Many TVs actually run their switchmode power supplies even when off to power
the standby stuff like the remote control receiver, real time clock or timer,
and channel memory. Depending on the design of the regulator, the power supply
may be running at a low chopper frequency due to the light load. Some people,
dogs, and rodents are then annoyed. It could also be an indication of a
fault like a bad capacitor or loosened transformer core if this symptom just
developed - your hearing isn't likely improving :-(.
|NotTaR of Television Sets : Whining when off?
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There is so much running nowadays in 'off' electronics!