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Although the service life of LED fluorescent lamp is long, the general warranty is 2-3 years, and some even require higher requirements, reaching 5 years. After the warranty period, LED fluorescent lamp also has the problem of repair. The biggest advantage of LED lamp is that it can be repaired repeatedly. It is an environmentally friendly lamp. So, how to repair it? How to tell what's wrong?

Longte Company answers your questions

I. The first is the problem of distinguishing faults

1. One of the problems is that it doesn't light up. This condition is generally a hard problem. The so-called hard problem is generally aimed at soft problems. That is to say, this condition is generally caused by component damage or open circuit. For example, fuse open circuit, input line blocked, output line open circuit and other conditions are generally easier to clean up. We generally use the cleaning method to identify the problem. After turning on the LED tube, Check whether the incoming line is connected, then check the power end, and use a multimeter to check whether the fuse is disconnected. If the fuse is connected and still does not light up, it is possible that the power supply is broken. Together, ensure that the output red and black line is also normal and there is no open circuit

2. The second problem is flashing or flashing after turning off the lamp. This situation belongs to a soft problem. Compared with the hard problem, it is caused by the damage of components in the circuit. It is more difficult to repair than the hard problem. However, as long as you have patience and check step by step, you can still find the local problem. For example, many LED fluorescent lamps find flashing after a period of time. This problem, According to our long experience, there is usually a problem with the filter capacitor. In some cases, when the service life is up, the electrolyte may dry. The solution to this situation is to change an electrolytic capacitor with the same capacity and voltage. In fact, it is very simple

3. The problem of power supply is generally simple. How to judge if there is a problem with the LED light board? Two approaches

3.1. According to the naked eye discrimination method, if you see black spots on the LED beads, they are generally burned out and need to be replaced

3.2. Use DC voltage to directly light the LED lamp board. If it is not lit, it is obviously bad. It needs to be replaced. This requires the cooperation of adjustable high-voltage power supply

II. LED lamp board replacement experience

1. Usually, the LED lamp board is broken, so we have to replace it directly. However, some led beads are broken, or a single one doesn't touch well. How do we repair them?

2. There is one way: remove the LED lamp beads, select the damaged LED lamp beads, and then weld them with a soldering iron. However, due to the small pad of the LED lamp beads, it is difficult to weld them. In addition to some people with good welding technology, can they be welded. Is there any other way? Yes, that's the second way

3. Select a hair dryer, heat the LED bulb so that it will naturally take off, and then put a new LED bulb. The merit can be completed. The hair dryer is simple to obtain. We should also remind us. It is best to point solder paste on the new bulb, which will have a better effect. It is not easy to have bad touch. It is best not to blow against the bulb, but heat it on the opposite side of the aluminum substrate, This can protect the LED beads from damage

4. The heating tin furnace is selected for repair. This small equipment is generally available in the electronic market, and the price is not expensive, but it is very easy to use. It only needs to put the aluminum substrate on it, and the solder pad will actively melt the tin. The LED lamp beads are easy to remove. This efficiency is the highest, and sometimes even the LED lamp plates can be repaired in batches

III. replacement of power supply: before replacement, first judge the LED bulb string parallel status of aluminum substrate, and then decide how much current power supply to choose. Otherwise, if the current is large, the power will be too large, the current will be small, and the power will not be enough. In some cases, direct replacement will also burn the LED lamp board. As for the current accounting, in addition to self accounting, the power supply factory can also help you calculate, The law is that the lamp string is high and the current is small; The light string is low and the current is high. Don't confuse it

Article from: LED fluorescent tube manufacturer http://mushuren.cn/