What Is the Most Common PCB Problem? (And How to Choose a Manufacturer to Avoid It)

If you’ve ever experienced a device suddenly failing or behaving erratically, there’s a good chance the problem traces back to the printed circuit board (PCB). Understanding common PCB problems isn’t just technical knowledge—it’s the key to making smarter decisions about your electronics projects.

More importantly, knowing these issues helps you choose the right manufacturer. Because here’s the truth: most common PCB problems are preventable with the right manufacturing partner.

This guide explores the most frequent PCB problems, what causes them, and how to select a manufacturer that consistently delivers quality boards.

The #1 Most Common PCB Problem: Solder Defects

According to industry research, solder-related defects account for nearly 50% of all PCB failures. These problems occur during the assembly process when components are soldered onto the board.

Cold Solder Joints

Cold solder joints happen when the solder doesn’t heat enough to properly bond the component lead to the PCB pad. The connection looks good visually but is mechanically weak and electrically unreliable.

What causes it:

• Insufficient heating during soldering
• Moving the component before solder cools
• Contamination on the pad or component lead
• Using old or oxidized solder

How it affects your board:

• Intermittent electrical connections
• Complete connection failure
• Device stops working unexpectedly
• Hard-to-diagnose problems

Cold solder joints are particularly frustrating because they often work initially but fail after days, weeks, or months of operation.

Solder Bridging

Solder bridging occurs when excess solder connects two or more pads that should be electrically isolated. This creates an unintended electrical short circuit.

What causes it:

• Too much solder paste applied
• Incorrect reflow profile
• Poor PCB design (pads too close together)
• Contamination during soldering

How it affects your board:

• Short circuits damage components
• Device won’t power on
• Erratic behavior
• Complete system failure

The Second Most Common Problem: Short Circuits

Short circuits represent approximately 25-30% of PCB failures. A short circuit happens when current flows through an unintended path, bypassing the proper circuit route.

Types of Short Circuits

Manufacturing shorts: These occur during PCB fabrication when:

• Copper etching is incomplete
• Drill bits break inside holes
• Plating bridges separate traces
• Inner layers misalign

Assembly shorts: These happen during component placement when:

• Solder bridges connect traces
• Component leads touch adjacent pads
• Debris gets trapped under components

Design shorts: Poor design creates shorts when:

• Traces are too close together
• Inadequate clearances specified
• Ground planes improperly designed

Short circuits are dangerous because they can:

• Destroy expensive components instantly
• Create fire hazards in high-power applications
• Cause complete system failure
• Require complete board replacement

Third Most Common: Component Placement Errors

Incorrect component placement accounts for 15-20% of PCB problems, particularly in complex assemblies with hundreds or thousands of components.

Common Placement Issues

Wrong orientation: Components like diodes, electrolytic capacitors, and integrated circuits must be placed in the correct direction. Reversed polarity causes:

• Component damage
• Circuit malfunction
• Safety hazards

Missing components: Sometimes components are simply not installed. This happens due to:

• Pick-and-place machine errors
• Bill of materials (BOM) mistakes
• Human oversight in manual assembly

Wrong component value: Installing the wrong resistor or capacitor value prevents proper circuit operation even though the board looks correct.

Fourth Most Common: Contamination

Contamination problems represent 10-15% of PCB failures and come from various sources during manufacturing and handling.

