You must have seen such a scene: There is always a series of mysterious numbers in the lower right corner of the giant screen in the mall atrium, and a few characters occasionally flash in the lower left corner of the highway billboard. These inconspicuous small marks are actually the "birth certificate" of the LED large screen. Today we will talk about how to find out the age secret of the screen like a detective solving a case.

A friend complained to me two days ago: "I spent 200,000 yuan to buy the screen. The merchant said it was the latest technology, but I saw the production record for 2019 in the control card..." This sounds so annoying, right? In fact, it is not as difficult as you imagine to distinguish the new and old screens. The key is to know​Three hidden dens​。

​​The first hiding place: inside the power box​
Squat down and touched the metal box behind the screen? The moment you open it, you will be surprised to dismantle the express delivery - the nameplate posted here is like an electronic product ID card. Focus on two sets of data:

• ​3-6th digit of SN code​Usually represents the year and month (for example, NS2312XXXX is December 2023)
• Letters in the module batch number (M stands for 2020, N is 2021, postponed according to the alphabet)
  I have a cold knowledge: the nameplate of the outdoor screen will be printed one more line​​IP protection level certification date​, this is more reliable than the production date.

​​The second clue: Control system background​
Press and hold the remote menu key for 5 seconds and you will enter Engineer mode. There is a treasure hidden in the "Device Information" column:

1. The firmware version of the driver IC (V2.18.07 represents the update in July 2018)
2. Screen time counter (more than 5000 times are basically three years old equipment)
3. Brightness attenuation curve (normal attenuation of 3%-5% per year)
   Last time I helped the gym boss check the equipment, I found that the screen marked for 2022 had only 82% of the actual brightness of the new product, which is obviously a poor inventory.

​​The third trick: look at the arrangement of lamp beads​
Take out your phone to take a picture and enlarge it, pay attention to the distribution pattern of pixels:

• Multi-purpose screens before 2018​Formal chips​, there are fine soldering points on the edge of the lamp bead
• In the past two yearsFlip chip​The surface is as flat as a mirror
• It's popular this yearCOB Package​No single lamp bead can be seen at all
  There is a simple analogy: just like the mobile phone screen evolved from a notch screen to a hole-punch screen, which can be distinguished by the naked eye from the generation of technology.

Speaking of this, there may be a slight question: "What if the merchant deliberately tampers with data?" I have encountered this. The nameplate of the rental screen at an exhibition last year said it was produced in 2023. When I opened it and found that the power cord was made of an old-fashioned plug - this detail cannot be faked. Teach you three tips to prevent pitfalls:

1. Check the degree of gray accumulation in the heat dissipation hole (the inner side of the aluminum alloy frame of the new screen should be mirrored)
2. Smell the smell of plastic parts (the new material has a faint resin fragrance, and the recycled material has a pungent smell)
3. Touch the flatness of the splicing seam (there will be burrs after multiple disassembly of old screens)

There is a very interesting case recently: the transparent screen bought by a commercial complex is the latest model this year. As a result, the customer found the 2019 anti-counterfeiting ink at the splicing point. This thing was like a fluorescent mark on a banknote, and it immediately appeared with a banknote inspection lamp. So,​Don’t just listen to sales bragging, find evidence like archaeologists​。

The editor thinks that looking at the screen is like falling in love, you can’t just look at the appearance. Some old equipment is well maintained and is more durable than new screens; on the other hand, some new screens use inferior materials and problems occur in half a year. The key is to look at the manufacturerQuality Inspection Systemand​Technical iteration capabilitiesJust like some manufacturers can achieve a monthly output of 10,000 square meters and have full inspection, this powerful product year is not the most critical. Next time you select the screen, remember to bring a flashlight and a magnifying glass, so that the merchants will not dare to fool you!

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