Led lights switching power supply controller how to repair
If you just use it alone, it's broken. It is recommended to buy one. Because the maintenance needs to change the device, and their purchase of equipment is expensive, and can not determine that the device is bad.
If you are learning to repair, it depends on the principle of switching power supply. Principles of understanding, the manufacturers work, maintenance is very simple.
Check the power input terminals of the rectifier diodes, high voltage filter electrolytic capacitors, inverter power switches and other components are not breakdown, open circuit and damage. But also to see the various components on the circuit board to see whether the appearance of these components without burning paste, with or without electrolyte overflow and so on.
With a multimeter to measure the secondary original, excluding high-frequency rectifier diode breakdown, load short-circuit situation, if this time the output is zero, then you can certainly be the power of the control circuit is a problem. Then you can use the static measurement of the corresponding components to check out the damaged components.
Common faults and maintenance techniques for switching power supplies
1. Fuse blown: In general, the fuse blown on the power of the internal line is a problem. Because the power supply in the high voltage, high current state, it will cause the power supply current instantaneous increase and let the fuse blow.
Maintenance Tips: Check the power input of the rectifier diodes, high voltage filter electrolytic capacitors, inverter power switches and other components are not breakdown, open circuit and damage. But also to see the various components on the circuit board to see whether the appearance of these components without burning paste, with or without electrolyte overflow and so on.
2. No DC voltage output or voltage output instability: the main power of a short circuit, open circuit phenomenon, then the power load is too heavy, high-frequency rectifier filter circuit rectifier diode breakdown, filter capacitor leakage and so may cause this Happening.
Maintenance techniques: first with a multimeter to measure the secondary original, excluding high-frequency rectifier diode breakdown, load short-circuit situation, if this time the output is zero, then you can certainly be the power of the control circuit is a problem. Then you can use the static measurement of the corresponding components to check out the damaged components.
