Have you ever encountered this situation? The big screen on the stage suddenly became half-black, and the technician was so anxious that he was sweating profusely and shouted, "The receiving card is out of power!" "Last year, I saw a shopping mall’s New Year’s Eve event crashing - an electrician connected the power supply of the receiving card to the air conditioner line, and the screen flashed with the rhythm of the central air conditioner. The scene was even more exciting than a disco! Today we will break it apart, it's deadly​ ​How to connect the power supply of the receiving card​​？

1. Three major tragedy scenes that connected the wrong power supply

Let me remind you first. If the power supply of the receiving card is connected by randomly, you can experience what "heartbeat acceleration" is in minutes:

1. ​​Unstable voltage​​: The card with a 5V mark is clearly marked, but it is not connected to the 12V power supply, and the chip directly emits smoke (don't laugh! Some newbies have done this)
2. ​​Common ground interference​​: Share the neutral line with the audio equipment, the screen jitters with the rhythm of the Bass, and DJs don't need to play DJs
3. ​​Phase inverted​​: This happened at a music festival three years ago. More than 30 LED floor tiles screen receiving cards were burned, and the maintenance fee was enough to buy a car

​​Lessons of blood and tears​​: Last month, I helped my friend repair the transparent screen in the bar and found that the receiving card was actually connected behind the dimmer. The voltage is insufficient during the day and the display is incomplete, and the current is overloaded at night and the wiring method is simply a textbook-level negative case!

2. Five-step tips for correct wiring

Remember this rumor:"​​Check the voltage of the marking and identification line, and ensure safety in independent circuits​​"

1. ​​View the tag​​: There are power signs in the upper right corner of the receiving card. There are three common types: 5V/12V/48V. It’s the same principle that mobile phone chargers cannot be mixed.
2. ​​Polarity​​: Red is connected to V+, black is connected to V-, and blue/yellow is the grounding wire (if it is connected in reverse, it will immediately smell burnt! )
3. ​​Testing the no-load​​: Take the multimeter output voltage, and the allowable error is ±5% (for example, nominal 5V, between 4.75-5.25V is considered normal)
4. ​​Independent power supply​​: You must pull the dedicated line from the distribution box separately, and do not compete with the motor and audio
5. ​​Anti-dust design​​: The regular power connector has snaps, but it cannot be inserted in if it is reversed (Warriors who are violently plugged in, please accept my knees)

3. Wiring solutions for different scenarios

​​Key reminder​​: Encounter with​​Intelligent brightness adjustment​​Remember to install the voltage regulator for the receiving card! At a brand press conference last year, when the screen automatically illuminates with the ambient light, the current fluctuation directly kills the receiver card.

4. Must check after wiring

Don’t rush to turn on the computer after connecting the cable. These three steps can avoid 90% of accidents:

1. ​​Nose smell​​: Get close to it within 10 seconds of power-on and smell it if there is a burning smell of plastic (don't be afraid of embarrassing, safety first)
2. ​​Hand back test​​: Quickly touch the surface of the power module, the normal temperature is slightly hot, and the power is immediately cut off when you are hot
3. ​​Look at the lights​​: There will be two indicator lights for normal receiving cards, green is always on and red is flashing.

​​Real cases​​: The most outrageous way to connect the network cable to power it - 8 network cables are connected in parallel as power cables, and the transmission data and power supply interfere with each other, and the snowflakes on the screen are so big that they can play a ghost movie!

Editor's opinion

After working on the display for so many years, I found​​Whether the power supply is connected directly determines the life of the screen​​. A truly reliable manufacturer considers power management from the design stage: for example​ ​Common Yin drive technology​​Save 30% of power, or install the receiving card​​Overvoltage and overcurrent protection chip​​. Some high-end models can even monitor the voltage fluctuations of each receiving card in real time through the mobile APP, which is really worry-free!

Next time I encounter a power wiring problem, remember these three truths:"​​Dedicated line test three times, lightning protection, stupidity protection, and hand care​​". After all, whether the screen is lit or not depends on whether the power is given enough stability!

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