With the rapid development of the times, the current popularity of domestic industries is very fast, and the switching power supply has gradually embarked on the center of the world stage. The volume of power supplies is gradually approaching templatization and miniaturization, and its anti-interference ability is also increasing. The stronger, but things take a long time, it will inevitably lead to failure, then in the face of these problems, how to solve it? The following Xiaobian will give you a brief introduction to the next switch power repair methods. What are the switching power supply repair methods? A fuse blows For this failure, we must first carefully check the various components on the circuit board to see if it is burned, there is no electrolyte overflow, but also can be heard to see if there is odor, of course, you can also use a multimeter to check, test If the resistance value of the lower power input terminal is less than 200K, it indicates that there is a local short circuit at the rear end. Second, no DC voltage output or voltage output instability First test with related equipment to see if each component of the high-frequency transformer is broken. Then look at the DC voltage at each output. If the output value is zero at this time, it means that the control circuit of the power supply has failed. Finally, use a multimeter static. Measure whether the rectifier diode and low-voltage filter capacitor in the high-frequency filter circuit are damaged. Third, the power supply capacity is poor This is a relatively common fault. It usually appears in old or long-term power supplies. When repairing, you can use a multimeter to check the voltage regulator diode's high-voltage filter capacitor, and whether the current-limiting resistor is degraded, and then carefully. Check if all solder joints on the circuit board are open or virtual. Fourth, no DC voltage output, but the fuse is intact When this happens, it means that the power supply is not working or it is in a protected state. When repairing, it must first determine whether the main control chip is in working condition or has been damaged. If it is bad, it will be directly replaced. If it is not bad, check it carefully. Whether the current limiting resistance of the gate (G-pole) of the switching power transistor is open-welded, virtual connection, variable value, deterioration, and whether the switching power transistor itself performs poorly. V. DC voltage output, but the output voltage is too high Most of these failures are due to the condition of the regulated sampling and control circuit. During the repair, the overvoltage protection circuit can be disconnected to make the overvoltage protection circuit inoperative, and then the main voltage of the power supply at the moment of starting can be measured. The normal value is higher than IV, indicating that the output voltage is too high. Six, cooling fan does not turn This kind of problem is mainly due to the status of the triode or the product itself. At this time, relevant equipment can be used for measurement. First, look at whether the triode is damaged. If it is not, it indicates that the fan itself has a problem and can be removed from the circuit board. Unplug, and then take a 12V DC to see if it will rotate. If it can, it means there is a broken wire inside the wire or the connector is in poor contact; if it still does not turn, the fan will be bad. Summary: Well, the above is about the switching power supply repair methods which are introduced, I hope to provide you with some help, I believe that in the future of the switching power supply repair process, friends will be more handy, to do home repair master. Linear Floor Drain,Stainless Steel Linear Floor Drain,Linear Shower Floor Trap,Linear Bathroom Channel Drain Kaiping City Jinqiang Hardware Products Co.,Ltd , https://www.jqfloordrain.com
