Thermal Defect Attribution Models for Mixed Consigned and Turnkey Boards
Thermal defect attribution in mixed consigned assembly requires combining profile logs, 3D X-ray data, and MSL handling records to split material and process liability.
Defect Attribution
Responsibility Determination
The systematic identification of the root cause of a printed circuit board assembly failure assigns accountability to either the materials supplier, the board fabricator, or the assembly provider. Implementing clear defect attribution practices ensures that corrective actions are applied at the correct stage of the manufacturing process. This assessment relies on physical evidence and cross-sectional analysis rather than assumptions or finger-pointing.
By isolating the exact process step where the error was introduced, the customer can request appropriate remedy.
Failure Investigation
Forensic analysis of a failed solder joint, for example, reveals whether a defect stems from poor board solderability or incorrect reflow oven profiles. If the board’s pad finish has oxidized prior to assembly, the issue points to a board fabrication defect. However, if the solder paste has not reached its liquidus temperature, the failure resides with the assembly provider’s thermal profile.
Fabricators and assemblers must share test logs, thermal profiles, and bare-board storage histories to determine the truth. This collaborative investigation helps resolve disputed assembly issues.
Financial Liability
Assigning blame holds direct financial consequences for the involved supply chain partners. The responsible party typically covers the cost of scrap material, rework labor, and expedited shipping charges. Therefore, the attribution process must be backed by verifiable laboratory reports to be contractually binding.