Why does my device work after I hit it (percussive maintenance)?

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Short Answer: A loose connection, cracked solder joint, or stuck relay temporarily reconnects when shocked.

Detailed: This isn't a myth — it's called "percussive maintenance" for a reason. Common causes:

  • Loose ribbon cable – impact reseats it temporarily

  • Cracked solder joint – vibration makes intermittent contact

  • Stuck relay or motor brush – shock frees it

  • Oxidized connector – movement scrapes through corrosion

Real fix: Don't rely on hitting. Open the device, reseat all cables, reflow suspicious solder joints, and clean connectors with contact cleaner.

Warning: Hitting a device with a spinning hard drive or live CRT can make things worse — or dangerous.

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