1, The common welding methods can be divided into electric soldering iron, heating platform welding and reflow soldering:
A: Electric soldering iron welding the most common, such as doing the kind, maintenance, as most of the existing manufacturers in order to save costs, repurchase of the soldering iron mostly substandard products, mostly poor grounding, there is leakage of the situation, the welding process This is equivalent to the tip of the leakage tip - was welded LED - the human body - the earth to form a loop, that is equal to several times - hundreds of times the lamp bear the voltage added to the LED lamp beads above, instant Burn it out.
Note: The case of static belt will be more serious, because when the human body connected to the ground after the formation of the circuit resistance to the smaller, through the human body to the lamp beads of the current will be greater, which is a lot of people said obviously with static electricity There are still so many problems with the damage to the lamp beads.
B: Heating platform welding caused by the death of the lamp, due to the continuous sample of light samples, most enterprises in order to meet the needs of small quantities and samples, due to low cost equipment, simple structure and other advantages, heating platform has become the best production tools However, due to the use of the environment (such as: there is a fan where the temperature can not be constant problem) and the welding operator's skill and welding speed control has become a large problem caused by dead lights, in addition to heating The equipment of the platform is grounded.
C: Reflow, the general welding method is the most reliable mode of production, suitable for mass production and processing, if improper operation, will cause more serious consequences of dead lights, for example, the temperature adjustment is unreasonable, poor machine grounding.
2, Improper storage caused by dead lights:
This problem is the most common, due to open the bag does not pay attention to moisture problems, because the lamp beads seal rubber and more use of silicone material, which has a certain water absorption characteristics, after the lamp after the lamp beads paste board, after high temperature welding process Silica gel will be thermal expansion and contraction, gold wire, chip, stent deformation caused by the gold line shift fracture, the lamp does not light phenomenon occurs, it is recommended: LED to be stored in a dry and ventilated environment, storage temperature of -40 ℃ - + 100 ℃, relative humidity below 85%; LED in its original packaging conditions within 3 months after use is better to avoid the rack rust; when the LED bag opened, as soon as possible after use, this When the storage temperature is 5 ℃ -30 ℃, relative humidity below 60%.
3, Chemical cleaning:
Do not use an unknown chemical liquid to clean the LED, as it may damage the surface of the LED colloid, and even lead to colloid cracks, if necessary, please wash your home with alcohol in a room temperature ventilation, the best time to control in a minute to complete the wind.
4, Deformation caused dead light:
As part of the lamp panel deformation, the operator will go to plastic, due to deformation of the board, the above lamp beads also followed by deformation, pull off the gold line, the light does not light, it is recommended that this type of board the most Fortunately, before the production of plastic processing. Longer in the production of assembly and moving over and may also cause deformation of the phenomenon of broken gold line. There is also caused by the stacking process, the production process in order to facilitate the smooth, light board will be stacked, due to gravity, the lower layer of lamp beads will be force deformation, damage gold thread.
5, The heat structure, power and light board does not match:
As the power supply design or choice is unreasonable, the power beyond the LED can withstand the maximum limit (over current, instantaneous impact); lamp cooling structure is unreasonable, will cause dead lights and premature light failure.
6, Factory ground: must check the factory's total ground wire is good.
Static electricity can cause LED function failure, it is recommended to prevent ESD damage LED.
A, LED detection and assembly of the operating staff must bring anti-static bracelet and anti-static gloves.
B, Welding equipment and test equipment, work tables, storage racks must be well grounded.
C, The use of ion fan to eliminate the LED during storage and assembly due to friction caused by static electricity.
D, Loaded LED box with anti-static material box, packaging bags using static bags.
E, Do not exist luck, readily touch the LED.
ESD damage caused by the LED will appear abnormal phenomena are:
A, reverse leakage, the light will cause the brightness to reduce the serious light does not light.
B, The forward voltage becomes smaller. Low current drive LED can not light.
C, Poor welding caused the lamp is not bright.