What Are The PCBA Desoldering Methods?

During the desoldering process, some electronic components with poor soldering are often encountered. Faced with the electronic components in this situation, we generally remove the electronic components that have been soldered incorrectly without damaging the pcb board.

Desoldering method:

(1) Split-point desoldering method: For horizontally installed resistance-capacitance components, the two solder joints are far apart, and an electric soldering iron can be used for heating at points and pulling out point by point. If the pin is bent, use the tip of a soldering iron to pry it straight before removing it. When desoldering, put the pcb upright, while heating the pin solder joints of the component to be removed with an electric soldering iron, use tweezers or needle-nose pliers to clamp the pin of the component and gently pull it out.

(2) Centralized desoldering method: Since each pin of the row resistor is soldered separately, it is difficult to heat it at the same time with an electric soldering iron. You can use a hot-air welder to quickly heat several soldering points, and pull it out once the solder is melted. out.

(3) Keep the desoldering method: use a suction tool to suck the solder of the desoldered point first. Under normal circumstances, components can be removed. If you encounter multi-pin electronic components, you can use an electronic hot air blower for heating.

If it is a lap-welded component or pin, you can dip flux on the solder joint and use an electric soldering iron to open the solder joint, and the component's pin or wire can be removed. If it is hook-welded components or pins, first use an electric soldering iron to remove the solder from the solder joints, and then heat with an electric soldering iron to melt the residual solder under the hook, and at the same time use a spatula to lift the pins in the direction of the hook line. Do not use excessive force when prying to prevent the melted solder from splashing into the eyes or on the clothes.

(4) Cut and desolder method: If there is margin for the component pins and wires on the desoldered point, or if the components are determined to be damaged, you can cut off the components or wires first, and then remove the wire ends on the pads. Come down.

Problems that should be paid attention to when re-soldering after desoldering

(1) The pins and wires of the re-soldered components should be as consistent as the original ones;

(2) Pass through the blocked pad hole;

(3) Restore the moved components to their original state.