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Under normal circumstances, the Dell E2310Hc LCD Monitor seems to work fine. However, when I display an large array of hash characters ("#") a faint buzz can be heard from the monitor. It appears to be correlated to the periodic pattern somehow:

  • Increasing the size of the pattern (i.e. changing the font size) changes the frequency of the noise.
  • Adding more pattern enhances the sound.
  • Increasing the contrast increases the intensity of the sound.
  • Color does not seem to affect the sound.
  • Increasing the contrast of the pattern w.r.t. the background increases the sound.
  • Edit: Horizontally tiled patterns make little contribution, but vertically tiled patterns cause the majority of the noise.

What could be causing this? I also noticed the same issue with another LCD monitor but it's a lot less perceptible.

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Have you verified this happens with somebody else present? –  osknows Aug 21 '12 at 23:50
    
No I have not done so. –  Rufflewind Aug 22 '12 at 2:32
    
Are we troubleshooting for electrokenesis by having the other person present? Also, what if their hearing isn't as good as @fyl –  Everett Aug 22 '12 at 2:35

1 Answer 1

up vote 2 down vote accepted

Electromagnetic forces generated by the flows of electricity within the device are causing parts to vibrate due to alternating magnetic attraction and repulsion.

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Is this normal behavior for a "typical LCD monitor" though? –  Rufflewind Aug 21 '12 at 22:35
2  
It's normal behavior for absolutely every single electric or electronic device on the planet. –  Ignacio Vazquez-Abrams Aug 21 '12 at 22:36

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