Does your LED billboard have black screens at any time? Are the shopping malls always losing track at critical moments? Don't rush to criticize the poor power supply quality first! I bet that 80% of the problem lies in the fact that you don’t understand the “fatal points” of the power system. Today I will take you to uncover the secrets in the power box, so that you will definitely become a "fault diagnosis expert" in your circle of friends.

▎TOP3 of the worst-hit areas of power failure
Let me give you a real case - the signature screen of Boss Wang, the convenience store downstairs, has been repaired three times in half a year. The master took a look:​ ​The cooling fan is blocked by cotton wool​​、​​Capacitors are bulging like pregnancy​​、​​The terminals burnt black​ ​. These three places are simply the "Three Deadly Musketeers" of the power supply system!

1. ​​Capacitive pregnancy syndrome​ ​: Touching the power supply case makes it hot? Quickly disassemble and see if the yellow cylinder (electrolytic capacitor) is bulging. This thing is like a balloon. It expands as soon as the temperature rises. If something happens to exceed 65℃, something will happen.
2. ​​Wiring port barbecue site​ ​: Especially for outdoor screens, if the copper nose is not tightened, the contact resistance will increase and the local high temperature will be burned into black carbon over time.
3. ​​Fan-to-vacuum cleaner​ ​: Some power supply designs are really anti-human. The air inlet is facing the ground and can absorb two taels of dust in half a year. Did you make it? The heat dissipation efficiency is reduced by 20%, and the power supply life is cut by half

▎How many of these mortal actions have you won?
When I was inspecting a shopping mall last month, I found these tricks that their electricians did:

• Connect the ordinary wire to the outdoor screen (at least 4 square millimeters of copper core wire)
• Switch the power box into the sealed iron cabinet (the heat dissipation hole is smaller than the needle hole)
• Different batches of power supply modules are used in mixed use (new and old power supplies will compete with each other)

The most amazing thing is that there is a KTV boss who insists on stacking beer boxes on the power box. As a result, condensate water flows into the box and short-circuits the entire row of modules. So,​ ​The 30cm perimeter of the power box must be cleared​ ​, this is no joke.

▎Three life-saving moves to extend power supply life
Recite the formula with me: one look, two touch three records

1. per month​ ​Take a look without the box​ ​Capacitor status (remember to turn off the power first! )
2. After shutdown​ ​Touch the temperature of the shell​ ​, if you feel hot, you have to take measures to reduce the temperature
3. ​​Use an electric pen to measure voltage fluctuations​ ​, record the peak voltage every day

There is a ruthless Internet cafe owner who is even more amazing, and installed the power box.​ ​Intelligent temperature control socket​ ​, power outage automatically if it exceeds 55℃. Although I spent 800 yuan on the early stage, I had not replaced the power module in three years, saving a small amount of 20,000 yuan in repair costs.

▎How deep is the repair water?
Recently, I found a strange fault in the gym: the newly replaced power module exploded in half a month. I found that it was used​ ​Refurbished capacitors​ ​, the surface was remarked. I will teach you a trick - the explosion-proof pattern on the top of the genuine capacitor is a regular cross or Y-shaped character. The counterfeit goods either have no patterns or are carved in a crooked manner.

Now those who know how to do it are specified​ ​Glue filling power supply​ ​, is the kind of soaking the components in jelly-like colloid. Don't think it's expensive. This design allows the power supply to work as usual on heavy rainy days, and the protection level is directly increased to IP67, which is more than three times more resistant to ordinary power supply.

Editor's opinion: Next time the power supply strikes, don't rush to scold the streets. Bring a strong light flashlight and a multimeter, check these three places as I said, so that the repairman will not dare to make random quotes. Remember, the good father is the one who knows how to check himself!

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