Case 1764 ยท Public preview
Silver-Poor Die Attach Can Produce Intermittent Open Green LEDs
The green elements in four tri-color LEDs were open while their red and blue elements operated normally; several green elements relit during section preparation.
Constant-current testingOptical microscopyMicrosectioningSEMEDSMulti-sample comparison
What the evidence preview establishes
The most consistent failure mechanism was unstable conduction through silver-epoxy beneath the green dice. Silver-poor regions reduced particle contact, and slight sectioning displacement restored conduction, supporting progressive die-attach wear-out.
Why this case matters
Conductive epoxy depends on a connected particle network that may fail intermittently without a visible gross separation. Record electrical behavior throughout section preparation and compare multiple dice before assigning an open to a wire bond.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.