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| How to correctly replace the SMD lamp beads on the lamp board |
| Time:2022-10-08 00:00:00 | view： |
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How to correctly change the SMD lamp beads on the lamp board I believe that friends who do SMT are often encountered. Our SMT semi -finished lamp bar will appear in such one or two abnormal lamps during the test. Due to the circuit design, most of the circuit boards are designed on a single road, and an abnormal lamp bead will also affect the lamp behind the lamp behind. The normal use of the bead, at this time we need to replace the single lamp bead. Now there are less direct insertion, basically the \"table stickers\" type. Because the feet are not led, LEDs can be close to the substrate, and the heat dissipation conditions have been completely improved. It is precisely because there is no \"foot\" that it also brings a lot of inconvenience to maintenance replacement. Let you take you to understand the correct and effective single lamp replacement method.To do the job of replacing the beads, you should wash your hands first to reduce the skin resistance to protect the lamp beads from being injured by electrostatic.并且准备好以下工具和材料就可以开工了热风枪可以选择最普通用于维修的就可以了，电烙铁要准备100w、30W左右各一把。 Mondrers and alcohol are used to help welded. Crossing the rosin with alcohol can be dissolved. The tin wire is used for fixation and conductive effects of lamp pads. LED lamp beads to be replaced are generally divided into the following: first talk about the imitation light beads. This kind of lamp bead is also in the bright place because the large body pad is also in the bright place, so it is easier to replace it. First, use the soldering iron to heat the two welding joints to remove the bad lamp beads, and then use the soldering iron to flatten the two pads. Do not leave too much welded so that the lamp beads can close to the aluminum substrate. Then put the new lamp beads in the original positive and negative electrode to the original, and then a little welded at the pins, and hold the lamp bead with your fingers to weld it. There should be a certain amount of solder on the soldering iron head during welding. When operating, you can use the soldering iron to quickly turn on the two pads to welded 2 to 3 times on the two pads. This is important, otherwise it is easy to cause the beads to suspend the air to affect heat dissipation. In addition, it is best to apply some thermal silicon grease on the circular pad in the middle to reduce thermal resistance. Small \"table stickers\" (also known as SMD) lamp beads will look more troublesome. Both the hot air gun and the electric soldering iron are disassembled down, as long as the aluminum substrate is not destroyed. Then use the soldering iron to remove the excess welding and leave only a thinner layer, and then click the welding to put the lamp in the original direction. The next step of welding should be started from the back, because the front pad is too concealed, and it will not be able to start with a hot air gun. Find the location of the lamp beads on the back of the aluminum substrate, and heat it with a large tile or hot air gun until the front weld is melted to weld the lamp beads. For the slightly larger lamp beads like 5730, in addition to the two welded joints that represent the LED poles, there will be a pads specifically for heat dissipation in the middle. Burning.
, of course, you can also use alcohol or other thermal sources to heat the aluminum substrate, as long as it can meet the need for welding. But sometimes occasionally damage a lamp bead, it does not necessarily be replaced. If more than 5 parallel lamp beads can be removed, it can be removed directly without being updated. Direct short circuits. The above two practices will increase the remaining light bead current, the more the number of connectivity, the smaller, and even no need to consider it. The second method has no effect on the remaining lamp beads. But one thing in common is that the surface of the lamp will appear dark or dark, affecting the overall aesthetics. The above is a way we often change lamp beads, hoping to help you. |
