Structural Diagnostic
Defect screening protocols evaluate physical anomalies within multilayer printed circuit boards and integrated circuit packaging without altering structural integrity or compromising electrical state. Performing non destructive board failure analysis preserves latent failure modes for subsequent physical verification through sequentially applied non-invasive imaging methods. Verification procedures establish fault locations prior to any mechanical cross-sectioning, mechanical grinding, chemical deprocessing or physical planar polishing steps.
Examination Modality
Internal interconnections suffer from latent defects such as microvia fatigue cracks, pad cratering, copper voiding or sub-surface conductive anodic filaments that escape visual inspection. Technical evaluation begins with high-resolution two-dimensional X-ray inspection to identify solder bridging and component misalignment, followed by acoustic microscopy to detect internal laminate delamination or die tilt. Computed tomography builds three-dimensional volumetric models of buried vias and internal plane connections without physically cutting the assembly.
Acoustic wave reflections and thermal emission mapping pinpoint internal electrical open circuits, allowing engineers to isolate failures to a single layer interface or joint prior to destructive sampling.
Analytical Scope
Nondestructive techniques fail when defect dimensions fall below the spatial resolution limit of the acoustic or radiological sensor. Complementary destructive cross-sectioning remains necessary when molecular material degradation or sub-micron copper fracturing must be confirmed under electron microscopy.
