Structural Audit
Analytical procedures in electronics failure analysis expose internal physical fractures in solder joints that are hidden from non-destructive inspection methods. The dye-and-pry test represents a destructive methodology where an assembly is immersed in a low-viscosity dye, dried, and then mechanically forced apart to reveal fracture patterns. It provides a clear visual map of solder joint coverage and fracture surface area on both the board pad and the component ball.
It isolates the exact location of cracks by mapping where the dye has penetrated the joint before the physical separation.
Failure Detection
Dye penetration occurs only where a physical gap exists in the solder interface. The dye-and-pry test reveals cracking beneath area array packages that automated x-ray systems cannot resolve. Technicians inspect the separated interfaces under a microscope to measure the percentage of dyed area on each pad.
Evaluation Protocol
Testing begins with the application of a liquid dye that flows into any microcracks via capillary action. After the liquid dye cures, the board is subjected to a tensile force that pulls the component away from the circuit board to expose the solder lands. The resulting patterns on the pads indicate whether the failure occurred within the solder sphere or at the intermetallic layer.
Handlers document the findings to adjust reflow profiles or mechanical support structures in subsequent manufacturing runs.
