Have you ever seen a large LED screen with black screen in a shopping mall? Eighty times the heat dissipation is not done and the chips are burned! Today, let’s talk about this problem that is easily overlooked but fatal - where should LED screens dissipate heat?

▍​​Where does the heat come out? ​ ​
If you take apart the screen, you will understand: the temperature of the driver chip can reach 85℃ when it is working, and the power module is even hotter. The actual data show that ordinary LED screens have a power of 800W per square meter, and 60% of them are converted into heat. This is like lighting a bathroom heater light in a closed box. How long can it last without heat dissipation?

There is a living example: At a concert last year, the tiles on the stage suddenly became dark after three hours. Later I found that the heat dissipation hole was installed facing upwards and the heat was held in the box. Do you think this design is a lack of stubbornness?

▍​​Six major heat dissipation locations​​

1. ​​Box material​ ​: The thermal conductivity of aluminum-magnesium alloy is 200W/(m·K), 4 times stronger than iron sheet, and the cost is expensive but the value is
2. ​​Heat dissipation hole layout​ ​: The air inlet at the bottom + the air exhaust at the top form a circulation, the aperture should be less than 1.5mm to prevent insects
3. ​​Thermal silicone pad​ ​: Fill the 0.01mm gap between the chip and the heat sink, and the temperature difference drops by 15 times℃
4. ​​Fan configuration​ ​: At least 2 4020 turbo fans per square meter, the noise must be controlled below 45 decibels
5. ​​Heat sink shape​ ​: Fishbone type has 30% more surface area than flat type, but it is easy to accumulate dust
6. ​​Intelligent temperature control​ ​: The brightness will automatically drop over 65℃, which is more protective than forced shutdown

Here is a comparison data:

▍​​The installation environment hides great questions​​
Don’t think that everything will be fine if you buy a good screen! If you don’t pay attention to these three installation details, the screen will still be burned:

• The outdoor screen should be more than 1 meter away from the green belt, otherwise willow catkins will block the heat dissipation hole
• Do not install the indoor screen against the wall, and leave at least 10cm of air duct space
• The seaside project must choose a galvanized plate box, and ordinary aluminum materials will be corroded in three months.

A coastal city in the south suffered a loss and had a collective renovation of outdoor screens that had been installed for half a year. When I took it apart, I saw that the heat sink was rusted like a honeycomb, and the salt in the sea breeze nipped through the metal. Later it was replaced with stainless steel. Although it was a little more expensive, it had no heat dissipation failure in three years.

▍​​Personal opinion time​​
I think the future cooling technology must take the path of "both internal and external cultivation". Now some high-end screens have begun to use phase change materials. When the temperature is high, heat absorption and melting, and when the temperature is low, solidification and heat release. This trick is much more reliable than pure fan heat dissipation. However, the cost is still too high, and it is estimated that it will take two years to become popular.

Just remember this formula for ordinary users:​ ​Metal box is the foundation, air convection cannot be blocked, so clean the dust regularly.​ ​. If you have enough budget, you can directly use the liquid-cooled cooling system, although it is a bit expensive, but it can be used for five years without repair, which is more cost-effective. Do you think this is the reason?

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