IBE enables the world’s best brands. Through our unrivalled customer-centric approach, we partner with leading companies in numerous markets to deliver solutions for their most complex challenges.

Gallery
Contacts

IBe Industry Building, ShenZhen, China

ibe@ibepcbaaa.com

+86-75581785031

Electronic manufacturing industry
How do you desolder a PCB board?

Desoldering a PCB involves the process of removing soldered components or solder joints from a printed circuit board (PCB). This process is necessary when repairing, replacing, or modifying electronic components on the board. Desoldering PCB is crucial to ensure proper functionality, repair defects, or make changes to the PCB design.

Table of Contents

When is it necessary to desolder the PCB?

Component Replacement: When a component needs to be replaced due to failure, upgrade, or repair, desoldering is necessary to remove the old component from the PCB.

Circuit Modification or Prototyping: For circuit modifications, upgrades, or prototyping, desoldering might be required to change the arrangement of components or introduce new ones.

Repairing Soldering Defects: In cases where there are soldering defects, such as bridging, insufficient solder, or damaged connections, desoldering allows for the rework of solder joints.

Testing or Troubleshooting: During testing or troubleshooting procedures, desoldering might be necessary to isolate specific components or test individual parts of the circuit.

Environmental Compliance: In some cases, recycling or proper disposal of electronic components and PCBs might necessitate desoldering to separate materials for recycling purposes.

Upgrading or Salvaging Components: For salvaging valuable or reusable electronic components from old PCBs or devices, desoldering is required to remove these components intact.

In essence, desoldering is essential whenever there’s a need to remove components, repair soldering defects, modify circuits, or salvage valuable parts from a PCB. It’s a crucial skill in electronics repair, prototyping, and maintenance processes.

How to desolder PCB?

Desoldering a PCB involves removing components or old solder from the circuit board. Here’s a general guide on how to desolder components from a PCB:

How to desolder PCB?

Tools Required

Soldering Iron: A temperature-controlled soldering iron with a fine tip.
Solder Sucker or Desoldering Pump: Used to remove molten solder.
Desoldering Braid/Wick: Copper braid designed to absorb molten solder.
Flux: A flux pen or liquid flux to aid in the desoldering process.
Safety Gear: Eye protection and a well-ventilated area are recommended.

Steps for Desoldering Components

Prepare the Workspace: Ensure the work area is well-lit and ventilated. Put on eye protection.

Heat the Solder: Use the soldering iron to apply heat to the solder joint or component lead. This melts the solder, making it easier to remove.

Use Desoldering Braid/Wick: Place the desoldering braid or wick over the molten solder and press it down with the tip of the soldering iron. The braid will absorb the melted solder.

Desoldering Pump/Sucker: Alternatively, use a desoldering pump: Heat the joint, place the nozzle of the desoldering pump against the molten solder, and trigger the pump to create a vacuum, sucking up the molten solder.

Repeat if Necessary: For larger joints or if there is excess solder, you may need to repeat steps 2-4 until the joint is sufficiently desoldered.

Remove Component: Once the solder is removed, gently wiggle and lift the component leads using pliers or tweezers until the component is free from the board.

Clean the Area: Clean the desoldered area with alcohol or a cleaning agent to remove any flux residue.

Tips for desoldering PCB

Apply flux before desoldering to improve solder flow.
Control the soldering iron temperature to avoid damaging the PCB or components.
Practice caution to prevent damage to the PCB traces or pads while desoldering.
Desoldering requires patience and precision. Proper technique and the right tools are essential for successful desoldering without damaging the PCB or its components. Practice on scrap or old boards before attempting desoldering on critical or valuable components.

How many times can you desolder a PCB?

The number of times a PCB can be desoldered largely depends on several factors:

Component and PCB Quality: High-quality components and PCBs designed for multiple reworks tend to withstand desoldering more effectively.

Desoldering Technique: Proper desoldering techniques, such as using the right tools, controlling soldering iron temperature, and minimizing stress on the PCB, can reduce the impact of desoldering on the board.

Physical Wear and Tear: Each desoldering cycle might introduce small amounts of stress, heating, or mechanical strain to the PCB and components. Over time, this can weaken solder pads or tracks, limiting the number of successful desoldering attempts.

Solder Pad Condition: With repeated desoldering, solder pads or traces might become damaged or lift from the PCB surface, making further desoldering challenging or ineffective.

How many times can you desolder a PCB?
How many times can you desolder a PCB?

Generally, a PCB can withstand several desoldering cycles if the desoldering process is carried out meticulously and the PCB and components are of good quality. However, excessive desoldering and rework attempts can degrade the PCB and components, potentially leading to failures, lifted pads, or damage that makes further desoldering less feasible or successful.

It’s advisable to limit desoldering to the necessary extent and take precautions to maintain the integrity of the PCB and components to maximize the number of safe desoldering attempts.

What temperature is needed for desoldering PCB?

The desoldering temperature required for a PCB largely depends on the type of solder used, the components being desoldered, and the specific characteristics of the soldering iron being used. However, a general range for desoldering temperature is typically between 300°C to 400°C (572°F to 752°F).

Here are some considerations regarding desoldering temperatures:

Solder Type: Different solder compositions melt at various temperatures. Lead-based solder typically melts at lower temperatures compared to lead-free alternatives. Lead-free solder requires higher temperatures for melting and removal.

Component Sensitivity: Some electronic components, especially sensitive ones like integrated circuits or plastic-packaged components, can be damaged by excessive heat. Lower temperatures or using a heat shielding material might be necessary to protect these components.

Soldering Iron Control: Temperature-controlled soldering irons allow precise adjustment of temperature. They enable you to set the temperature suitable for the specific solder and components you’re working with.

Flux Use: Using flux helps in solder flow and removal. It assists in lowering the melting point of the solder, making desoldering more efficient at lower temperatures.

When desoldering, it’s crucial to strike a balance between applying enough heat to melt the solder without overheating the components or the PCB. Experimentation and practice on scrap components or old PCBs can help determine the optimal temperature for successful desoldering without damaging the board or components.

Conclusion

Mastering the art of desoldering is essential for anyone involved in electronics repair, maintenance, prototyping, or modification. It requires precision, patience, and the right tools to ensure components are removed without damaging the PCB or other nearby components.

FAQ

Desoldering a PCB involves the process of removing soldered components or solder joints from a printed circuit board (PCB).

Prepare the Workspace
Heat the Solder
Desoldering Pump/Sucker
Repeat if Necessary
Remove Component
Clean the Area

The desoldering temperature required for a PCB largely depends on the type of solder used, the components being desoldered, and the specific characteristics of the soldering iron being used. However, a general range for desoldering temperature is typically between 300°C to 400°C (572°F to 752°F).

IBElogo

Author

IBE

IBE Electronics is a leading EMS provider in China, with rich experience and expertise, providing customers with excellent service and creating superior products to improve people’s lives.

Leave a comment

Your email address will not be published. Required fields are marked *