Continuous noise (high frequency). HS110EU V4
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hello
i have a new device an HS110EU V4; Firm 1.0.5.
When connected it makes a high frecuency noise, which is continuous. It is only removed when the plug is activated, in stand-bye is always heard.
I attach a link with a video, live higher the sound.
Video: Sonido alta frecuencia.
Factory reset doesn´t solve anything.
It a noticiable noise thoughout the room.
It is a typical filter noise in switched power sources.
it does the same in other plugs.
It is of a high frecuency of about 10Khz, meadured with the mobile and the spectroid app.
It´s not a loud sound in db, but you always listen and a lot when there´s silence.
Attached screenshot.
Sorry for my English.
Hi, sorry to write to you in Spanish but it is easier for me to explain it to you, later you try to translate it. Or you ask me again, thank you.
No he conseguido solucionar el problema ya que es un fallo de diseño de Tp-LINK. Si es asi.
Lo unico que he conseguido es que algunas veces en vez de poner el Hs110 en el enchufe de la pared directamente si lo colocas a traves de un prolongador multiplicador de enchufes de esos de dos o tres tomas con un trozo de cable, el ruido se atenua bastante. Adjunto foto de la regleta a la que me refiero. 
Otra opcion es probar en otros enchufes de casa, a veces parece que dependiendo del enchufe suena un poco menos, no se porque.
Pero es un fallo del dispositivo. Es de la bobina de alimentacion que produce armonicos con la tension de red.
Solucion de TP-LINK, devuelve el producto. No van a investigar ni solucionar nada.
Siento no poder ayudar mas.
Thank you.