Why! Last month, I helped my friend repair the LED large screen, and I was stunned when I opened the back cover-​—​​The power cord is wrapped into a spider web, the heat sink is so hot that it can be fried eggs, and the fuse is replaced by copper wire.​...Today we will talk about this most deadly but always overlooked component:Where should the LED screen power supply be placed? How to choose not to burn the screen?​​

1. Three taboos in power hiding places

You may be confused:​"Isn't it just an iron box? Can't you just put it anywhere?"​
Don't think so! Last year, a screen in a shopping mall caught fire, but in the end, the power supply position was not correct:

​​Don't kill the three​：

1. ​​Don't stuff it into the enclosed box​: The power supply operating temperature exceeds 60℃ will reduce life, and the heat dissipation space will be 20cm
2. ​​Don't install it on the wall​: Leave at least 5cm of space, otherwise the wet days will be short-circuited in minutes
3. ​​Don't get close to the signal line​: Electromagnetic interference will cause snow patterns on the screen, keeping a distance of more than 30cm

​Test tips​: After turning on the power supply case for half an hour, touching the power supply case. If you feel it is hot (over 50℃), you have to move your position quickly!

2. Five hard indicators of good power supply

Here is a recipe for selecting industry masters:

​​Two points to focus on​：
✅ The shell must have heat dissipation fins (the light plate and iron shell are all hooligans)
✅ The interface must be gold-plated (the anti-oxidation life is extended by 3 times)

3. Lessons of blood and tears during installation

▍The wiring sequence is wrong and ruins the full screen

The correct steps should be:

1. Turn off the main gate first and then operate (don't laugh! Someone really has a live wiring)
2. Power output terminal connection screen body (red to red, black to black)
3. Finally connect the 220V input line (don't connect the zero live wire in reverse)

​​Real cases​: A newcomer from an event company connected the input and output in reverse, instantly burned 18 modules, and lost 26,000 yuan...

▍Thunder protection measures cannot be saved

Remember this formula:​The price of lightning protector = total screen price × 0.5%​

• 100,000 screen with 500 yuan lightning protection device
• Don't use the three-no lightning rod! Choose a belt10KV discharge capacityRegular goods

▍The parallel connection of multiple power supplies is very particular

When the screen exceeds 8 meters wide, you must pay attention to:

• The power difference between main and secondary power supply is ≤10%
• The wiring length difference is controlled within 3 meters
• Synchronous startup error <0.1 seconds

4. Death Trap during maintenance

​​I've been asked the most​: Can you repair it yourself if the power supply is broken?
By looking at the group comparison data, you will understand:

​​Lessons of blood and tears​​: An electrician used ordinary solder to repair the power board. After three months, the screen was blackened due to the false soldering, and the maintenance fee tripled!

Advice for veteran drivers

After ten years of hard work in the industry, we will summarize three iron laws:

1. ​Don't believe the nonsense of "putting the power supply position at will"​, poor heat dissipation can reduce the life of the power supply by 80%.
2. ​​ Must be tested before the rainy season​: Use a multimeter to measure the grounding resistance to <4Ω
3. ​​Two to four in the morningIt is the period of high-incidence of power supply failure (the period of maximum voltage fluctuation)

Finally, I'll tell you about the industry secret:​67% of LED screen failures in 2024 are caused by power supply problems​, and 90% of them could have been avoided. Remember - the power money saved will sooner or later become a repair order, and a reliable installation is more valuable than gold!

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