Do you guys often encounter this situation - the LED screen suddenly has a black face, and the electrician changes the power supply when he comes? This thing looks inconspicuous, but it actually hides great knowledge. Last week, I just heard that a shopping mall event had half of the large screen strike. I found that the power supply was overloaded and the deposit was directly lost to 200,000 yuan. Today I will take you to take a look at the power supply.

▌The mystery of power hiding
Although the LED screen surface is bright, the real life gate is hidden in three places:

1. ​​Case back mezzanine​ ​: Like the battery compartment of a smartphone, the main power module is hidden here
2. ​​Receive card side​ ​: Miniaturized power supply responsible for powering the signal processing chip
3. ​​Dark grid at the bottom of the lamp board​ ​: A miniature driver that powers each pixel point

For example, the outdoor large screen in shopping malls has the main power module as big as a microwave. A few days ago, an old screen was removed, and the power supply inside was actually dissipated with a fan. It almost turned into a stove after three years of dust. Now the new smart power supply has its own temperature control, and the temperature exceeds 60℃ will automatically reduce the power and save life.

▌Choosing a power supply is like picking a heart
There are three levels of power supply on the market, and the price difference is three times:

• ​​Bronze grade​ ​: Industrial frequency transformer + aluminum shell, heavy enough to be used as a dumbbell, and the electricity bill will burn 40% more
• ​​Silver level​ ​: High frequency switching power supply, with overload protection, life span of three years
• ​​King level​ ​: Digital power chip, can play intelligent dialogue with the display screen, and automatically adjust voltage

The key point is here! ​ ​Recognize 80PLUS Bronze Certification​ ​Although the power supply is 200 yuan, it can save back the electricity bill in two years. A supermarket owner listened to advice and changed the energy-saving power supply, and the monthly electricity bill dropped from 3,800 to 2,200, making him laugh.

▌Four-step method for self-test power supply
Don't rush to ask for repairs when you encounter a black screen. Do these actions first:

1. Touch the temperature of the power supply case (it is dangerous if it is hot > 60℃)
2. Listen to whether there is an electric current sound (the sizzling sound indicates aging of the capacitor)
3. Look at the color of the indicator light (green is normal, red is required to alarm)
4. Does it smell burnt (if there is any, the power will be cut off immediately)

At a concert last year, technicians used these four tricks to troubleshoot power failure in ten minutes to avoid a performance accident. remember,​ ​Power failure accounts for 67% of the entire screen failure​ ​, choosing the right power supply is equivalent to buying insurance.

▌Exclusive data
The 2024 industry report shows:

• The average life of the screen using a counterfeit power supply is shortened by 3.8 years
• Smart power supplies can reduce maintenance costs by 55%
• Night mode power supply can save 70%

Remember to ask the power brand clearly when purchasing next time. The real guy is the one who dares to promise a five-year warranty. Just like when buying an electric car, you have to look at the battery, and when choosing an LED screen, you have to focus on the quality of the power supply. I heard that some manufacturers have now developed solar-powered outdoor screens that can provide self-sufficient power on sunny days. If this technology is popularized, the electricity bill can be cut in half!

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