1.As the LED drive power, driving a variety of ways, this article will give a typical low-power LED switching power supply isolation as an example to illustrate.
2.Look at the driver board, if there are obvious signs of burns, should first consider the replacement of components, such as the pre-circuit in the fuse and rectifier bridge, the two components are easy to surge voltage and inrush current damage components.
3.Most of the LED drive circuit is the use of flyback switching power supply, which is the way the drive, the switch is a very important component, with a multimeter to the alarm file, measuring the drain and the source, the gate The pole and the source are punctured, and replaced by the breakdown
4.If the output voltage is unstable, there may be feedback circuit and switch circuit problems, see the switch driver IC, optocoupler and TL431 regulator IC is conductive damage, if damaged to consider the replacement.
5.If the drive board burns too much, will consider replacing the drive board, PCB board line damage will be unnecessary maintenance.
Non-professional personnel are prohibited from disassembling the drive for maintenance, so as to avoid unnecessary consequences.
Use a soldering iron to be careful of the risk of high temperature burns
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