Hello, I recently bought a 43-inch Sharp smart TV. I noticed today that if I bring your ear closer, being turned off but plugged in, it makes a buzz that is barely heard but is there. It is only heard if you approach the ear a lot, but we have changed the plug because in the previous one it was heard as an electrical noise, being turned off for hours but plugged in, it was not a loud sound, you had to approach to hear it but it showed more than The current sound. What can it be? A TV failure or I have an electricity problem in the house?