A Transformer Winding Short Can Drive Cascading Circuit Damage

What the evidence preview establishes

A short between the primary and bifilar secondary windings placed line voltage onto a lower-voltage circuit, causing downstream capacitor and resistor failures. A single thin insulation-tape layer and large voids at the winding interface were plausible construction contributors.

Why this case matters

For cascading damage, reconstruct electrical event order before assigning blame to the most visibly damaged component. Verify winding isolation and examine insulation thickness, voids, creepage, and process consistency at high-potential interfaces.