Monitor noise harmful?

[dave197878]

My cab has 1 toggal switch that turns on the monitor, PC and marquee light all at once. My question is during the time i turn on the switched to the time the PC starts to boot there is a a kinda high pitch annoying sound that the monitor makes till the PC video kicks in. Once the PC provides video the sound goes away. It's an old Mk2 original monitor so I am trying to treat it gingerly.  

Is there any negative effects on the monitor during this time? I don't mind the annoying noise since it's just at boot just don't wanna fry the monitor.

Thanks.

[grantspain]

alot of monitors will make a frequency whistle without a signal present,i think it will be fine

[MonMotha]

While there is no signal, the PLL on the monitor will peg itself all the way at one extreme of its range.  Typically, that's the lowest possible frequency, which is most likely to be audible to you and will seem louder as you're more sensitive to it.  Once the signal shows up, it syncs up and runs at that frequency, which is going to be higher and perhaps inaudible to you.

In other words, it's probably ALWAYS making that "whine" or "whistle" signal; you just can't hear it when there's a signal

It's normal, too.  What you're hearing is mostly the core of the flyback transformer moving at ~15kHz, which is just barely audible for many humans.  Nothing will break from this.

If it's REALLY loud (like unbearably loud), the core of the flyback may be loose.  This is sometimes trivial to fix and sometimes essentially impossible to fix.  Just live with it, if possible.

[dave197878]

k ty for the response