​​"The LED screen I just bought was smoked when it was powered on, and 30,000 yuan was wasted! "​ ​ Last week, Lao Wang beat his chest and stamped his feet, reminded me of the fear of being dominated by the power supply settings when I first entered the industry. In this industry for eight years, I have seen too many newbies in power configuration——​ ​The black box hidden in the interlayer of aluminum profiles is even more eye-catching than finding a partner.​​。

1. Three major hiding rules for power storage

​​Core pain points​​: 70% of installation accidents are caused by finding the wrong power bank location.
​​Practical experience​​：

1. ​​Look for the lower right corner of the outdoor large screen​​: Standing facing the screen, there is a metal cover with a heat dissipation hole at half a meter high on the right side
2. ​​Rental screen to see box joints​​: Quickly disassembled aluminum-magnesium-zinc box, the snap-on cover is usually labeled with the "high pressure hazard"
3. ​​Transparent screen power supply module​​: Transparent screen with a transmissibility of more than 86%, the power bank will be disguised as a black decorative strip

​​Blood and tears case​​: Last year, a shopping mall installed a curved advertising screen. Five electricians searched for a power bank for two hours and finally found it hidden in the rain cover at the turning point of the curved surface - this tells us,​​The industrial design of the display is much more advanced than hide and seek​​。

2. Five life and death lines for power connection operation

Alas, there is a key point here to knock on the blackboard! ​ ​Don't mess with 220V and 5V​​, if the wrong wire is connected, the board will be burned at a light level, and if the worst is, the fire will be caused:

1. ​​Phase detection​​: Use a test pen to poke the terminal. The red light is on the live wire (don’t believe in the color mark, the manufacturer will sometimes make mistakes)
2. ​​Voltage regulation​​: The outdoor screen is adjusted to 4.8V-5.1V, and the indoor movable screen is recommended to 4.5V-4.8V (brightness decreases by 20%, life span is extended by 3 times)
3. ​​Line diameter selection​​：
   • 4mm² copper core wire for screens below 10㎡
   • 50㎡ large screen must be equipped with 16mm² wire (don’t worry about money, the cable will melt through the insulation layer when it heats up)
4. ​​Earthing metaphysics​​: Use the multimeter grounding resistor, >4Ω and wait for lightning to be struck
5. ​​Anti-dust design​​: Red is connected to V+, black is connected to V-, but encountering non-standard lines? First, turn off the power and then lick it with your tongue - kidding! After measuring the voltage, operate

Guess what? The ball curtain at the exhibition center burned last month because workers regarded the two-color line as red and black line. So,​ ​Don't believe in any color, just the instrument data​​。

3. Invisible battlefield for environmental adaptation

​​Temperature​​：

• Preheat before starting at minus 20℃: turn on 50% brightness for half an hour, wait until the power module temperature rises above 5℃
• 40℃ high temperatures should be reduced: every time 5℃ increase, the voltage will be reduced by 0.1V (for example, when 40℃ outdoors, the 5V power supply should be adjusted to 4.7V)

​​Humidity​​：

• The southern plum rainy season will be powered on for 2 hours a day, otherwise the PCB board will have "white hair" (not Ganoderma lucidum! It's copper oxide)
• The screen is discharged before touching the drying day in the north: the human body's static energy reaches 15kV, which is enough to breakdown the driver IC

​​True story​​: The screen of a certain stadium fence is always black, and finally it is found that the water mist formed by the sprinkler truck every day is conductive - so,​​No matter how high the waterproof level is, it is afraid of artificial rainfall​​。

4. Black technology of smart power supply

Now that high-end screens are all used for smart power distribution, these functions are just a waste:

1. ​​Off-peak power supply​​: Set automatic sleep at 2-5 a.m. to save 30% of electricity bills
2. ​​Fault Prediction​​: The power module temperature exceeds 60℃ and automatically lowers load, which is much more reliable than burnt smell alarm
3. ​​Electricity metering​​: Mobile APP checks the power consumption per square meter in real time, and no longer fears property charges randomly

A brother from the hotel engineering department told me that since he used the smart power system, the monthly electricity bill has dropped from 8,000 to 5,000 yuan.——​​The money saved is enough to install air conditioning in the duty room​​。

5. Self-examination and self-study first aid kit

When encountering power problems, remember these three tricks to save your life:

1. ​​smell​​: Which box does the burnt smell emit? 80% of the problem lies in the power supply closest to the smell
2. ​​touch​​: After five minutes of power outage, touch the heat sink. Modules with abnormal temperature must be replaced
3. ​​look​​: The LED indicator light flashes rapidly, the voltage is unstable, and the slow flashes are communication faults. If it is always on and off, the fuse may be hung.

Last week, I helped my friend repair the stage floor tiles screen, and I found the faulty power supply by touching the temperature.——​​Sometimes the original method works better than the instrument​​。

​​Editor's opinion​​
Power settings are like falling in love——​ ​Knowing the other party's minefield is more important than giving gifts​​. Next time you encounter power-up, don’t rush to smash the equipment first. Touch the display frame to find the metal box with a heat dissipation hole. Remember, there should be a slight beeping sound in the power bank when power is on. If it is quiet, it should be called after-sales service.

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