Shenzhen Lianchengfa Technology Co., Ltd.

In today's era of digital information display, LED large screen is widely used in commercial advertising, stage performances, sports events, traffic hubs and many other areas, with its colourful, high brightness, large size visual effects to attract the attention of countless viewers. However, as with any electronic device, LED screen in the long-term use of the process will inevitably have a variety of failures, which requires professional maintenance techniques and methods to make it back to normal, continue to bloom. LCF editor will introduce the LED screen in this article, the phenomenon of common failures and causes of analysis, maintenance tools and materials to prepare.

First, the common failure phenomenon and cause analysis

(A) partial black screen or screen

This is one of the more common failure of the LED screen. The cause may be multifaceted. On the one hand, it may be a failure of the LED lamp beads themselves, such as aging and damage to the lamp beads, resulting in part of the region can not be normal light, resulting in a black screen or screen phenomenon. On the other hand, loose, damaged or poor contact of the wires connecting the lamp beads can also cause such problems. In addition, the control card failure, such as control signal output abnormality, can not correctly drive the corresponding regional display, will also cause local display abnormalities.

(B) Uneven brightness of the whole screen

Uneven brightness of the whole screen will seriously affect the visual effect of the LED screen. This may be due to unstable power supply or uneven distribution. Differences in the output voltage of the power supply module in different areas will make the corresponding LED module brightness is different. Furthermore, the batch difference of LED lamp beads, even if the same model of lamp beads, its luminous efficiency may be slightly different, if a large number of mixed use of different batches of lamp beads in the production or maintenance process, and not reasonably allocated, it is easy to lead to the whole screen brightness is uneven. In addition, the poor heat dissipation of the display, part of the area temperature is too high, will make the region of the lamp beads brightness attenuation accelerated, and then the uneven brightness of the situation.

(C) display colour deviation

When the LED big screen display colour deviation, the first thing to consider is the wavelength drift of the LED lamp beads. With the increase of the use of time, the light-emitting properties of the lamp beads may change, resulting in colour deviation from the normal range. Secondly, improper setting of the colour correction parameters of the control card is also a common cause. If the colour correction parameters are not accurately set according to the characteristics of the lamp beads actually used during installation and commissioning or post maintenance, the colour of the screen display may deviate. In addition, the interference of the signal transmission line may also affect the normal display of colour, such as the line is subject to strong electromagnetic interference, which may lead to distortion of the control signal, thus making the display of colour anomalies.

(D) No signal input or display garbled code

This kind of fault is usually related to the signal transmission link. May be the signal source equipment (such as computers, video players, etc.) and the LED screen between the connection line is loose, damaged or poor contact, resulting in the signal can not be transmitted normally. It is also possible that the input interface of the control card is faulty and cannot receive the signal from the signal source correctly. In addition, the control card program error or incompatible version, in processing the signal may appear garbled phenomenon, so that the screen can not be displayed properly.

Second, maintenance tools and materials preparation

(A) the basic tools

Repair LED screen needs to be equipped with some basic tools, such as screwdrivers, spanners, pliers, etc., for the removal and installation of the display screen shell, module and other components. In addition, soldering iron, soldering wire, solder absorber and other welding tools are needed to repair the circuit connection or replace the electronic components. Multimeter is an essential tool for measuring the voltage, current, resistance and other parameters in the circuit to help determine the circuit failure point.

(B) professional testing equipment

In order to more accurately detect the failure of the LED screen, some professional testing equipment is also needed. For example, LED display test card, can quickly detect the display module, lamp beads, control card and other components of the working state, to determine the scope of failure. Oscilloscope can be used to detect the signal waveform, to see whether the control signal, power supply signal and so on are normal, which helps to analyse the problems in signal transmission. Spectrum analyzer can measure the spectral characteristics of the LED lamp beads, accurately determine the light-emitting properties of the lamp beads and colour parameters, for the solution of the display of colour deviation and other issues have an important role.

(C) maintenance materials

In the repair process, it is necessary to prepare some common repair materials, such as LED beads, wires, power lines, resistors, capacitors, diodes and other electronic components to replace the damaged parts. At the same time, it is also necessary to prepare auxiliary materials such as heat dissipation silicone, insulation tape, etc., which are used to improve the heat dissipation performance of the display and ensure the insulation safety of the circuit.

The above is the LCF editorial to put together a common failure phenomenon and cause analysis of LED large screen, maintenance tools and materials to prepare, I hope to help you, at the same time, welcome to add or correct.LCF is a collection of R & D, intelligence, sales, operation, service in one of the national speciality and speciality of the small giant enterprises, national high-tech enterprises. If you need to buy LED electronic display friends can also directly contact the LED display manufacturer LCF, the big country brand, trustworthy!