Have you ever encountered this situation? The big screen in the mall has just been installed for half a year, but the picture looks like it is covered with fog, red turns orange, and the human face looks like it has been soaked in water. Worse, some screens flash in winter and are so hot that they can fry eggs in summer. Alas, how is it more difficult to choose an LED splicing screen these days than finding a partner?

1. Text games in the parameter table

Many people look at the size and price when they get the product manual. In fact, there are great things hidden here. Last week, a boss who runs a hot pot restaurant complained to me that the P2.5 screen he bought couldn't see clearly at the kitchen door - guess what? The brightness of 5000cd/m² written on the parameter table is only 2800!

Here are three must-sees:
​​1. Actual brightness measurement value​ ​: Don’t beacon nominal value, you need to look at the “lasting 8-hour brightness” data of the third-party inspection report. The direct pass for outdoor screens below 4000cd/m²
​​2. Refresh rate ghost shadow​ ​: Take a video with your phone camera facing the white screen. If the black bar appears, it means that the refresh rate is insufficient. The live broadcast must be at least 3840Hz.
​​3. Protection level is irritating​ ​: IP65 is not life-long maintenance-free, it depends on the specific testing conditions. There was an Internet cafe owner who bought the "IP65 waterproof screen", but water still came in during the rainy season. When I opened it, I found that the seal strip was not tight at all.

To give a real example: a chain supermarket changed three batches of screens before it understood that the screens in their seafood area had to be tested for additional salt spray, and ordinary IP65 could not withstand the moisture corrosion of the seafood market.

2. Hidden cost of installation site

Do you think it's all done after buying the screen? Too naive! The case in a government affairs hall last year was scary enough - it was found that the load-bearing beam was not enough during installation, and it cost 170,000 yuan to be temporarily reinforced. Remember these numbers:

• ​​Weight per square meter​ ​: Don’t believe what the manufacturer said is "about 35kg", it should be specific to the box material. The aluminum-magnesium alloy box is 40% lighter than the iron shell, but it is 2.3 times more expensive
• ​​Heat dissipation space​ ​: At least 80cm of the rear maintenance channel is left. In order to save space, a shopping mall only leaves 50cm, and the power supply is replaced three times in two years.
• ​​Spliced ​​seam compensation​ ​: Don’t save this money! A hospital installed less correction modules, causing the electrocardiogram to be disconnected, causing a major dispute

Here is a comparison table for your experience:

3. After-sales service mirror

Let me tell you an insider of the industry: the "24-hour response" promised by many manufacturers is actually to let the customer service girl chat with you. To really solve the problem, we have to look at these three hard indicators:
​​1. Spare Parts Library Radius​ ​: There must be a warehouse within 300 kilometers. The screen of a logistics center was damaged on Double Eleven last year and waited for spare parts for 11 days.
​​2. Fault prediction rate​ ​: A good system can be alerted to 85% of faults 7 days in advance. Don’t wait until the screen is black before repairing
​​3. Remodel compatibility​ ​: When you want to upgrade in three years, do you find that the old system is incompatible with the new module? There are too many things like this

There is a real lesson: a scenic spot bought a batch of cheap screens, but after five years, I wanted to expand it. The manufacturer had long stopped producing that model, and the entire system had to be replaced, which cost more than 2 million yuan.

The editor has been working hard in the industry for eight years and has seen too many people rush into traps. Finally, let’s say something heart-to-heart: Those "innovative technologies" that are so singular that they really need a test report. Focus on these two values:

• ​​MTBF (Average No Failure Time)​ ​: Those who are less than 50,000 hours are all hooligans
• ​​Humidity and heat cycle test​ ​: After 100 tests, the brightness attenuation cannot exceed 5%
  Last year, I found that there was a manufacturer who had a "100,000-hour life" and the actual test data was only 32,000 hours. Remember, buying screens is not buying groceries, and the money you save will be doubled sooner or later!

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