In the work of debugging and repairing electronic equipment, it is often necessary to replace some components. The premise of replacing components is of course to desolder the original components. If the method of desoldering is not proper, the printed circuit board will be damaged, and even if the components do not fail, they cannot be reused. Desoldering is more difficult than soldering and requires proper methods and tools. If the soldering is not done properly, it is easy to damage the components, or the copper foil will fall off and damage the PCB. Therefore, desoldering technology is also a basic operation skill that should be mastered.
Today, AiXun Precision Soldering will introduce the relevant knowledge of desoldering.
1. Desoldering method
Generally, components such as resistors, capacitors, and transistors that have few pins, and each lead can be relatively movable can be directly desoldered by a soldering iron. Hold the printed board upright, heat the solder joint of the component to be removed with a soldering iron, and use tweezers or needle-nose pliers to clamp the component lead and pull it out gently.
2. When desoldering integrated circuits or multi-pin components with multiple pins, there are generally the following methods.
A. Desoldering with soldering iron or suction device
The tin-absorbing soldering iron is very useful for desoldering. It can remove the components to be replaced without blocking the soldering holes at the same time, and it is not limited by the type of components. However, it must remove tin from solder joints one by one, which is not efficient, and the inhaled solder must be removed in time.
B. Use professional smart desoldering tools
Smart desoldering station, desolderable and solderable. Take AiXun iHeater 3rd Gen smart desoldering station for example. It support X-14 pro max and Android mainboard disassemble and separate, A10/A11/A12/A13 CPU glue removing, home button rapair, face ID 11 dock connector repair, android mainboard preheating, etc. The PID intelligent temperature algorithm and the new MCH ceramic heating plate chip allows temperature raise faster, accurate as well as safety.
C. Desoldering with hot air gun or infrared welding torch
Hot air gun or infrared soldering torch can heat all the solder joints at the same time, and take out the components after the solder joints are melted. For surface mount components, desoldering works best with a hot air gun or infrared torch. The advantage of using this method for desoldering is that the desoldering speed is fast, the operation is convenient, and it is not suitable to damage the components and the copper foil on the PCB.
3. How to operate when desoldering components with plastic skeleton
1. First heat with an electric soldering iron to remove the solder at the soldering point, exposing the outline of the lead wire
2. Then use tweezers or needles to pick off the residual solder between the pad and the lead
3. Finally, use the tip of the soldering iron to heat the individual solder joints that have been picked up. When the solder is melted, quickly unplug the components
The above is some knowledge about desoldering. If you have any questions, welcome to contact AiXun.
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