1. Three tests that must be done before buying a screen

Recently, a friend bought an outdoor screen that he spent 80,000 yuan. He always stuttered when broadcasting videos. Later, he found that the refresh rate was only 960Hz. This statement​ ​Parameter authenticity verification​ ​More important than bargaining. It is recommended to bring these three tools:

• ​​Optical tester​ ​: Whether the actual brightness meets the standard (withindoor not exceeding 1200nit)
• ​​Slow motion mode of mobile phone​ ​: Check whether there is a scanning line for refresh rate above 1920Hz
• ​​Thermal gun​ ​: After working for 1 hour, the surface temperature exceeds 55℃ and there is a hidden danger

The actual measured data shows that the false standard rate of product parameters in non-standard channels is as high as 62%, while the formal channel is controlled within 3%.

Comparison of advantages and disadvantages of the second and third major procurement channels

Last year, we surveyed 300 procurement cases and compiled this comparison table:

Key reminder: When you encounter people who say "the lowest price on the entire network", you should be vigilant. Last year, the industry spot check found that 87% of this type of product use second-hand lamp beads. remember​ ​Requires viewing of factory inspection report​ ​, focus on whether the grayscale transition test chart is smooth.

3. Special scenario procurement secrets

The pitfalls I stepped on when helping a bar choose a floor tiles on the dance floor:

1. Inadequate load bearing: dark areas appear in three months of dancing
2. Waterproof false mark: the wine seeps into the burning control card
3. The splicing seam is obvious: the video is always worn

Later, it was only possible to solve the problem by replacing the box with honeycomb aluminum structure. The key is:

• ​​Protection level​ ​: At least IP65 certification (see certificate number)
• ​​Box joints​ ​: Controlled within 0.1mm
• ​​Heat dissipation design​ ​: Dual-channel heat dissipation is 3 times longer than single-channel heat dissipation

4. Six-step method for expert machine inspection

1. Play gradient grayscale diagram continuously for 4 hours on the computer
2. Touch the temperature difference between each box with the back of your hand (there is a problem if it exceeds 3℃)
3. Use banknotes to cross the splicing seam (blocking means insufficient accuracy)
4. Check the signal interface type (at least 3 input interfaces)
5. Requires demonstration of automatic brightness adjustment function (response speed <0.5 seconds)
6. Check the CE/CCC certification code on the packaging box

Last year, a market sampling inspection found that the three-year failure rate of the display screen that passed these six steps was 78% lower than that of the untested ones.

When buying LED screens, don’t believe the nonsense of “price butcher”. I have seen too many cases where I saved a small amount of money and lost a lot of money - there is a shopping mall that bought a cheap screen, and the later maintenance fee is enough to buy two new machines. remember​ ​Procurement costs only account for 35% of the entire life cycle cost​ ​, the rest are the operation and maintenance costs that you cannot see. Next time you choose a supplier, ask them if they dare to sign a performance bet agreement.

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