Types of Contamination

Flux residue: Leftover flux from soldering can:

• Attract moisture
• Cause corrosion over time
• Create electrical leakage paths
• Degrade circuit performance

Moisture: Water contamination during manufacturing causes:

• Corrosion of copper traces
• Delamination of board layers
• Component failures
• Electrical shorts

Chemical contamination: Improper handling introduces:

• Oils from hands
• Cleaning chemicals
• Manufacturing residues
• Environmental pollutants

Particulate contamination: Dust and debris can:

• Create shorts
• Prevent proper solder wetting
• Interfere with component placement
• Cause intermittent failures

Other Common PCB Problems

Trace Damage

Broken or damaged copper traces prevent current flow and cause open circuits. This happens from:

• Excessive mechanical stress
• Poor handling
• Manufacturing defects
• Thermal stress

Plating Issues

Problems with copper plating in through-holes include:

• Insufficient plating thickness
• Plating voids or gaps
• Poor adhesion
• Barrel cracks

Delamination

Board layers separating from each other causes:

• Structural failure
• Electrical disconnection
• Moisture infiltration
• Complete board failure

The Root Cause: Why These Problems Happen

Understanding why PCB problems occur reveals an important truth: most defects are preventable.

Research shows that approximately 64% of avoidable PCB defects result from human error. These include:

• Incorrect component placement
• Improper soldering techniques
• Poor quality control
• Inadequate testing
• Rushed production schedules

The remaining issues come from:

• Equipment malfunctions
• Material defects
• Design flaws
• Environmental factors

The key insight: Partnering with a quality-focused manufacturer eliminates most of these problems before they reach your hands.

How Choosing the Right Manufacturer Prevents PCB Problems

The difference between a reliable PCB and a defective one often comes down to manufacturer quality control. Here’s what separates good manufacturers from problematic ones.

1. IPC Standards Certification

The Institute for Printed Circuits (IPC) creates industry standards that define quality levels. Quality manufacturers follow these standards religiously.

Key IPC standards to look for:

IPC-A-610: Acceptability of Electronic Assemblies

• Defines what “acceptable” means for solder joints, component placement, and workmanship
• Three quality classes (1, 2, 3) with ascending reliability requirements
• Class 3 is required for aerospace, military, and medical devices

IPC-A-600: Acceptability of Printed Boards

• Standards for bare PCB quality before assembly
• Covers plating, etching, drilling, and lamination
• Defines accept/reject criteria

IPC-6012: Qualification and Performance Specification for Rigid PCBs

• Performance requirements for fabricated boards
• Testing procedures
• Quality assurance protocols

Manufacturers following IPC standards consistently produce better boards because they maintain documented, verified processes.

2. ISO Certifications (H3)

ISO certifications demonstrate a manufacturer’s commitment to quality management systems.

ISO 9001: Quality Management Systems

• Ensures consistent processes
• Requires continuous improvement
• Mandates documentation and traceability
• Proves systematic quality approach

ISO 14001: Environmental Management

• Shows responsible manufacturing practices
• Reduces environmental impact
• Indicates modern, well-managed facilities

ISO 13485: Medical Device Quality Management (for medical applications)

• Required for medical device manufacturing
• Stricter than ISO 9001
• Ensures highest quality standards

3. Automated Optical Inspection (AOI)

Quality manufacturers invest in AOI systems that automatically scan every board for defects. These systems catch:

• Solder bridges
• Missing components
• Wrong components
• Polarity errors
• Placement issues

AOI happens multiple times during manufacturing:

• After solder paste application
• After component placement
• After reflow soldering
• After final assembly

Manufacturers using AOI achieve defect rates under 50 parts per million (PPM)—that’s 99.995% quality.

4. X-Ray Inspection

Advanced manufacturers use X-ray inspection for:

• Ball Grid Array (BGA) solder joint quality
• Hidden solder connections
• Through-hole plating verification
• Internal layer alignment

X-ray inspection finds problems that visual inspection misses entirely.

5. Functional Testing

Beyond visual inspection, quality manufacturers perform functional testing:

• In-Circuit Testing (ICT): Tests individual components and connections
• Flying Probe Testing: Verifies electrical connectivity
• Functional Test: Confirms the assembled board actually works as designed

Functional testing ensures you receive boards that work, not just boards that look good.

