Desoldering Skills and Daily Problems in PCBA Processing

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PCBA processing may not be a well-known term for everyone, but it has become an essential part of our market economy and daily life. In this context, I will discuss the topic of PCBA processing and desoldering. Do you know what the methods of desoldering PCBA processing are and what are the common problems that come with it?

1. Basic principles of PCBA processing and desoldering:

Before desoldering, it is essential to understand the original solder joint's characteristics and not do it hastily.

(1) Avoid damaging the pads and printed wires on the PCB circuit board (multilayer circuit board) during desoldering.

(2) Avoid damaging the electronic components, wires, and surrounding components that need to be removed.

(3) For electronic components that are damaged, cut the pins first and then remove them to reduce damage.

(4) Try to avoid moving the positions of other original components. If necessary, restore them.

2. Main points of PCBA processing and desoldering work:

(1) Strictly control the heating temperature and time to avoid high-temperature damage to other components. Generally, the time and temperature of desoldering is longer than that of soldering.

(2) Do not use excessive force during desoldering. The package strength of components under high temperatures decreases, and too much pulling, twisting, and twisting will damage components and pads.

(3) Absorb the solder on the desoldering point. Use a tin suction tool to absorb the solder and unplug the components directly. This reduces the time for desoldering and the possibility of damaging the PCB circuit board (multi-layer circuit board).

Desoldering Skills and Daily Problems in PCBA Processing

3. Desoldering methods:

(1) Centralized desoldering method:

Use a hot-air welder to quickly heat several welding points of row resistors and pull them out at once after the solder is melted.

(2) Split-point desoldering method:

For horizontally mounted resistance-capacitance components, use an electric soldering iron 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, stand up the PCB circuit board (multilayer circuit board), heat the pin solder joints of the component to be removed with an electric soldering iron, and use tweezers or needle-nose pliers to grip the component pin and gently pull it out.

(3) Shearing and desoldering method:

If there is a margin for the component pins and wires on the unsoldered spot, cut off the components or wires first, and then remove the wire ends on the pads.

(4) Keep the desoldering method:

Use a suction tool to suck the solder from the unsoldered point first. Under normal circumstances, components can be removed.

If you encounter multi-pin electronic components, use an electronic hot air blower for heating.

If it is a lap-soldering component or pin, dip flux on the solder joint and open the solder joint with an electric soldering iron. The component pin or wire can be removed.

If it is hook-welded components or pins, use an electric soldering iron to remove the solder from the solder joints first. Then heat with an electric soldering iron to melt the residual solder under the hook. At the same time, use a spatula to lift the pins in the direction of the hook line gently. Do not use too much force when prying to prevent the melted solder from splashing into the eyes or on the clothes.

4. Problems that should be paid attention to when re-soldering after PCBA patch processing and desoldering:

(1) Pass through the blocked pad hole.

(2) Restore moved components to their original state.

(3) Try to keep the pins and wires of the re-soldered components consistent with the original ones.

Why Choose China PCBA Supplier KSPCBA as Your PCBA Processing Manufacturer?

– Experienced and skilled team

– State-of-the-art equipment

– Strict quality control

– Excellent customer service

– Competitive price