Short Answer: Broken wire at the strain relief (near the plug or earcup) or a clogged mesh on the dead side.
Detailed: Single-sided audio failure is almost always mechanical, not electrical.
Diagnosis:
| Symptom | Cause |
|---|---|
| Sound cuts when wiggling the plug | Broken wire near 3.5mm jack |
| Sound cuts when moving head | Broken wire near earcup |
| One side completely dead, no crackle | Clogged mesh, burnt voice coil, or broken solder joint |
| Intermittent then permanent | Wire fatigue — internal copper strands snapped |
Repairs:
Broken wire near plug: Cut off the plug, buy a replacement plug (or use an old one), solder new connections (tip = left, ring = right, sleeve = ground)
Broken wire near earcup: Open the earcup, identify broken wire (usually red/blue/green/copper), solder splice, reinforce with heat shrink
Clogged mesh: Remove earpad, unscrew driver, clean the tiny metal mesh with alcohol and a toothbrush
Pro tip: Most headphone wires are enamel-coated (look like copper but don't conduct solder). Burn the tip with a lighter for 1 second or scrape with a knife before soldering.
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