Real-World Example: The Cost of Poor Manufacturing

Consider a company that ordered 1,000 PCBs from a low-cost manufacturer to save money. They received:

• 15% defect rate (150 defective boards)
• Additional rework costs: $50 per board × 150 = $7,500
• Production delays: 3 weeks
• Customer dissatisfaction: immeasurable

By contrast, ordering from a quality manufacturer with 0.1% defect rate:

• 1 defective board
• Minimal rework: $50
• No delays
• Happy customers

The “savings” from choosing the cheapest manufacturer cost far more than the premium for quality would have.

Checklist: Choosing a Manufacturer That Prevents PCB Problems

Use this checklist when evaluating PCB manufacturers:

Certifications & Standards

• IPC-A-610 certified facilities
• ISO 9001 quality management certification
• RoHS compliance (for environmental requirements)
• UL certification (if needed for your application)

Quality Control Processes

• Automated Optical Inspection (AOI)
• X-ray inspection capabilities
• In-circuit testing available
• Functional testing offered
• Documentation of quality processes

Experience & Capability

• Years in business (5+ years preferred)
• Experience with your type of PCB
• Technology capabilities match your needs
• References from satisfied customers

Communication & Support

• Responsive to inquiries
• Technical support available
• Clear documentation provided
• Design for Manufacturing (DFM) review offered

Manufacturing Capabilities

• Appropriate equipment and technology
• Clean, organized facilities
• Trained, certified operators
• Process documentation

Why MorePCB Stands Out in Quality Manufacturing

When preventing common PCB problems is critical, MorePCB offers the quality assurance you need. Their approach addresses each problem at its source:

For solder defects: MorePCB uses advanced reflow ovens with precise temperature profiling and AOI inspection after every soldering stage, catching defects before they leave the facility.

For short circuits: Multiple inspection stages including AOI, electrical testing, and final functional testing ensure electrical integrity.

For placement errors: Automated pick-and-place equipment combined with verification systems prevent component mistakes.

For contamination: Climate-controlled clean rooms and proper handling protocols maintain board cleanliness throughout manufacturing.

MorePCB’s quality commitment includes:

• Full IPC standards compliance
• ISO 9001:2015 certification
• State-of-the-art inspection equipment
• 99.9%+ quality rate
• Comprehensive testing protocols

With experience in aerospace, medical, automotive, and consumer electronics, MorePCB understands that reliability isn’t optional—it’s essential. Their team works with you from design review through final delivery to ensure your boards meet specifications.

Learn more about MorePCB’s quality processes at MorePCB.com.

Taking Action: Your Next Steps

Understanding common PCB problems is the first step. The second step is choosing a manufacturer that prevents these issues.

Whether you’re developing a new product, scaling production, or looking to improve reliability, the right manufacturing partner makes all the difference.

Before selecting a manufacturer:

1. Review their certifications and quality standards
2. Ask about their testing and inspection processes
3. Request references from similar projects
4. Discuss your specific quality requirements
5. Verify they have appropriate capabilities

Remember: The most common PCB problems—solder defects, short circuits, placement errors, and contamination—are all preventable with proper manufacturing practices.

Investing in quality manufacturing isn’t just about avoiding problems. It’s about ensuring your products work reliably, your customers stay satisfied, and your business builds a reputation for quality.

Choose wisely. Your success depends on it.

In Conclusion

The most common PCB problem—solder defects—accounts for nearly half of all failures. However, when you consider solder defects, short circuits, placement errors, and contamination together, they represent the vast majority of PCB issues.

The good news? All these problems are preventable with the right manufacturing partner.

Quality manufacturers distinguish themselves through:

• Rigorous adherence to IPC standards
• Advanced inspection and testing equipment
• Trained, certified operators
• Documented, repeatable processes
• Genuine commitment to quality over speed

When choosing a PCB manufacturer, don’t make decisions based solely on price. Consider the total cost of ownership, including rework, delays, and potential product failures.

By understanding common PCB problems and selecting a manufacturer committed to preventing them, you ensure your electronics projects succeed from the very first board.