Are newbies who are new to LED displays often confused about the black box? Where is the power capacitor hidden? This problem is like a novice learning to drive and can’t find the accelerator. We have to understand that the power capacitor is the "pacifier" of the display screen.​ ​80% of power failures are related to it​ ​. Today we will break it apart and break it down and explain it clearly.

​​The hidden rules of power system​​
Don't rush to remove the screws first, you have to know that the display screen is divided into two structures:​ ​Die-cast aluminum box​ ​and​ ​Sheet metal box​ ​. In die-cast aluminum box, the power capacitor usually squats in three places:

• ​​The upper left corner of the main power board​ ​: 2-3 cylinders, with insulating rubber caps
• ​​Back of the driver board​ ​: Flat round elements the size of beer bottle cap
• ​​Inside the power input port​ ​: Black square with ± pole logo

There is a real case that is quite interesting - the maintenance staff of a stadium searched for half an hour but didn't find the capacitor, and finally found it​ ​The entire power module is encapsulated in waterproof glue​ ​. So, when you encounter an IP65-protected screen, you must first find a maintenance port with hexagonal screws.

​​Three major errors in capacitance identification​​

Here is a tip:​ ​True capacitors have capacity marks​ ​, for example, the words marked "1000μF/35V". Let me teach you another trick - use a multimeter to measure the resistance value, and the resistance value of the capacitor will slowly climb from low to high, just like taking an elevator.

​​Why is my screen flickering? ​ ​
A customer asked this question half a month ago. At that time, the display screen installed at the door of the convenience store flashed like a haunted person at night. After checking,​ ​The main filter capacitor is bulging​ ​. This situation usually has three major signs:

1. There is a "sizzling" current sound when powered on
2. Wavy patterns appear on the corners of the display
3. The heat generation of power adapter increases dramatically

If I ask, it’s like a person suffering from high blood pressure, it’s too late to treat it when there are symptoms. ​ ​Use a thermal imager to scan the power module every month​ ​, immediately replace the capacitor if the temperature is abnormal, which can save 60% of the repair cost.

​​What is difficult to replace capacitors than light bulbs? ​ ​
Although it’s just a job of screwing, there are many tricks here. Last week, a young man changed the capacitor himself, but the circuit board pad was pulled off and the entire power module was scrapped. The correct process should be:

1. Wait for 5 minutes after power off
2. Clean the solder holes with a tin suction device
3. A new capacitor pin is turned around a buffer ring first
4. Spot welding time is controlled within 3 seconds

The key point is:​ ​Never buy cheap capacitors​ ​! Quality inspection data of a production line shows that the average life of a 5-yuan miscellaneous capacitor is only 2,000 hours, while military-grade capacitors can withstand 10,000 hours of continuous work.

Now I know why some display screens can last for ten years without breaking? After all, power capacitors are like the oil of a car, and regular maintenance is the best. I heard that the new generation of displays has started to be used​ ​Solid-state capacitor​ ​It is said that lifespan can triple. But that's all a story. If you encounter capacitor problems at the moment, it's absolutely right to follow what I said. Remember, live operation is not a joke, safety is always the first!

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