft and clear. 

8. Are there any requirements for the on-site environment of LED activities? What are the precautions? Waterproof screen model? 

Outdoor P3.9 and P4.81 screens are not affected by weather conditions in the case of breakpoints on rainy days, but large screens cannot be soaked in water.

Model: P3.9 P4.81, P5.65, P5.95, P10. 

9. What are the causes and solutions of LED screen splash? 

Power distribution systems; Signal transmission, environmental interference 

(1) Driver loading program is not right; 

(2) The network cable between the computer and the screen is too long or the network cable is faulty; 

(3) The sending card or control card is broken; 

(4) Short circuit between the power supply and the control card; 

(5) The output voltage and current of the power supply are unstable; 

10. What is the measurement standard of the quality of the network cable? 

Network cable thickness and weight, and brand.

11. Ground screen 

Mostly used for press conferences, the common ground screen is composed of P4.81+ mask (the main material of the mask is: acrylic, rubber, glass, rubber material is better in comparison). 

12. What are the causes and solutions for spontaneous combustion of large screen power cords? 

(1) Short circuit, overload, power cord quality problems; 

(2) The selected LED is overvoltage (change LED); 

(3) The incoming line is very thin resulting in too much load line overload (check the line, standardize the operation); 

(4) Check the transformer, an inferior transformer may cause the instantaneous output current and voltage to be very high, causing the module to deflagrate. (Replaced power switch).