If a novice wants to buy an LED display, is it often dazzled by the promotion of "direct sales from manufacturers" and "ten-year warranty" on the web page? Last week, my cousin insisted on installing a large outdoor screen when he opened a store. However, when he bought it, the screen was black every few days, and the repair fee was almost up to the screen price. Let's talk about it today,​How to avoid those cheating sellers and find truly reliable partners​。

1. Look at these five hard indicators to screen inferior suppliers in seconds

​"Everyone says that their products are good, who should I believe in?"​
Let me tell you the truth - last year, a shopping mall bidding, 17 of the 28 suppliers could not provide a complete quality inspection report. Remember these hard-core screening methods:

1. ​​Flip the ID to check the household registration​：

   • CCC certification is required (new energy efficiency filing is added from 2023)
   • If there are many overseas orders, please refer to CE/FCC certification (the quality control of factories exported to Japan and South Korea is stricter)
   • ISO9001 quality system certification is the basic threshold

2. ​​Production workshop cloud supervisor​：
   All serious manufacturers dare to open video viewing factories, pay attention to observation:

   • Is the automated patch machine running at full capacity (don't consider hand-welded lamp beads)
   • Is the aging test time 72 hours long (only 24 hours if you cut corners)

3. ​​The trick hidden in the contract​：
   Focus on these two items:

   • Does the warranty period include the driver power supply (many merchants only protect the light beads)
   • After-sales response time is not written in specific hours (abnormal terms are all pitfalls)

2. Text games in technical parameters

​"Why do you think of P3 screens three times the price difference?"​
Last week, I encountered this when I helped my friend inspect the screen. The screen marked with P3 spacing was measured and the spacing between the lamp beads was 3.2 mm - there are so many ways here:

• ​Pixel density​: There are 1111111 lamp beads per square meter of P3 screen
• ​​Refresh rate is not easy​: 3840Hz is the driver IC frequency, and the actual screen refresh rate depends on the number of grayscale scans
• ​​Brightness Trap​: Outdoor screen mark 8000nit, but this is the peak brightness (actually, it can only reach 5000nit when it is always bright)

​Important reminder​: Ask the seller to issue a third-party inspection report, focusing on these two data:

1. Brightness uniformity ≥95%
2. Color gamut coverage ≥110%NTSC
   If the other party stammers and refuses to show it, change the next one!

3. Service ability is the touchstone

​"When there is no problem with the machine, you can't tell whether the supplier is reliable or not"​​
I heard the master say this at an industry exhibition and I deeply feel the same. Last year, a heavy rain caused 16 rental screens to be blacked out at a music festival. Reliable suppliers arrived with spare boxes in two hours - this kind of emergency response capability depends on:

• ​​Technical team size​: There must be at least 20 full-time engineers
• ​​Spare Parts Warehouse Distribution​: There must be more than 3 regional warehouses in the country (don’t believe in the nonsense of “unified headquarters allocation”)
• ​​Case shooting video​: Don’t just look at the renderings, there must be a real record of the installation process

A lesson learned from a bloody and tears: a scenic spot has a cheap picture and found a small workshop to buy screens. As a result, after the mountain collapsed and smashed the screen, the seller directly canceled the company and ran away. So,​Suppliers with registered capital less than 50 million should really think twice​。

4. Hidden cost behind price

​​"The quotation looks cheap, will it be slaughtered in the future?"​​
Let’s do the calculations for everyone: a company bought a batch of low-priced screens, and the result is within three years:

• 180,000 more electricity bills (power efficiency is only 83%)
• Repair suspension loss of 600,000
• Repurchase accessories and pay an extra 250,000 yuan
  This is a much loss than the 150,000 purchase fee saved at the beginning!

​Pit prevention guide​：

1. Ask for the power conversion efficiency (high-quality products ≥93%)
2. Confirm the material of the box (died cast aluminum box is more expensive than sheet metal box but has a three-fold longer life)
3. Calculate the total cost of five years (including electricity charge + maintenance charge + residual value)

5. My heartfelt advice

After eight years of industry observation, I found a rule: those who dare to use technical parameters as the homepage of the product manual are usually real people; those who brag about "imported chips" and "military quality" all day long are playing with concepts. Next time I encounter a supplier, I will ask these three questions directly:

1. Can the lamp bead brand and chip batch trace the origin?
2. Is there any measured data for the temperature rise curve of the driver IC?
3. Are there any cases of old customers that have been running for more than three years?

If the other party answers fluently and can take out a test report to prove it, such a partner is worthy of entrusting. Remember,​Looking for a supplier is like finding a partner. You can only cry after marriage.​。

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