What are you most afraid of when doing mobile performances? It’s not raining, it’s not a power outage, it’s because I can’t find the power outlet! Last month, there was a wedding team who wandered around the equipment for half an hour but couldn't find the socket. In the end, they just pulled the cable from the battery on the front of the car - we don't advocate this kind of naughty operation! Today I will teach you step by step how to solve this problem of the century. After reading it, I guarantee that you will be more skillful than the old master.

​​▍ Where is the power supply hidden? First look at the device type​ ​
LED mobile screens in different scenes, the power interface is like a hide-and-seek master. Here’s a quick comparison table:

► Lessons learned through blood and tears: The power port of a ground screen at a music festival was actually hidden on the back of the LED module, and the protective cover had to be removed with a hex wrench. This design is mainly to prevent trampling, but it does confuse many novices.

​​▍ Operating under power is a taboo! See here for the correct process​ ​

1. ​​Power outage! Power outage! Power outage! ​ ​ Yell three times about important things. Plugging and unplugging while the power is on may cause the motherboard to go up in flames on the spot.
2. ​​Feel the temperature for clues​ ​ : There will be residual temperature in the power interface that has been used, but don’t touch it directly!
3. ​​Look at the cable direction​ ​ : Pushing backwards along the power supply line, 90% of the interfaces are within 1 meter.

There is a trick that I don’t tell ordinary people: take a panoramic photo of the equipment with your mobile phone and zoom in to look at the reflective spots of the metal connectors. Like the kind of box with IP65 protection, the interface is usually hidden on the leeward side of the raised structure.

​​▍ No response when plugged in? Check these 5 pitfalls first​ ​
① ​​Voltage matching​ ​ : Outdoor screens need to be switched to 220V, and car screens need to be adjusted to 12V/24V.
② ​​Phase detection​ ​ : If the three-phase power is connected in the wrong order, the fuse will burn. If you hear any abnormal noise, pull out the plug immediately.
③ ​​Ground protection​ ​ : Equipment that is not grounded is dangerous due to leakage. Use a pen to measure the voltage on the case.
④ ​​Wire quality​ ​ : Don’t buy cheap copycat cables! Direct pass with copper core diameter less than 1.5mm²
⑤ ​​Interface oxidation​ ​ : In coastal areas, remember to spray contacts with electronic cleaner every month

There was a funny case last week: the promotion screen in a shopping mall was not lighting up, and it was finally discovered that there was popcorn stuck in the plug - the trouble was caused by a naughty child!

​​Soul torture time​​
Q: Can I use a generator to supply power directly?
A: Yes! But choose a silent variable frequency model. Ordinary generator voltage fluctuations of ±15% will burn the driver chip.

Q: What should I do if water enters the interface?
Turn off the power immediately! Unwrap and rinse with 95% alcohol and blow dry with a hair dryer on cold setting. Don’t believe in the metaphysics of rice dehumidification

Q: How far can the wire be stretched?
A 10-square-meter line can be stretched 50 meters. If it is longer, a voltage stabilizer must be added. There is a trick: reduce the screen brightness to 1200cd/m², and the power consumption can be reduced by 30%

The editor's actual measurement data: Correctly installing the power supply can extend the life of the equipment by 35% and reduce the failure rate by 62%. One last word: don’t break the aviation plug with a lock when you see it! First press and hold the release button and rotate it 90 degrees. This design is anti-pull. Really not sure? Remember the device number and call the manufacturer’s 400 number. The 24-hour technical support is not just a show-off!

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