Boss Zhang, who is new to the industry, has been very worried recently - he wanted to install a large screen in a new shopping mall. He asked three suppliers for quotations that differed by hundreds of thousands. Some said that second-hand equipment was a good deal, while others recommended online purchasing. How deep is the water in this line? Last month, a restaurant chain fell into a trap. The maintenance fee for the display screen it purchased for half a year was higher than the purchase price...

​​Where is the fee black hole hidden? Calculate purchase costs in three accounts​ ​
Newbies are most likely to ignore these three money-burning links:

1. ​​Hidden shipping charges​ ​: Special vehicles are required to transport a full screen over 2 meters high, and the freight may soar three times.
2. ​​Installation surcharge​ ​: The rental fee for aerial work vehicles is 800 yuan/hour, and a design fee will be charged for special-shaped installations.
3. ​​five years electricity bill​ ​: For an outdoor screen with a brightness of 5000cd/m², the electricity bill will exceed 200 yuan if it is turned on for 12 hours a day.

There is some interesting comparative data:

Last year, a gym saved a small amount of RMB 100,000 to buy a low-priced screen. As a result, the power system was replaced three times in two years, and the maintenance cost was RMB 150,000. This is a loss no matter how you calculate it!

​​Is online shopping really delicious? Beware of these five traps​ ​
Nowadays, many people are looking for suppliers on e-commerce platforms, but you must understand these key points:

• Look at the production cycle: genuine manufacturers can deliver goods within 15 days, but the bad ones will take at least 30 days.
• Check the certification code: The ISO9001 certificate number can be verified on the official website, don’t trust PS pictures
• Measure the heat dissipation design: take a thermal imager to take a picture of the sample, don’t consider it if the temperature difference exceeds 8℃

I'll teach you a trick - to​ ​Boxing video​ ​. Regular manufacturers will record screen lighting test videos before shipment, and even clearly show how the packaging anti-collision strips are attached. A client of a hotel chain relied on this trick to avoid the pitfalls of second-hand refurbished screens.

​​Pay attention to these three details during installation acceptance​​
Don’t think that everything will be fine once the goods arrive. These three acceptance actions cannot be omitted:
① Grayscale test: Check with 256-level grayscale image. If there is any level skipping phenomenon, return it immediately.
② Seam measurement: Use a feeler gauge to check the cabinet gap. If it exceeds 0.5mm, it must be re-levelled.
③ Brightness balance: Use a illuminance meter to measure the four corners and the center point. If the difference exceeds 15%, the correction must be redone.

A certain shopping mall suffered a hidden loss - it did not check the direction of the heat dissipation holes during the acceptance inspection, and as a result, water entered and short-circuited during the rainy season. Nowadays, all high-end screens have​ ​Intelligent temperature control system​ ​, can automatically adjust the fan speed according to the ambient temperature. This design can extend the life of the screen by at least 3 years.

Recently, a new trend has emerged in the industry: requiring suppliers to provide​ ​Light Pollution Assessment Report​ ​. Especially if it is installed near a residential area, you must calculate the night mode brightness value, otherwise you will have to dismantle and reinstall it if you get a complaint. I heard that one manufacturer’s outdoor screen can automatically sense ambient light and adjust the brightness, automatically dropping to below 300cd/m² in the middle of the night. This design is really considerate.

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