What a Good PCBA Quality Report Should Include: Beyond the Photos

A batch of assembled boards arrives from a contract manufacturer, accompanied by a "quality report": four glossy photographs of the boards from different angles, a line that says "AOI passed," and a stamp. It looks reassuring. It tells you almost nothing.

Photos confirm that boards exist and that they look clean from the outside. They do not confirm that the BGA joints under the package are sound, that the components are the right values, that the board functions, or that you can trace a field failure back to a specific solder paste lot. A genuine PCBA quality report is a data package, not a photo album. This guide explains what a meaningful report contains, why each element matters, and how to ask for the documentation that actually protects you. Linked Electronics Co., Limited provides structured quality documentation with every PCBA order, scaled to the class and criticality of the build.

Why Photos Alone Are Not a Quality Report

Photographs have a place — they document cosmetic condition, confirm correct board revision, and provide a visual record for the customer. But they capture only what a camera can see from the outside, which excludes the majority of what actually determines whether a PCBA is good:

• BGA and QFN solder joints are hidden under the component body — invisible to any external photo.
• Component electrical values cannot be read from a photo; a 10k resistor and a 1k resistor look identical.
• Solder joint internal voiding, head-in-pillow defects, and cold joints do not always show on the surface.
• Functional behaviour — whether the board actually works — is not a visual property at all.

A report built only on photos gives the buyer a false sense of assurance. The defects that cause field failures are precisely the ones a photo cannot show. A real report documents the inspection and test steps that look inside and verify function.

The Elements of a Real PCBA Quality Report

1. AOI (Automated Optical Inspection) Results

AOI machines scan every board with high-resolution cameras and compare against a reference, flagging missing components, wrong orientation, misalignment, solder bridges, and insufficient or excess solder on visible joints. A meaningful report states that 100% of boards passed AOI, the defect categories checked, and any defects found and reworked. Linked Electronics Co., Limited runs AOI on every assembled board and logs pass/fail by board.

2. X-Ray Inspection for Hidden Joints

BGAs, QFNs, and bottom-terminated components have solder joints hidden under the package that AOI physically cannot see. X-ray inspection penetrates the package to image these joints, detecting voiding, bridging, open joints, and head-in-pillow defects. For any board carrying a BGA, an X-ray result is the single most important line in the quality report — its absence is a red flag. Linked Electronics Co., Limited performs X-ray inspection on every BGA-bearing board and reports void percentage against the IPC-7095 acceptance threshold.

3. Electrical Test Results (ICT or Functional)

Inspection confirms the board looks right; testing confirms it works. The report should state which test was performed:

• ICT (In-Circuit Test) — probes individual components on the assembled board to verify values, polarity, and placement. Catches wrong, missing, or misplaced parts.
• Functional Test (FCT) — powers the board and exercises its actual function against a test specification. Catches defects that ICT misses, such as firmware or system-level faults.

Not every board needs both, but the report should be explicit about what was tested and the pass rate. Linked Electronics Co., Limited performs ICT and functional test to customer-supplied specifications and reports results per board or per lot as specified.

4. Solder Joint and Workmanship Standard

The report should reference the workmanship standard the assembly was inspected against — almost always IPC-A-610, with the class stated (Class 2 for general commercial, Class 3 for high-reliability). This single reference tells the buyer what acceptance criteria were applied to every joint and component. A report that does not name a workmanship class leaves the standard undefined.

5. Traceability and Material Records

For any serious program, traceability is what turns a quality report from a snapshot into a protective record. A complete report ties the build to:

• The exact BOM revision and component date/lot codes used
• The solder paste lot and its expiry/handling record
• The reflow profile applied
• The operator and line, where required by the program
• Date and batch identifiers

If a defect surfaces in the field six months later, traceability lets both buyer and manufacturer isolate the cause to a specific lot rather than recalling everything. Linked Electronics Co., Limited maintains lot-level traceability and provides material records as part of the documentation package for Class 3 and customer-specified programs.

6. First Article Inspection (FAI) Report

For a new build or a new revision, a First Article Inspection report documents that the first board off the line was checked in detail against the design — every component, value, orientation, and placement verified before the full run proceeds. FAI catches BOM errors, footprint problems, and setup mistakes before they are replicated across the whole order. Linked Electronics Co., Limited performs FAI on new builds and revisions and shares the FAI record on request.

7. Certificate of Conformance (CoC)

The CoC is the formal statement that the order was manufactured to the agreed specification and standard. It ties together the build details, the standards applied, and a signed declaration of conformance. It is the document quality auditors and regulated-industry buyers look for first. Linked Electronics Co., Limited issues a Certificate of Conformance with every order on request, and as standard for Class 3 work.

