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Does the high-pitched whine from a TV bother you?

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Originally posted by: JCobra14
Originally posted by: Gobadgrs
Originally posted by: JCobra14
Originally posted by: shuttleteam YES IT MOST CERTAINLY DOES!!! -DAK-
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jeez dude, get that looked at your brain will explode after exposure to that
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aaahhh no you bastard!
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EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
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Damn, my teeth hurt after that, along with my eyes. I'll have to keep that sound around for the times when the boss shows up... :evil:
 
Originally posted by: JCobra14
The whine from the TV is at NTSC horizontal scan frequency about 15.7kHz. Thats at the upper limit of human hearing, some can hear it most cant. The CRT anode voltage (30kVDC) is derived from the horizontal circuit, the step up transformer (IHVT) is more than likely causing the whine

A computer monitor runs at much higher horizontal scan frequencies so even if they are making noise, you'll never know.
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I had a viewsonic monitor that did it, but only when it was off. I had to unplug it at night to get it to be quiet. It didn't do it when it was turned on.
 
Originally posted by: Gobadgrs
Good! Im glad im not the only one who hears that noise! It drives me nuts!
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The whine from the TV is at NTSC horizontal scan frequency about 15.7kHz. Thats at the upper limit of human hearing, some can hear it most cant. The CRT anode voltage (30kVDC) is derived from the horizontal circuit, the step up transformer (IHVT) is more than likely causing the whine

A computer monitor runs at much higher horizontal scan frequencies so even if they are making noise, you'll never know.

JCobra14
 
Originally posted by: cavemanmoron
Originally posted by: Gobadgrs Good! Im glad im not the only one who hears that noise! It drives me nuts!
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The whine from the TV is at NTSC horizontal scan frequency about 15.7kHz. Thats at the upper limit of human hearing, some can hear it most cant. The CRT anode voltage (30kVDC) is derived from the horizontal circuit, the step up transformer (IHVT) is more than likely causing the whine A computer monitor runs at much higher horizontal scan frequencies so even if they are making noise, you'll never know. JCobra14
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W....t.....f.....
 
Originally posted by: notfred
Originally posted by: JCobra14 The whine from the TV is at NTSC horizontal scan frequency about 15.7kHz. Thats at the upper limit of human hearing, some can hear it most cant. The CRT anode voltage (30kVDC) is derived from the horizontal circuit, the step up transformer (IHVT) is more than likely causing the whine A computer monitor runs at much higher horizontal scan frequencies so even if they are making noise, you'll never know.
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I had a viewsonic monitor that did it, but only when it was off. I had to unplug it at night to get it to be quiet. It didn't do it when it was turned on.
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A monitor operates in two states, standby and run. In run mode the switching powersupply and scan circuits are running, both can make an audible squeal. In stanby mode the switching powersupply is operating in a "supressed" state, only delivering a tiny amount of power at a lower frequency (audible range). Its possible the smps transformer could be ringing/vibrating but your only hearing it in standby mode due to the reduced frequency.

The idea behind a switching powersupply is as the frequency increases the power output increases as well. By controlling frequency they can maintain regulated power to the monitor... the powersupply operates at a lower frequency when very little power is being drawn by the load.

EDIT: im generalizing here, but most switching powersupplies operate this way. can we get some EE people in here to help me out?
 
Originally posted by: JCobra14
Most TV repair places can open the set up and quiet it down for you if its bothering you. My shop will do this for our $20 minimum charge, basically this involves dampening the vibration of the IHVT transformer, or SMPS transformer.

Call up some places in your area and see what they've got to say
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Whoah, cool. Any recommendations for a good shop in Seattle? I'm not sure what is considered "normal" for TV noise.

Rob
 
it doesnt bother me, i rather like it. i can then tell totally without looking far away that one of my TVs are on. i always thought everyone could hear it, guess not.
 
I only notice it when the cable box is turned off, as in the tv is on but no signal.
Otherwise as long as something is making noise on the tv I don't notice it.
 
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