Do you think this is a coincidence? Last month, Boss Wang from Fengqing Tea City told me that the LED screen that cost RMB 80,000 to install turned into a "crying screen" during the rainy season, with water vapor entering the circuit board along the gaps. What's even more amazing is that when the maintenance technician took it apart, he found that mushrooms were growing in the screw holes! Today we will explain how to choose a truly moisture-proof and anti-friction display screen in Fengqing, where the annual average humidity is 75%.

1. Three fatal injuries of humidity killer

​​Moldy circuit board​ ​It’s no joke. Last year, the screen of a tea shop suddenly became full of green dots. When I opened it, I found that moss had grown on the cable interface. A truly moisture-proof screen must do the following:

• ​​Potting glue depth ≥3mm​ ​(I can’t dig out the gap with my fingernails)
• The thickness of the gold plating layer of the connector is ≥0.8μm (anti-oxidation and rust)

​​condensation murder​ ​The most insidious thing is that when the temperature difference between inside and outside is large, water droplets will form inside the ordinary screen. The worst case I have ever seen: a screen in a hotel lobby suddenly exploded with sparks in the middle of the night, and it turned out that condensation water short-circuited the power module.

​​Water leakage from screw holes​ ​It is impossible to prevent it. During the rainy season, rainwater seeps in along the threads of the screws. There was a screen installed in a restaurant. When I dismantled it half a year later, I found that the screws were all rusty and broken, and the box collapsed and destroyed the front desk computer.

2. Experts’ native methods for inspecting goods

Don’t believe any IP65 certification, bring your own bag​ ​flour​ ​Going to the venue is the most reliable. Sprinkle some flour on the seams of the screen and blow air through your mouth:

• Flour flying around means the sealing strip is not tightened tightly.
• It's really moisture-proof if you can't blow it.
  Another trick: let the seller demonstrate on site​ ​High pressure water gun cleaning​ ​, focus on the heat dissipation holes and interfaces, the real guy is the one who dares to do this.

3. Text traps in parameters

The "moisture-proof treatment" mentioned by the merchant may just be sprayed with a layer of anti-rust paint. You must stick to these parameters:

• ​​Humidity tolerance range 10%-100%RH​ ​(Humidity in Fengqing’s rainy season often exceeds 90%)
• ​​Operating temperature includes condensation conditions​ ​(Suddenly turning on the air conditioner, there is no fogging)
• ​​Power module conformal paint coating​ ​(Rubbed with alcohol 20 times without falling off)

Last year, a tea market owner was in trouble because he bought a screen that clearly said moisture-proof. As a result, water ripples appeared on the screen during the Qingming rainy season. Later, I discovered that the model with an "S" suffix was actually a simplified version, with a moisture-proof rating two levels lower than the standard version.

4. Be careful about the installation location

Don’t install it on the west wall! Fengqing’s Sun Rain specializes in treating dissatisfaction and will teach you a few tricks:

1. Installed at 1 meter extension of the canopy (to prevent diagonal rain splashing)
2. The bottom of the box is raised by 20cm (to prevent water from pouring back on the ground)
3. Installation of heat dissipation holes​ ​Labyrinth moisture-proof cover​ ​(Breathable and rainproof)

A teahouse suffered a great loss when it installed a screen next to a rockery and flowing water. As a result, water mist entered along the heat dissipation holes and burned the driver chip in three months. The repair cost was more expensive than buying a new screen.

5. Bad things you definitely want to ask

​​Q: What should I do if the screen surface becomes foggy? ​ ​
A: Don’t wipe with a rag! Turn on after power on​ ​Dehumidification mode​ ​, it will naturally subside when the internal temperature rises. Forcible wiping will scratch the optical coating.

​​Q: Do I need to turn off my phone when I return to Nantian? ​ ​
A: Big mistake! Keep​ ​Normally open state​ ​On the contrary, it is beneficial to prevent moisture, and the cold machine is more prone to condensation after shutting down. It is recommended to adjust the brightness to the lowest temperature to maintain the temperature.

​​Q: How to deal with ants getting into the screen? ​ ​
A: I have seen this happen with my own eyes! Apply on the bracket when installing​ ​Insect-proof rubber ring​ ​(More than 5cm wide), reapply once a month. Never spray pesticides, chemical corrosion is more deadly than insect infestation.

While having a drink with Lao Zhang, who makes building materials, he revealed that 60% of the LED screens on the market in Fengqing have a generic moisture-proof treatment. Remember to bring one with you next time you purchase​ ​Humidity recorder​ ​, asking the seller to put the screen on in an environment with 85% humidity for 72 hours - real gold is not afraid of moisture, and a good screen can withstand the test of rainy season! (Experts say: Choosing the right model can save you 5,000+ in dehumidifier electricity bills every year)

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