What are the reasons for the large LED screen to catch fire?

First, the power cord: the quality of the wires on the market is not uniform. Many of the wire spools are copper-clad aluminum, and the surface looks like a copper wire. In practice, they are aluminum alloy wires. This kind of wire is generally used for temporary wires, and basically cannot be used for On the right track. There are also questions about the copper quality of the copper wire, the question about the insulation layer, and the question about the size of the wire (generally, it is required to be equipped with more than 1.2 times the maximum power of the display). These questions only need to ignore one of these questions, and hidden dangers will be buried. The present brings great disaster;　

Second, the power supply: Inferior power supply is used, or the maximum limit is used to use the extra power of the power supply, which causes the power supply to temporarily overload the task (normally only 70% of the extra power of the power supply can be used), and then the power cord terminal is inferior and ineffective. To be sure, these can all be reasons for inducing vigilant hidden dangers;

Third, PCB board: its own materials are inferior, the copper coating is too thin, the plan is unreasonable, and the poor craftsmanship causes the copper wire to have burrs, etc., and the circuit will short circuit, which becomes the source of the fire alarm;

Fourth, the heat dissipation system. LED large screens work at high temperatures, and heat dissipation issues become the first issue that needs to be dealt with. If the cooling air duct plan is unreasonable, it is easy to cause dust to collect on the main shaft, power supply and main board of the electric fan, resulting in poor heat dissipation, short circuit of electronic components, and stuck electric fan, which may cause vigilance.

Next, let's take a look at the various heat dissipation of LEDs:

1. The fan is used for heat dissipation. The lamp housing uses a long-life and high-efficiency fan to enhance heat dissipation. This is a common method with low cost and good effect;

2. Use aluminum fins, which is the most common way to dissipate heat. Use aluminum fins as a part of the shell to increase the heat dissipation area;　

3. Aerodynamics uses the shape of the lamp housing to create convective air, which is the lowest cost method of enhancing heat dissipation;

4. Surface radiation heat dissipation treatment, the surface of the lamp shell is treated with radiation heat dissipation. The simpler is to apply radiation heat dissipation paint, which can take the heat away from the surface of the lamp shell by radiation;

5. Integration of heat conduction and heat dissipation-the use of high thermal conductivity ceramics, the purpose of lamp housing heat dissipation is to reduce the operating temperature of the LED high-definition display chip, because the expansion coefficient of the LED chip is very different from the expansion coefficient of our usual metal heat conduction and heat dissipation materials. The LED chip cannot be directly soldered to avoid high and low temperature thermal stress from damaging the LED large screen chip;

6, heat pipe heat dissipation, using heat pipe technology to conduct heat from the large LED screen chip to the heat dissipation fins of the shell;.　

7. The thermally conductive plastic shell is filled with thermally conductive material when the plastic shell is injection molded, so as to increase the thermal conductivity and heat dissipation capacity of the plastic shell.