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I own a Dell Ultra Scan P991 FD Trinitron (19 inch). I've owned it for about a year, and although this may not be a new problem, I just started to notice that when I turn it on. The noise is high-pitched and not very loud, but still annoying. This does not always happen though so I'm not sure what's going on. When I turn the monitor off, the noise stops, but turning it on again makes the noise come back. A friend told me that the monitor is "warming up" so its makes the noise. The noise goes on for a couple minutes, sometimes longer (I never really pay attention because I eventually tune it out of my head).
Any suggestions?
It's a "whistling capacitor" and it's running way too hot. Hope it's still under warranty as one day soon the capacitor will burn out and it will not power up at all.
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I'm an engineer and used to repair TV's - never heard of a whistling capacitor in the whole of my life.
It is usually the laminations of either the line output transformer or the line driver transformer. They are usually soaked in pitch to minimise this. It is nothing to do with overheating, will not cause burn outs or any other problems.
Precious little you can do without taking the monitor apart, but there's some 25000 volts in there and the charge remains for a long time. So LEAVE IT!
Seems sad to suggest a new monitor though. Don't laugh but a bang (not too violent) on the left or right side at the back/bottom might shut it up sometimes. I have known this problem to "cure itself".
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what the hell is a whistling cap? Listen to
Derek.The only "whistling" cap i ever had
was one that was hooked up on the wrong
polarity and the top blow off.Had 100 feet of
paper and tin foil all over the shop.greg
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I don't know about no whistling caps but I had a 5 year old monitor that last year was making high pitched noises like that and it finally just up and died on me this past janurary, the screen just burned out or something. My guess is that its probly on its last legs; hitting on the side may just prolong the inevitable.
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I had a customer who bought a new monitor from me and about 6 months later it also had a high-pitch sound, I gave him a new one and I brought it in my shop for the last year and not once did it ever make a sound of any kind, to this day I have no answer to why it works fine with my pc's but not his.
I tried changing his video card before I replace the monitor but it didn't help in any way,Kevin
OneCall Computer Service
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Back when I was in school(the 80's) I could always tell when someone turned on a t.v. in the adjacent classroom, cause the t.v. would make a VERY high pitch noise that you could BEARLY Hear. I don't know what it was(old t.v. so i must be SUPER high radiation)
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Yeah. It's just like I said.
When you are young you can hear this 16kHz+ whistle but if you wait long enough you will not hear it at all.
In no way should you anticipate impending doom. If the monitor does go "phut" it is just the luck of the draw - any blow-ups will be due to some other quite unrealted cause - they do happen. Just try to ignore this whistle or get a new monitor.
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Thank you very much everybody for your input. I tried to lightly bang on the monitor with no luck. Now that I know it's not normal, I'll give Dell a call before my 1 year warranty and repair expires. Thanks again.
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Just to let everybody know. I gave Dell a call and they are replacing my monitor with a brand new one, free of charge. Thanks again to all that contributed. Without your help, I might have been stuck with a dying monitor and not have known it until my warrantee expired.
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I was having the same problem with my Dell Trinitron P991. However... the high-pitched noise occured only when I had the screen set to 1280 x 1024 pixels. There would be no noise at the other pixel settings.
I called Dell and they had me change the refresh frequency on the monitor (in Windows 2000, disply, settings, advanced, monitor, refresh rate) to 85 hertz. So far, this seems to have stopped the problem....
We'll see how long it lasts...
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