You said that the LED large screen is like a Transformer now, with more and more functions, but why is it so difficult to find the most basic power cord interface? Last week, I helped my friend's store install a display screen. Three big men wandered around the machine for half an hour but couldn't find the power connector. Finally, I found it hidden in the crack in the box - it was embarrassing to tell it! Today we will talk about this seemingly simple but crazy question.

The power connector hidden in the corner

To be honest, the current display design is becoming more and more hidden, just like playing hide-and-seek. There are three common power connection locations:

• ​​The groove area on the back of the box​​(Please check if there is a dust cover)
• ​​Between the module splicing seams​​(You have to use your nails to open the protective patch)
• ​​Next to the bottom heat dissipation hole​​(usually marked with a small lightning symbol)

You may not know about it if you have a cold knowledge——​​The power connector of the outdoor screen is often 5cm higher than that of the indoor screen​​, This is to prevent rainwater from pouring back. The most amazing design I have ever seen is that the power connector is hidden in the box clasp, and you have to disassemble the fixtures before you can see it.

Will the board burn if the wiring sequence is wrong?

Last year, there was a shop in Yiwu small commodity market. The boss connected the zero-fire wire in reverse when connecting the wires himself. As a result, he had a "bang" as soon as the power was turned on, and the repair cost was less than 20,000 yuan. Here is the key point:

1. ​​Close the main gate first and then operate​​(Don't bother)
2. ​​The wire color must be matched​​(Red connected to L pole, blue connected to N pole)
3. ​​Don't omit the grounding wire​​(The yellow and green two-color lines must be connected firmly)

Here is a tip: use a pen to test the interface.​​If the voltage fluctuates more than ±5%, do not force it​​80% of the problem with the distribution box. This is how a hot pot restaurant I helped to detect circuit aging problems, and timely handling them avoids greater losses.

How to connect multiple screens in series to safely?

The super large screens in the mall are actually spliced, but the power supply cannot be casually stringed. The case of a shopping mall opening last year was a lesson - they strung five screens on a line like hanging lanterns, but as a result, the voltage was unstable and three control cards were burned. The correct way to connect should be:

• ​​Each screen is lined separately​​Go to the distribution box
• ​​20% margin reserved for total power​​(For example, the total power consumption of 8000W on the screen should be 10000W)
• ​​Three-phase balanced distribution​​(Don't connect all screens to the same phase)

There is a data that may scare you:​​Parallel connection wire error rate is 67% lower than series connection​​, although it costs more wires, the safety factor is much higher. An exhibition hall project I handled, with 28 screens using independent lines, and a three-year failure rate.

The thickness of the wire is not right

Don’t think that you can buy the power cord at will, as there is a lot of knowledge here. Here is a practical comparison table for you:

I remember that last year I helped the Clothing City change the cables. After changing the original 1.5mm² cable to 4mm², the screen brightness stability was directly improved by two levels, and the electricity bill was saved by 8 percentage points.

Operations on rainy days are really fatal

If you have to work on rainy days when you are in the rainy day, remember that these three sets must not be missing:

1. ​​Insulated rubber shoes​​(Don't laugh, it can really help you)
2. ​​Waterproof junction box​​(Prepare fast-drying sealant in advance)
3. ​​Electrical tester​​(A gadget worth more than ten yuan is more reliable than eyes)

There is an abnormal operation:​​Wiring in the rain is safer than after the rain​​, because the air humidity is saturated, it is not easy to generate arcs. Of course, this is just an emergency plan in extreme cases, so it is best to wait until the sky is clear before doing it.

I want me to tell you, connecting the power cord is like falling in love, you have to be careful and patient. Now some new smart screens have begun to use wireless power supply technology, but our traditional wiring method will have to fight the world for a long time. Next time, if you can't find the power connector, don't rush to scold the manufacturer for designing anti-humanity. Maybe they are hiding some black technology considerations. Remember, safety is always the first place. After all, the maintenance costs saved are enough to buy several new screens, right?

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