Lao Li, the owner of a newly opened convenience store, had a problem recently - the advertising screen he bought for 30,000 yuan went out of service after two months of use. When the maintenance technician took it apart, he found that the power module was actually refurbished with second-hand parts. This kind of bad thing is so common in the industry, today I will take you through it​ ​Tips for identifying reliable purchasing channels​​。

​​Lesson 1: Understand the word play in parameters​​
Many merchants mark "refresh rate 1920Hz" as the top priority, but hide the small print "theoretical value". Actual measurement data is reliable. Let me teach you how to detect soil:​ ​Capture the screen in slow motion mode on your phone​ ​, those who can clearly see the text scrolling trajectory are considered really good brushers. Last month, I tried this trick when I was helping a fast food restaurant choose a screen. The actual measurement of a machine with a nominal 3840Hz was only 1200Hz, and the picture was blurry as if it were mosaic.

Purchase channel comparison table:

​​The second move: a compulsory course for making secret visits to factories​​
Don't believe the "Wanping Factory" in the brochure, look at these three corners in person:

1. Aging test workshop (at least 48 hours of continuous baking)
2. Microscope magnification of the quality inspection station (solder joints can be inspected only after 100 times)
3. Spare parts warehouse inventory types (model accessories must be complete within three years)

Once when I accompanied a customer to inspect a factory, I discovered something fishy. In a workshop that is said to be an automated production facility, the die-bonding process is still done manually. For this kind of factory-made screen, the pixel dropout rate will be more than five times higher than the standard. remember​ ​The fully automated production line will have robotic arm tracks​ ​, There should be no scattered components on the assembly line floor.

​​What to do if you have a limited budget? ​ ​
It’s not impossible to buy second-hand screens, but you should check the following:

• After lighting up, listen closely to the power supply noise (choose carefully if the current sound exceeds 45 decibels)
• Use solid color pictures to check the consistency of lamp beads (color difference within 5% is allowed)
• Check the oxidation condition of the joints of the box (black color indicates excessive moisture)

Last year when I was renovating a gym, I found a treasure. I got a rental screen at a 20% discount. I replaced it with a new control system and turned it into a front desk information board. Here is a little trivia:​ ​The protective structure of rental screens is 30% stronger than commercial screens​ ​, especially suitable for transformation and reuse.

Now to answer the core question: "How to verify the identity of the supplier?" "These three documents are required:

1. Quality management system certification (with latest annual inspection seal)
2. Third-party testing report (including EMC electromagnetic compatibility data)
3. Past project case contracts (version with sensitive information hidden)

The purchasing manager of a restaurant chain shared a clever tip: Let the sales person make calls from the company's landline. Those who can immediately transfer the call to the technical department are the real manufacturers. Next time you go to inspect a supplier, why not suddenly ask to see​ ​Raw material storage order​ ​——Those who dare to show off on the spot are reliable players with sufficient confidence.

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