A friend who runs a bar complained to me two days ago: "I bought a rotary screen for 200,000 yuan. I found that it turned out like an electric fan at night. Is this money wasted?" This is really not uncommon - now people sell LED rotary screens all over the street, but which channels are reliable? Today we will break up and chat.

(Knock on the blackboard) First draw the key points:​You must seize three life gates when buying a rotating screen - the channels are formal, the manufacturers have foundation, and the after-sales service are guaranteed.​. Just like buying a house, you need to look at the developer's qualifications. You must also learn to check the "foundation" when choosing a display screen.

​​Level 1: Recognize the depth of the sales channel and shallow water​

Now buying a rotary screen is like ordering takeaway, and you can place an order on any platform. But you have to know the depth of water from different channels:

To give a real case: Last year, a music festival used to quickly disassemble and assemble the rotary screen. When purchasing, I specifically asked to read the manufacturer's monthly production capacity report - good guy, the monthly production line of the automation production line exceeded 10,000 square meters. Only such a powerful person dared to take on large-scale performance projects. In contrast, those small workshops can’t even produce real-life videos from the production workshop.

​Level 2: Understand technical parameters without paying IQ tax​

Some sales blow P5-pitch screens into "4K HD", which is as outrageous as calling a tractor a supercar. Remember these key data:

• ​​Refresh rate ≥1920Hz​​: When the number is lower than this, it will drag the shadow, and the fast-paced picture will be blurred into a mosaic
• ​​Brightness grading adjustment​: The stage needs to start with 4000cd/m², and the indoor shopping mall 1200cd/m² is enough
• ​​Protection level IP65​​: If you don’t have this certification for outdoor use, you will become a sprinkler device as you turn it.
• ​​Case material​: Only aviation-grade aluminum-magnesium alloy can withstand high-frequency rotation, and the plastic frame is completely disintegrated in three months

Last year, the rotating floor tiles screen installed in a shopping mall atrium suffered a loss - the screen I bought was only 1440Hz refresh rate, and the screen delayed by half a second when the customer stepped on it, and finally he could only be used as ordinary floor tiles.

​​The third level: The manufacturer's details need to be checked to the sky​

Regular manufacturers dare to show you the truth and teach you three ways to verify your true self:

1. ​Check certification​: ISO9001 is the basic threshold, CE certification represents compliance with international standards, CCC is a domestic compulsory certification
2. ​​Depending on the production scale​​: Manufacturers with monthly production capacity less than 5,000 square meters are probably OEMs
3. ​Ask about the warranty terms​: Those who dare to promise a three-year warranty for the whole machine are really reliable. Those who say "lifelong maintenance" are mostly ready to run away

Here is a tip - ask the manufacturer to post a workshop video. A truly powerful production line must have professional equipment such as SMT patch machines and wave soldering. Just like a restaurant must have a kitchen. You can’t use an induction cooker to make a Manchu-Han banquet, right?

​​The fourth level: After-sales service is the touchstone​

All serious manufacturers dare to write after-sales terms into the contract, such as:

• Respond to faults 24 hours a day
• Provide five years of spare parts
• Free upgrade of software system for life
• On-site inspection every quarter

On the other hand, those who play word games have the contract that says "lifelong maintenance". If you look closely, you will find that you have to pay for your own travel expenses + accessories fees, which is more expensive than buying a new screen. Just like the "lifetime card" of some barber shops, it sounds like the beauty is actually a pitfall.

​Personal experience of blood and tears​

I have seen too many magical operations over the years: some use rental screens to impersonate engineering screens, some use indoor screens as outdoor devices, and even sell 2015 inventory machines as new products. After all, remember three sentences when choosing a rotating screen:

1. ​​After checking the certification, paying a deposit​
2. ​​See the factory and sign the contract​
3. ​Try the prototype and buy it in batches​

Finally, let me tell you a cold knowledge: the drive motors of high-end rotary screens are all military-grade, and you will definitely not find such details in second-hand goods. So, don’t try to get cheaper when buying this thing, as the money saved is not enough for later repairs. If I ask, choose a manufacturer with an automated production base of over 10,000 square meters and a monthly production capacity of over 10,000 yuan, at least you can sleep in a stable area, right?

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