Case 2543 ยท Public preview
Similar LED Symptoms Can Conceal Two Unrelated Internal Failure Mechanisms
Multiple LEDs from one investigation failed electrically, but internal examination showed that they did not share a single physical mechanism.
Electrical testingOptical microscopyProgressive sectioningSEMFailed-sample comparison
What the evidence preview establishes
One LED opened after shrinkage and fracture of the silicone encapsulant displaced a cathode wire bond, while other LEDs suffered electrical-overstress damage involving the LED die and protection diode.
Why this case matters
Do not generalize from the first failed unit in a multi-sample investigation. Compare every physical failure signature; common symptoms can result from a displaced interconnect in one device and electrical overstress in another.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.