Need some tech experts..

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Morkonan wrote:

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When i read text and mostly white/black text on word file or on web page, my monitor is making some low noise, but high frequency pitch sound.

It doesn't do that on games or on blank screen.

Just on text.

Monitor is Dell S2340L

I work a lot with 3D applications and get this occasionally, as well.

A quick sort of troubleshooter list: https://support.viewsonic.com/en/support/solutions/articles/33000222284-why-is-there-high-pitched-noise-from-my-monitor-

Also, what connector type are you using? You may want to try cabling with a ferrite core that helps to prevent interference. The "ferrite core" is that heavy cylinder bit that appears to be wrapped around a cable, typically for monitor cables. A standard HDMI cable, for instance, won't typically have one. An HDMI cable intended to be used specifically as a monitor cable will often have one.

That's because you're literally connecting from "one machine" to "another machine," which is your computer box and its power supply and lots of stuffs that use power inside it to another computer box with its own independent power and lots of other stuffs that make use of independent power inside it. :)

The first choice is to adjust your contrast and brightness settings. (That's basically stuff that pushes a bunch of power, AFAIK.)

Making sure your cabling is firmly set, and is not too spaghettified (wound around, over, under, messy...) with lots of other cabling will help, too. HDMI is a two-way street for power and signal transmission. Cable organizers are a dime a dozen, so making sure your cabling is neat and doesn't create its own electromagnet is a good idea. :)

All sorts of video settings could change EM frequency in some components, so changes there could make this magically "go away." But, if those changes aren't pleasing to you, make sure you're using ferrite core video cabling if you can. (Not sure of the effect on component cabling or even if its available there. For everything else, I've seen a ferrite core on all other standard display cabling, so it's available out there somewhere.)

If it's a "constant" whine that you can't get rid of, which it doesn't appear to be, then you'd start looking at power sources to make sure you're not getting EM leaks/weirdness. A bad "power strip" could contribute to that.

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Morkonan wrote:

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Is it hurting the monitor?

I mean it's life span?

Or it's just a little anoyance..

It's typically just an annoyance. The electromagnetic fields causing the interference are not strong enough to damage anything. It's that certain components are picking up these signals and interpreting them as a sort of "data." OR, in the case of actually "whining coils" the coils are vibrating because they're loose, pick up these waves, and sympathetically vibrate in response, "riding the waves." (AFAIK) Or... "random effect, but with a known cause - EMI." :)

Some instances of this could indicate capacitor issues or other power-supply-related problems. One would expect those to become evident on startup or after an extended use period, either way. If it was constant, the first place to look would be big sources of EMI, like power supplies, transformers and inverters (Conversion of long transmission range AC power to more efficient DC power for system/component use).

IOW - No, the symptoms in the OP are not likely to be indicative of imminent failure. :)