What are the common problems with smd led chip?

What are the common problems with smd led chip?

Common problems caused by improper power supply:
a. Check if the power supply is working properly, and the indicator light is not lit. If it is not lit, please check if the power supply is connected.
b. Check whether the power cord of the lamp bead is connected to the positive and negative poles of the power supply. Is there any reverse? If any of the above problems exist, please connect them correctly.
LED lamp beads for voltage requirements:
Standard 3V LED lamp beads, in fact, different colors have different requirements for current, yellow requires minimum current, followed by red, green, white, and blue. If the current is too large, the wick will burn. Using a 2.4V rechargeable battery, it is easy to burn, because even if the voltage is not large, but the current is too large, it will still burn.
 
No power detection LED:
In the case of no power supply, if you want to pick it up at the time of purchase, it is recommended to have a 3V button battery. It is convenient to check the LED light when selecting it.
 
Reasons for burning high-power LED lamp beads:
01, two filaments above and below, our industry is called gold wire, pure gold, for conductive, two positive, two negative, really good product will have a fifth line, welded on the Zener tube, from Protective effect.
02, the filament is short, it has been very clear to tell you that your lamp has been burned by a large current, equivalent to an open circuit.
03. The driving current of high power 1W 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.
04. Generally, the aluminum substrates of three 1W lamps are driven by about 12V. Rarely use 220V directly. Do you see if there is a constant current source or a 12V drive power?
 
Why is the LED lamp bead yellow? The reason for the yellowing of the LED outer sealant is mostly due to the mismatch between the epoxy resin and the curing agent, but it cannot be ruled out that the outer sealant is baked for too long.
LED lamp bead leakage: improper static protection. Then, in the packaging process, the welding line PAD is biased, and finally the quality problem of the chip itself.
LED lamp bead should be a problem of capacitive and inductive load: in fact, neither is LED lamp bead is a diode, it needs a positive turn-on voltage to work, usually 2-3.5V, in addition, current The size can control the brightness of the LED bead. That is to say, LED lamp beads only convert electrical energy into light energy.
The reason why the LED lamp has a large attenuation: the attenuation of the low-power LED has four reasons: One: the bracket has poor thermal conductivity. Two: epoxy resin yellowing. Three: The chip is not in close contact with the bracket. Four: The chip has a large attenuation. If it is white light, there is a problem with phosphor attenuation.
 
Taking a common problem with smd led chip, Yuanke Optoelectronics Co., Ltd. is a manufacturer specializing in the design and production of SMD LED lamp beads. With the company's quality policy of "scientific management, excellence, customer trust", we continuously develop and launch LED series products that meet customer needs. The company operates in strict accordance with the ISO9001 quality management system, and wins the trust of customers with professional management concepts based on customer requirements, creating value for customers.