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32 inch CRT TV - Occassional Whistling
steven123
21-06-2007
My largest TV, a two year old Goodmans 32 inch widescreen CRT set occassionally makes a high pitched whistling type noise during use. The noise is very low and only barely audible. It is also not continous rather sometimes happens for a few seconds and then can be heard a minute or two later or sometimes isn't heard again for several hours or even in the same day. I don't think it is a serious issue as the TV is otherwise working brilliantly just as well as when it was new. I can't remember exactly when the noise started indeed it may have been a 'feature' of this set since new.

Just wondering what makes this happen? I am pretty sure I havent heard it on any TVs I have owned previously and it does not happen at all on my 28 inch Widescreen Sony WEGA TV.

Any insights appreciated
Last edited by steven123 : 21-06-2007 at 18:03
John Currie
21-06-2007
Originally Posted by steven123:
“Just wondering what makes this happen?”

It's pretty common.
There are coils and transformers in TVs and as the current passes through the coils the windings vibrate causing the high-pitched noise...the windings of the coils are sealed with an adhesive to stop them vibrating...sometimes the windings become unstuck due to the use of a poor quality adhesive or heat buildup within the set causing the glue to lose its adhesives qualities.
StereRowe
21-06-2007
Most (CRT) TVs emit some high pitched noise - usually audible to only younger members of the family as we all lose the ability to hear over a certain frequency when we reach our twenties.

Yours however, could be the HT transformer. This can happen if a mainly 'static' set is moved for some reason - decorating or to a differant room for example.

You could be lucky and moving it sightly could reduce it. It could be a case of tightening something on the chassis - fixing screw for example.

But be aware.

There are some very dangerous voltages inside a TV so only attempt a repair if you know what you're doing.

StereRowe
steven123
21-06-2007
Originally Posted by StereRowe:
“Most (CRT) TVs emit some high pitched noise - usually audible to only younger members of the family as we all lose the ability to hear over a certain frequency when we reach our twenties.

Yours however, could be the HT transformer. This can happen if a mainly 'static' set is moved for some reason - decorating or to a differant room for example.

You could be lucky and moving it sightly could reduce it. It could be a case of tightening something on the chassis - fixing screw for example.

But be aware.

There are some very dangerous voltages inside a TV so only attempt a repair if you know what you're doing.

StereRowe”

Thanks, the high frequency of the sound might go some way to explaining why my mum, who uses the TV just as much, if not more than me has never heard the sound at all and wonders what I am talking about when I mention the TV whistling.

However the TV has never been moved at all since it was newly installed on its stand when I got it and considering its mammoth weight will not be moved again until its replaced; hopefully not for a long time.

The sound doesn't really bother me so I have no desire to try to stop it, just wanted to confirm what it was and that it was normal operation.
RobAnt
22-06-2007
I once had to swap out a monitor in the vacinity of a lot of young people who swore blind it was the loudest thing on the planet since Concorde.

Me? Couldn't hear a thing.

It was a radio station, so we had access to a frequency generator, and the audio engineers were able to prove that these youngsters could easily hear way above 16Khz - some as high as 18-19khz, whereas I was deaf above that.

Good quality Hi-Fi is usually rated as being able to present frequencies of between 20hz - 20khz at an almost even volume level. But I have seen my speaker cones moving at just 4hz - obviously way too slow to be able to create an audible noise.

ULF (ultra low frequencies) are used by whales, elephants and (oddly enough) navies, who need to contact submerged submarines.
Nigel Goodwin
22-06-2007
Originally Posted by RobAnt:
“Good quality Hi-Fi is usually rated as being able to present frequencies of between 20hz - 20khz at an almost even volume level. But I have seen my speaker cones moving at just 4hz - obviously way too slow to be able to create an audible noise.”

You're confusing yourself with the specifications!.

The 20Hz to 20KHz isn't a limit, it's merely the range which is flat within the specified margin of error. The system will work well outside those limits, but the response won't be flat.
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