Case 1973 ยท Public preview
BGA Fractures and Local Phosphorus Enrichment Can Flag a Suspect ENIG Process
Two BGAs on one assembly were examined by microsectioning and pry-and-SEM analysis to assess solder-joint integrity in a follow-up investigation.
Pry-and-SEMBSE SEMMicrosectioningEDSStandardless ZAF analysis
What the evidence preview establishes
Incipient fractures in three of four examined corner joints, phosphorus-enriched pad surfaces, and an associated nickel-plating defect indicated a systemic BGA-interface problem and suspect ENIG processing. The exact contribution of each condition remained unresolved.
Why this case matters
Combine fracture surfaces with intact sections and localized chemistry. Use pad-surface versus bulk-nickel comparisons to evaluate ENIG susceptibility, then investigate plating geometry and assembly factors without reducing a multi-factor interface problem to one unproven cause.
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