What a Report Should Look Like by Build Type

Red Flags in a Quality Report

When evaluating a contract manufacturer's quality documentation, these signs indicate the report is decorative rather than substantive:

• Photos only, no inspection data. The most common gap. A clean photo of a BGA tells you nothing about the joints underneath.
• No X-ray on a board with BGAs. If the build has BGAs and the report has no X-ray, the hidden joints were never verified.
• "AOI passed" with no detail. Passed against what criteria? How many boards? What defects were found and reworked?
• No workmanship class named. Without an IPC-A-610 class, the acceptance standard is undefined.
• No traceability. If a field failure cannot be traced to a lot, every future failure becomes a full-fleet investigation.
• No named test method. "Tested" is meaningless without specifying ICT, functional, or the test coverage.

How to Ask for the Right Report

The simplest way to get a meaningful quality report is to specify it on the purchase order. A clear request:

"Quality documentation required: 100% AOI results, X-ray inspection on all BGA/QFN with void percentage per IPC-7095, functional test per attached spec, workmanship per IPC-A-610 Class 2, First Article Inspection report, lot-level traceability, and Certificate of Conformance."

Specifying the documentation up front ensures the manufacturer prices and plans for it, rather than producing a photo album after the fact. Linked Electronics Co., Limited treats the documentation specification as part of the order requirements and confirms the report scope at quotation.

Frequently Asked Questions

Do I need X-ray inspection if my board has no BGAs?

Generally no. X-ray exists to inspect hidden joints under BGAs, QFNs, and bottom-terminated components. If every joint on your board is visible to AOI, X-ray adds little. Linked Electronics Co., Limited applies X-ray where hidden joints exist and does not charge for it where it is not needed.

What is the difference between AOI and X-ray?

AOI uses visible-light cameras and inspects what can be seen from above — surface joints, component presence, orientation, alignment. X-ray penetrates packages to inspect joints hidden underneath, such as BGA balls. They are complementary: AOI covers the visible majority of joints quickly, X-ray covers the hidden critical ones. A complete inspection process uses both where applicable.

Is a Certificate of Conformance the same as a quality report?

No. A CoC is a single formal declaration that the order met specification — a summary statement. A quality report is the underlying data (AOI, X-ray, test, traceability) that supports that declaration. The CoC is the cover; the report is the contents. Serious programs want both. Linked Electronics Co., Limited provides both for Class 3 work.

Should prototypes have full quality reports?

Prototypes benefit most from First Article Inspection and AOI, which catch BOM and setup errors before they propagate. Full traceability and functional test are usually scaled back for prototypes unless the prototype is destined for regulatory submission. Linked Electronics Co., Limited tailors prototype documentation to the customer's intent — design validation versus regulatory pre-build need different packages.

What standard governs PCBA workmanship inspection?

IPC-A-610 (Acceptability of Electronic Assemblies) is the dominant workmanship standard, paired with IPC J-STD-001 for the soldering process. The report should name the class — Class 1 (general), Class 2 (dedicated service), or Class 3 (high reliability). Linked Electronics Co., Limited inspects to IPC-A-610 Class 2 as standard and Class 3 on specification.

Can Linked Electronics Co., Limited provide reports for regulated industries?

Yes. For medical, automotive, and industrial customers with documentation requirements, Linked Electronics Co., Limited provides AOI and X-ray data, ICT/functional results, full lot traceability, FAI, and Certificate of Conformance. For customers with specific quality-system requirements, our team can discuss documentation formats and additional records needed to support your audits.

Does a quality report cost extra?

Standard inspection data (AOI, X-ray on BGA boards, photos) is part of the normal process at Linked Electronics Co., Limited and included. Extended documentation — detailed FAI, full traceability packages, custom report formats, functional test development — may carry an engineering or per-lot charge depending on scope, quoted up front so there are no surprises.

Why Linked Electronics Co., Limited Treats Documentation as Part of the Product

Linked Electronics Co., Limited operates turnkey PCB fabrication and SMT assembly in one facility, which means the quality documentation we provide spans both the bare board and the assembly — from bare-board electrical test and microsection coupons through to AOI, X-ray, functional test, and Certificate of Conformance on the finished PCBA. Our view is that a quality report is part of what the customer is buying, not an administrative afterthought.

Every PCBA order at Linked Electronics Co., Limited includes AOI on all boards and X-ray on all boards carrying hidden-joint components as standard. For commercial volume, we add functional test to the customer's specification and lot-level traceability. For high-reliability Class 3 work, we provide the full package: detailed FAI, complete traceability including solder paste lot and reflow profile, IPC-A-610 Class 3 workmanship inspection, and a signed Certificate of Conformance.

If you are evaluating contract manufacturers and want to understand exactly what quality documentation you will receive, send your project details and documentation requirements to [email protected]. Linked Electronics Co., Limited will confirm the full report scope as part of your quotation — before the first board is built.

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