Strange sound from my projection tv?

Hi,
My 40 inch RCA crt rear projection tv is almost 5 years old, I never had a problem with it until recently. The picture and the sound is not affected at all by the strange hissing sound comming at the bottom of the set. Its more like an air leaking sound from vehicles’ tire. It contiues the whole time I watch the tv and end as soon as I switch it off. When I turn it on, it hissing sound starts after about a minute time. Its definitly not coming off my tv speaker as I have disabled them since I am using external speaker systems. Yes, I tried it with my external amp off, and I still get the hissing sound off the tv. Could it be a flyback transformer issue. Should I even worry since it doesn’t interfeare with the picture and the sound quality. Please tell me what it could be.
Thanks in advance!

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