Quote:
Originally posted by MagiK:
The high pitched whine sometimes heard from CRT type displays (TV's or computer monitors) is usually caused by the flyback transformer. This component is made of metal sheets laminated together with copper wires coiled around parts of it. The lamanint (sticky stuff that holds it all together) some times dries out and some of the metal plates are thus loosened just a tiny bit, allowing magnetic fields to cause them to vibrate causing the high pitched squeel.
I got this explanation a million years ago when I was doing electrical engineering studies in the Navy [img]smile.gif[/img]
Umm forgot to mention, this is usually a harmless effect, except for the insanity it drives some people to [img]smile.gif[/img] And should not affect the performance of the monitor unless it gets seriously bad, to the point where the transformer falls apart.
Also forgot to mention, the flyback transformer provides the really high voltage deflection current....I think...geez now I've forgotten... *sigh*
|
That is EXACTLY what it is! Not many people know this! But I need to add that this loosening can cause the fly-back to overcharge--you WILL know when this happens, you will hear a god-awful LOUD crackling sound, turn it off FAST before the circuit board in the Monitor (or a TV) gets overloaded as well.
I've installed new fly-backs in my 27 inch TV a few times (part costs around $20) compared to the $150 a repair shop charges--DO NOT ATTEMPT THIS yourself unless you know how to drain the charge out of the TV. tube, because those hold a few AMPS which kill VERY quickly, even if it's unplugged for a week, it still holds a charge.
But a friend of mine taught me this and I bought tools to do this.
Keep an ear to the sound--if the noise gets louder, it's getting worse, and you should take it in for 'primitive' repairs, or just buy a new one since the cost of repair shops charge as much as a new one would cost these days.
[ 09-12-2002, 04:09 PM: Message edited by: Ziroc ]