Shaoxing Xinshan Science Technology Co.,Ltd
Address: Dongfangyimai, No. 2, Pujiang Road, Shaoxing, China
Before learning LED lights maintenance technology, let's for the LED light source to do a simple understanding.
LED (Light Emitting Diode), light-emitting Diode, is a solid-state semiconductor devices, it can be directly put DianZhuan into Light. The heart of the LED is a semiconductor chip, chip attached on a bracket, at the end of the end is negative, the other end connected to the power of the anode, the chip is encapsulated by epoxy resin.
Conductor chip consists of two parts, one part is a p-type semiconductor, dominated by holes in it, the other end is n-type semiconductor, in this way is mainly electronic. But this two kinds of semiconductor connected, between them to form a p-n junction. When a current flows through a wire to the chip, the electron will be pushed P area, electron and holes in the P zone compound, then will be issued in the form of photon energy, this is the principle of LED.
LED can emit a variety of different colors of light, according to different materials, green light is commonly gallium phosphide (GaP), red for aluminum gallium arsenide (GaAs), blue for GaN, three kinds of mixed also can be white, but the current widely used is GaN + YAG (yttrium aluminum garnet) way.
Ordinary small power leds are generally adopts single 1 w high-power lamp bead assembly, working voltage of 3.0-3.2 V, current 340 ma, brightness is 100 lm. Pay attention to both ends of metal "-", "+" polarity, look below:
Below we together to learn a simple structure of the LED tube light, disassembly and maintenance:
1, positive appearance, look from the lens, there are seven lights, namely 7 w;
2, on the back of the figure
3, disassembly: general hands seize the radiator and lamp body respectively, radiator rotation can be disassembled to the left.
4, choose digital multimeter measuring gear, with red and black pens and can point to measure LED lamp bead light one by one.
5, pay attention to the red pens and represents the positive output power measurement, so a certain point in leds "+" sheet metal, black pens and point on the "-" metal, if there is no damage to the LED lamp bead, should be able to light up, see below:
6, if the test is not bright, basically can determine damaged, it will replace the lamp bead, use tweezers clamp lamp bead, metal is heated with good electric heating solder, then remove;
7, clean solder on the original solder, avoid caused by uneven light after light bead welding bead and heat dissipation substrate poor contact;
8, the new lamp bead to apply thermal conductive silicone, contributes to heat, to avoid substrate a gap;
9, pay attention to the soldering technique in one hand and solder wire, soldering iron hand operation, gathered in the solder joints, solder to rapidly melting welding head on the solder joints, solder wire commonly contain or rosin flux, does not need to be prepared and flux or rosin;
10, the electric test completed, no problem recovery after assembly, the poor quality of the lamps and lanterns of heat dissipation base plate and heat sink not blot out thermal conductive silicone, also affect the heat dissipation of lamp bead, bad heat dissipation can accelerate the lamp bead the cause of aging, so be sure to remember to apply silicon grease;
10.1, the lamps and lanterns for the silicon grease
10.2, daub silicon grease
10.3, below each lamp bead daub, accelerated cooling
10.4, daub substrate and radiator against
10.5, tighten the radiator
11, assembly, again drive power supply for testin
It is important to note that there are many kinds of drive voltage grade of LED lamps and lanterns, depending on the number of concatenated, rated voltage is different also, therefore, to pay attention to the matching of voltage; Also need to pay attention to match current, over voltage, over current is easy to burn the LED chip.