Like computer monitors, a TV has very high voltages for the picture tube.
I don't want to bore you with the techy details why the voltage is there, but can safely say that colour monitors & TV sets can have voltages up to 30,000VDC and regulated to around 1mA!
Any stray body parts that touches the high voltage parts will recieve a very nasty shock. If the voltage is hand to hand (across your heart), you could end up dead.
I have serviced many TV & monitors and have accidently been "touched" by the high voltage.
It is kinda a funny feeling to wake up across the room! Now, when working with hi-voltages, I always obey the one hand rule!
The whining or buzzing can mean several things:
1) Normal operating condition. Read on...
The whining or buzzing is most likely the horizontal frequency @ around 15,750Hz. Most young people have a hearing range to over 20,000 hertz and can hear the whining or buzzing. However as we age, the ability to hear these frequency drops. I suppose this a positive side effect for those aging computer junkies?
2) Suspect components or components ready to fail.
3) The flyback transformer (produces the hi-voltage) is defective and could be arcing. The arcing sound can be a loud high pitched buzzing sound, like a drone of bees.
If the TV or monitor is buzzing, check the product in a darkened room and look through the vents in the back to see a blueish glow (arc). If yes, immediately turn off and get a TV service person to look at it.
TV sets & monitors alike should be left to techies that know how to service them.