Hey, I heard that brother Tashi who opened an inn in Diqing recently spent 50,000 yuan to install an LED screen, and it only took three months for a large area to become black? The maintenance man shook his head when he saw it: "This screen can't even withstand ultraviolet rays, it's not as durable as my TV!" "Today we will talk about how to choose a reliable outdoor display screen without paying IQ tax on a plateau with an altitude of more than 3,000 meters.

1. Three fatal issues specific to the plateau

​​UV rays​ ​It’s no joke, an ordinary screen can turn into a “pockmarked face” in half a year. Last year, there was an advertising screen in Dukezong Ancient City, and the surface coating peeled off like it had a skin disease. A truly plateau dedicated screen must do the following:

• ​​Anti-UV coating thickness ≥0.3mm​ ​(Fingernails can’t make white marks)
• ​​Lamp bead glue temperature resistance -30℃~+80℃​ ​(Prevent thermal expansion and contraction from degumming)

​​The temperature difference between day and night can kill people​ ​, if the metal bracket is not handled properly, thermal expansion and contraction can cause the screws to fly. There is a display screen in a parking lot in a scenic area. The temperature difference at night in winter is more than 30 degrees. As a result, the box deformed and the circuit board was torn.

​​Lightning protection has become a life and death line​ ​During the rainy season last year, a hotel screen was struck by lightning and the cashier system was burned down. Must be installed in plateau areas​ ​Level 3 lightning protection module​ ​, a separate grounding copper wire must be thicker than chopsticks.

2. Experts’ native methods for inspecting goods

Don't believe any test reports, bring your own​ ​Infrared thermometer gun​ ​The most practical. Let the seller turn on the phone and play the promotional video for 4 hours, and measure the temperature at these three positions:

1. Power module (be careful when it exceeds 65℃)
2. Lamp bead dense area (temperature difference >15℃ indicates uneven heat dissipation)
3. Cable interface (soldering may occur due to sudden temperature changes)

​​Don’t be fooled by the waterproof test​ ​, take a mineral water bottle and pour water directly into the seam. For a truly waterproof screen, water will flow along the water conduit and will not penetrate into the box. If you see water droplets hanging around the screw holes, run away!

3. Word games in parameters

The "plateau exclusive" mentioned by the merchant may just be a dust cover. Teach you to identify these hard indicators:

• ​​The brightness must be manually locked​ ​(Automatic adjustment will cause drafts under strong light)
• ​​Refresh rate≥3840Hz​ ​(The picture of the prayer wheel will not be smeared)
• ​​Power module redundancy 30% power​ ​(High altitude and low air pressure will affect heat dissipation)

A B&B owner once suffered a loss when he bought a screen marked "Outdoor Highlight". As a result, the brightness automatically lowered when the sun came out, making it impossible for guests to see the price list clearly.

4. Be careful about the installation location

Don’t be stupid and install it on the south wall! The sun track is low on the plateau, so it is installed in​ ​Northeast facing wall​ ​On the contrary, it is more conspicuous. Remember to set aside​ ​heat dissipation channel​​：

• The box should be at least 15cm away from the wall
• Install an awning on the top (don’t stick it too close to affect heat dissipation)
• Reserve drainage holes at the bottom (melted snow will pour back in)

Last year, there was a shop next to Songzanlin Temple. The screen was installed under the eaves of glazed tiles. As a result, the reflected light made the Buddha statue look green, so it was forced to be demolished by the management committee.

5. Questions you definitely want to ask

​​Q: Does the screen need to be turned off every day? ​ ​
A: Never! The temperature difference in the plateau is large, and frequent switching on and off will damage the components. It is recommended to keep it in winter​ ​Normally on standby mode​ ​, shut down for no more than 2 hours a day in summer.

​​Q: How to prevent snow accumulation when it snows? ​ ​
A: Pretend​ ​Intelligent heating film​ ​(Power consumption ≤0.3 degrees per hour), automatically starts when the temperature is lower than -5℃. Don't scrape hard with a shovel, as it will scratch the surface coating.

​​Q: What should I do if a yak rubs against the screen? ​ ​
A: This is true! Buried around when installing the screen​ ​Anti-collision pile​ ​, with a height of about 1.2 meters, it does not affect the field of vision and prevents animal damage.

I recently had a drink with my brother who is an engineer, and he revealed an inside story: 70% of the so-called "plateau-specific screens" on the market in Diqing are ordinary products with rebranded labels. Next time you make a purchase, ask the seller for a live demonstration.​ ​72 hours of continuous stress testing​ ​, broadcasting time-lapse video of snowy mountains - real gold is not afraid of fire, and a good screen can withstand the tossing! (I heard that serious manufacturers dare to sign a three-year UV color protection agreement, and if the color fades more than 30%, it will be replaced directly with a new one)

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