Have you noticed that some LED screens that have been used for three years have yellow colors like old photos, while others are as bright as before? The secret is hidden in the cooling system! Last week, I helped my friend repair the large screen in the mall. I took it apart and saw it - good guy, the cooling holes were nested by cockroaches! Today we will talk about this problem that is easily overlooked but fatal.

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​​Three common heat dissipation misunderstandings for beginners​​

1. I thought that cooling is to install a fan (in fact, the air duct design is the soul)
2. Spray dustproof paint into the box to block the pores (jump directly with the breathability cut)
3. Blow the household air conditioner to the front (humidity change accelerates the oxidation of the circuit board)

The lesson from an exhibition hall last year was harsh: the engineer opened the heat dissipation hole directly above the screen, and the hot air was pasted on the ceiling. In summer, the screen temperature soared to 68℃, and the lamp beads were scrapped 15% in half a year. So,​ ​Heat dissipation is not a job of strength, but a job of technology​​。

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​​These four locations are the lifeblood of cooling​​
■ ​​Shark gill structure on the side of the box​​
These wavy holes are not for the sake of good looks! Actual measurements show that the heat dissipation fin with a 30° inclination can improve air flow by 23%. The key is whether there is an insect-proof net here - don’t underestimate this layer of gauze net, it can block 90% of flying catfish and ants.

■ ​​Cellular matrix on the back of the module​​
Use a flashlight to shine on the back. If you can see the neat hexagonal honeycomb holes, congratulations on finding the treasure. This design allows heat to be discharged quickly like a highway, and is 40% more heat dissipation efficiency than ordinary round holes.

■ ​​Independent air duct of power bank​​
Have you ever seen a stove that opens a separate exhaust gas when cooking hot pot? High-end screen power systems have this VIP treatment. There is a cold knowledge: the heat generated by the power module accounts for 35% of the entire screen, and the heat dissipation alone can extend the screen life by 2.8 years.

■ ​​Nanocoating between lamp panels​​
This is black technology! Laboratory data from a certain manufacturer shows that spraying a 0.3mm thick graphene coating can reduce the local temperature by 9°C. But be careful of counterfeit goods. If you use a lighter to burn the real goods, you won’t have scorching marks.

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​​Self-question time​​
Q: Will water enter the outdoor screen on rainy days?
A: Good heat dissipation design is more moisture-proof! A truly professional waterproofing solution is "breathing drainage", just like a windbreaker fabric - hot air can come out, but rainwater cannot come in. I will teach you a test method: spray water mist into the heat dissipation hole when the machine is turned on, and if water droplets form, they will meet the standards.

Q: How to judge whether the cooling system is good or bad?
Three-step detection method:

1. After broadcasting the promotional video for 4 hours continuously, touching the border is not hot (≤45℃)
2. Use infrared thermometer to measure different areas, the temperature difference should not exceed 5℃
3. Cool down to normal temperature within 3 minutes after shutdown

Q: Is it more difficult to dissipate heat with a high refresh rate screen?
Just the opposite! Screens above 1920Hz are often equipped with intelligent temperature control, and the heat distribution is more even. There is an abnormal phenomenon: the refresh rate is increased from 960Hz to 1920Hz, and the power consumption is only increased by 18%, but the heat dissipation efficiency can be increased by 31%.

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Editor's opinion: I recently removed a large stadium screen that has not been repaired for five years, and I found that the design of the heat dissipation hole is really exquisite - the top is the air outlet with rainproof eaves, and the bottom air inlet is equipped with a removable filter. What's even more amazing is that the inner wall of the box is covered with thermally conductive silicone pads, which directs the heat from the PCB board to the aluminum alloy frame. So,​ ​Good heat dissipation is like falling in love, you have to go in both directions to last for a long time​ ​. By the way, I would like to remind all bosses that you don’t forget to ask the construction party to present the thermal imaging test report for next acceptance. This is more reliable than any verbal promise... (Suddenly patting your thigh) Ouch! I almost forgot to say that the cooling system of high-end screens can be automatically adjusted according to the ambient temperature. For example, when outdoors at 40℃, it will automatically turn on the storm cooling mode at 40℃, and switch to the silent mode in the middle of the night. This level of intelligence is simply comparable to that of an air conditioner!

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