Have you ever seen a commercial street at three in the morning? I've seen it - the last time I helped someone repair an LED advertising screen, six electricians rummaged through the control cabinet with flashlights, just to find that fist-sized switching power supply. What's even more shocking is that it was finally discovered that the decoration team had sealed it in the suspended ceiling with gypsum boards and demolished half of the wall before taking it out. The maintenance cost soared into five figures.

Three fatal operations at the installation location

Let me tell you a true story: A hot pot restaurant installed the switching power supply directly under the air outlet, and as a result, the power module was replaced three times in six months. Here is a reminder for newbies:

1. ​​Don’t be a Russian matryoshka doll​ ​: The switching power supply and the receiving card must be at least 30cm apart. The most outrageous thing I have ever seen is five layers of equipment.
2. ​​Waterproof does not mean moisture-proof​ ​: Equipment installed in the basement must be equipped with a dehumidification box. Humidity exceeding 70% will cause the capacitor to bulge as if pregnant.
3. ​​Space should be reserved for cooling​ ​: Leave 8cm of space on the top, bottom, left and right, just like when eating hot pot, you need to leave room for the pot to flop around.

When I visited the factory last week, the technician demonstrated a cool operation - flipping the switching power supply onto a bracket with heat sink fins. The actual measured temperature is 12°C lower than that of the original device, and the service life is extended by a full 18 months.

Four Catch-Rules for Correct Site Selection

After modifying more than 20 mobile screens for wedding companies, I came up with the golden formula:

• ​​Electromagnetic interference protection​ ​: At least 1.5 meters away from the inverter, like an old flashing screen in a supermarket. Finally, it was found that the problem was caused by the freezer compressor.
• ​​Shock buffering​ ​: Use a 3mm thick silicone shock-absorbing pad to prevent internal injuries during transportation.
• ​​Wiring convenience​ ​: Leave a 15cm margin of movement at the entrance and exit of the power cord. Don’t let the wire stretch straight like ramen noodles.
• ​​Maintenance visualization​ ​: Open a transparent observation window on the equipment box door, and the status of the fault light can be seen at a glance.

Actual measurement data shows that the installation bracket with intelligent temperature control can reduce the power module failure rate by 43%. A ruthless person installed a car turbine cooling fan on the power supply, and the standby temperature dropped to below 35°C.

Money-saving wild tricks

I heard that a shopping mall burned an entire row of modules and lost 80,000 yuan due to improper power installation. These tips can save your wallet:

1. ​​When purchasing​ ​: Choose a power supply with PFC correction function to save 15% on electricity bills
2. ​​When installing​ ​: A lightning protection module is installed at the input end, so you are not afraid of being struck by lightning during the rainy season.
3. ​​During maintenance​ ​: Scan with a thermal imager every quarter and deal with hot spots in advance

Here's something even more amazing: A technician put a color-changing temperature measurement sticker on the bottom of the power supply, which will automatically turn red and alarm when the temperature exceeds the standard. This home-made method is more sensitive than electronic sensors and costs only fifty cents.

Troubleshooting Practical Manual

The most mysterious malfunction I have ever encountered: the power supply is normal but the screen lights up and goes off. It was finally discovered that cockroaches had made their home in the terminal block. Frequently asked questions are dealt with as follows:

• ​​Power light flashes​ ​: First check whether the input voltage fluctuates by more than 10%.
• ​​Output voltage is unstable​ ​: Open the casing to see if the filter capacitor is pregnant.
• ​​Unusual beeps​ ​: Most likely the core of the transformer is loose. A drop of 502 glue can help.

There is a funny case: the newly installed screen goes black every noon. After checking for three days, I found that the power supply was overheated due to direct sunlight. Nowadays, old masters carry infrared thermometer guns with them.

The editor’s last words: Don’t believe the nonsense of “just pretending”. The most professional solution I have seen is to install a smoke alarm in the power supply compartment, which will automatically cut off the power if there is a fire. If you find one that can provide​ ​24-hour remote diagnosis​ ​For suppliers, remember to ask them to write the power parameters on the equipment nameplate when installing the equipment - this detail can save you three years of detours.

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