Are you also worried? It is clear that Taobao found a few hundred yuan per square meter LED scrolling screen, and asked how many companies quoted it from 2,000 to 8,000? What’s even more annoying is that some screens are stuck in words and broken codes after less than half a year of use, and the repair fee is even more expensive than buying a new one? Today we will open up our industry underwear and talk about the tricks here.

▍​​The truth behind the price fog​​
Last month, I helped my friend see the recruitment screen at the factory entrance. Supplier A quoted 3,200 and said "imported chips", while Supplier B offered 5,800 and said "military quality". After taking apart the samples, I found that both families used the same domestic driver IC. The four major kings that really affect the price are actually:
• ​​Lamp bead packaging process​ ​(SMD is 15% more expensive than direct DIP)
• ​​Control system version​ ​(It is 20% more expensive to be able to connect to USB flash drives than to update the stand-alone version)
• ​​Box material​ ​(Die cast aluminum is 30% more expensive than iron sheet)
• ​​After-sales commitment​ ​(2 years of full insurance is 25% more expensive than one year of light beads)

▍​​These parameters must be checked in person​​
The most tricky case I have ever seen: The merchant boasted about the P10 high-definition screen, and the actual dot spacing is 11.5mm to impersonate the P10. Teach you three tricks to inspect goods on the spot:

1. The vernier caliper with handle measures the center distance of adjacent lamp beads (true P10=10mm±0.3)
2. Use a white picture to test brightness uniformity (the brightness difference between the four corners and the center is ≤15%)
3. Scroll the numbers continuously for 8 hours (observe whether there are any lags or frame drops)
   Last year, a chain of pharmacies was cheated. There were 13 vertical hidden belts on 20 screens. Finally, it was discovered that the driver board cut corners.

▍​​Purchase and avoid pit comparison table​​

▍​​Hidden killing opportunities during the installation process​​
Don’t think that everything will be fine after buying the screen! Last week, a supermarket owner cried to me that the installed rolling screen was demolished by the urban management the next day - it turned out that the supplier did not make it​ ​Wind resistance report​ ​. The formal process should be:

1. Structural calculation book (wind load is based on the local 50-year standard)
2. The depth of the embedded part ≥ 1/10 of the screen height
3. Ground resistance ≤4Ω (must be done for lightning protection)
   A certain industrial park in Jiangsu did the third item because it missed, and directly smashed 6 screens during the thunderstorm season.

▍​​After-sales guarantee depends on actual combat​​
A ruthless trick to teach you: Ask the supplier for the last three months​ ​Maintenance work order record​ ​. The manufacturer who is really brave enough to give is absolutely reliable. From these data, we can see that:
• Average fault response time (>4 hours direct pass)
• High-frequency fault point distribution (beware of power supply problems that exceed 30%)
• Accessories replacement cost (more than 15% of the total price of the drive board will be abolished)

Editor's opinion: Buying an LED scrolling screen is like buying a used car. Don't believe in promotional pictures. You must go to the factory to see the assembly line. Focus on aging workshops - serious manufacturers have to test the machine continuously for 48 hours on each screen. Those who say "spot shipments" mostly skip the quality inspection process. Remember, sellers who dare to let you shoot production videos casually usually have less quality.

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