The load capacity of the switching power supply is poor, and the output voltage is unstable and low, in fact, it can be repaired by changing parts
As a plumbing maintenance worker, I often face a wide variety of circuit problems. Sometimes, the problem may seem complicated, but in reality it may not be difficult to solve. The story I want to share today is about the maintenance of a switching power supply, the problem seems complicated, but in fact, it only needs to be solved by changing a small part.
The story begins one morning when I received a call from a customer who said that there was a problem with the power supply of the computer at home. He described that computers often lose power suddenly, and even when they are powered on, their screens flicker from time to time. Hearing this, I guessed that the switching power supply might be faulty, so I immediately arranged a time to go to the repair.
After arriving at the client's home, I first did a thorough inspection of the computer. Once I confirmed that it was indeed a problem with the switching power supply, I began to disassemble the computer host to prepare for a more in-depth inspection of the switching power supply.
After opening the case of the power supply, I took a closer look at the board with a flashlight. Everything looks normal with no visible signs of damage. I was secretly glad that this repair might be easier.
However, when I started to take circuit measurements on the switching power supply, the situation changed 180 degrees. I found that the voltage at the output was significantly lower than normal, and the voltage fluctuated greatly when the load was connected, and the power supply could not be stabilized at all.
This situation confuses me, because in general, the problem of switching power supply is relatively easy to locate and solve. I started to re-examine each component in the hope of finding the problem.
Upon closer inspection, I noticed a small capacitor that looked a little black. Capacitors are a very common component in switching power supplies, and they play an important role in smoothing the output voltage, reducing noise, etc. However, although it is small, it cannot be ignored, and its failure can lead to unstable output of the entire switching power supply.
I immediately tested the capacitor with a multimeter and it showed that its capacitance was severely low and far from the design requirements. This is the culprit that causes the output of the switching power supply to be unstable!
After getting a new capacitor, I reassembled the switching power supply and then put it to a full test. The good news is that everything is back to normal when the computer is powered back on, and there are no more power outages and flickering screens.
This repair, while deceptively simple, is a typical circuit troubleshooting process. Sometimes, the root of the problem can be hidden in seemingly inconspicuous widgets. To solve these problems, careful observation, patient inspection, and rich experience are required.
Through this repair, I once again felt the importance of expertise. In circuit maintenance, every detail may be related to the stability and performance of the entire system. Therefore, as a plumbing maintenance worker, we need to keep learning and gaining experience to meet a variety of challenges.
Overall, repairing a switching power supply is not as difficult as it seems. The key is to identify the root cause of the problem and take the right steps to address it. Sometimes, even a small component needs to be replaced to revitalize the entire system. This is the charm of circuit repair work, every repair is a challenge and an opportunity for growth.