Case 245 ยท Public preview
Pressure-Sensitive LEDs Can Conceal Different Internal Fractures
Two LEDs exhibited intermittent behavior, including one open device that temporarily operated when finger pressure was applied.
Functional testingOptical microscopyProgressive sectioningSEMBond-wire examinationDie inspection
What the evidence preview establishes
The two LEDs had different internal failure mechanisms. One contained a bond wire fractured in shear near its wedge bond; the other contained a fine horizontal die crack capable of opening and closing under mechanical or thermal-mechanical loading.
Why this case matters
Pressure sensitivity identifies an unstable connection, not a unique defect. Examine the complete LED structure because a fractured wire and a cracked die can produce similar intermittent symptoms while requiring different corrective actions.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.