Sometimes the LED breaks suddenly, what could be the reason? Here are eight common causes and solutions to tell you.
1. Problems caused by abnormal power supply:
Check whether the power supply is working normally, whether the instruction light is on, if not, please check whether the power supply is connected;
Check whether the power cord of the lamp bead is connected with the positive and negative poles of the power supply, and whether it is reversed. If the above problems exist, please connect them correctly.
2.LED lamp beads for voltage requirements:
The nominal 3V LED lamp beads, in fact, different colors have different requirements for current, yellow requires the smallest current, followed by red, green, white, and blue. Excessive current will scorch the wick.
Use 2.4V rechargeable battery, yellow is easy to burn, because even if the voltage is not high, but the current is too large, it will still burn at will.
When using button batteries, although the voltage of the button battery is 3V, the discharge current of the button battery is very small, so the 3V LED lamp beads will not be burned. Therefore, when using LED lamp beads, you should choose a suitable power supply, pay attention to the voltage and current.
When selecting the power supply, if it does not meet the rated requirements of the LED lamp beads, the circuit needs to be improved, and a common resistor is installed!
3. How to divide the luminous color of LED lamp beads
If it is not powered on, if you want to make it easier to choose when purchasing, it is recommended to prepare a 3V button battery, which can be used to easily check what the LED emits when choosing.
4. Reasons for the burning of high-power LED lamp beads:
The upper and lower two filaments are called gold wires in our industry. Pure gold is used for conducting electricity. Two positive poles and two negative poles. A really good product will have a fifth wire, which is welded to the Zener tube. Protective.
The shortening of the filament already tells you clearly that your lamp has been burned by a large current, which is equivalent to a circuit breaker.
The high-power 1W drive current is about 350ma, and the working voltage is between 3.2-3.6V. Please pay attention when using it. Excessive current will definitely burn the lamp.
Generally, the aluminum substrates of the three 1W lamps are driven by about 12V. Few of them use 220V directly. Check if there is a constant current source or a 12V drive power supply.
5. Reasons for the yellowing of LED lamp beads
The yellowing of the LED outer encapsulant is mostly caused by the mismatch between the epoxy resin and the curing agent, but it cannot be ruled out that the baking time of the outer encapsulant is too long.
Solution: Buy a complete set of external sealant and curing agent, such as the model 800 or 2339 glue of fine chemical industry. The following conditions will not occur. In addition, pay attention to production control and strictly follow the operation instructions to avoid reasons such as excessive or insufficient baking time. This situation is well controlled.
6. Reasons for the leakage of LED lamp beads
The machine is not grounded, and the personnel are not wearing an electrostatic wristband (must be corded). Improper static protection caused by. In the packaging process, the PAD of the bonding wire is offset, and finally the quality of the chip itself is hidden.
7. LED lamp beads should be the problem of capacitive and inductive load
In fact, neither is the two, the LED lamp bead is a diode, it needs a positive conduction voltage to work, usually 2-3.5V, in addition, the current level can control the brightness of the LED lamp bead. In other words, LED lamp beads just convert electrical energy into light energy.
8. Reasons for the large decay of LED lamp beads:
Poor thermal conductivity of the iron bracket.
Yellowing of epoxy resin.
The contact between the chip and the support is not close enough.
The chip attenuation is large.
