Case 1544 ยท Public preview
Lens Delamination Can Load and Separate an LED Ball Bond
Field and intermittent LED failures occurred even though the external wedge bonds and several die-attach regions appeared intact.
Optical microscopyProgressive microsectioningSEMEDSFailed-to-functional comparison
What the evidence preview establishes
The failed LEDs most likely opened when lens material separated from the die surface and loaded the gold wire, causing separation at the ball-bond-to-pad interface.
Why this case matters
Correlate separation with the failed electrical interface. A comparison device may reveal an important manufacturing weakness without proving that the same weakness caused the field symptom.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.