My tv started making a funny noise

Question

My TV a sony 21inch (its about 3 years old) has just recently started making a wierd noise, the noise is identical to the noise you get when a channel isnt tuned in properly, like the static noise, but it gradually gets louder and louder from when you turn it on, until after an hour or so you cannot hear the programme because of it. However, if you turn the power off, and then back on, its gone and is fine again. I dont understand? Please note everything is tuned properly, the picture is fine, the sound otherwise is fine, its just this background noise.

Answer 1

High-pitched whines are usually power supply problems.  You may not

realize it, but instant-on features of modern TV sets actually provide

some power to the electron guns in the picture tube so that they're

warm and ready to go.

I'd be cautious and have it checked -- it's probably an indication of

an imminent failure.  But if it shorts, it could make for more serious

problems.

Answer 2

could be a bad audio cable or inside the cable could be a loose wire causing your problem. Or it could be the av jack on the tv for the sound (generally has red, yellow, & white). Maybe one of those is bad.