high pitched whine lcd monitors quotation

Hi. What you are experiencing is a form of coil whine. Try messing with the monitor settings in the included monitor on screen controls. You mentioned adjusting brightness on a previous monitor. Did you have any luck adjusting the brightness on this monitor?

It looks like your monitor has multiple inputs and an external power brick. I would try switching to a different hdmi port and moving the power brick as far away as possible. It may be your power brick that is emitting that harsh noise, and not the monitor itself. Try another power brisk. You can try listening to the power brick when unplugged from the monitor to see if it emitts that specific noise. This is not the most scientific test, as the brick is not under load when unplugged from the monitor, so it may not produce a coil whine at all. If it does, find a replacement / RMA from samsung.

The high pitched noise from many LCD monitors when their brightness is reduced can be utterly distracting. Here’s a simple workaround that can work quite well with most monitors for many users. Also, please participate in our Quiet / Noisy Monitor Survey!

Many computer users have run into the issue of whining LCD monitors. Usually, it does not occur when the monitor is set to full brightness, which is usually too bright for most users. The natural response is to turn the brightness down using the monitor’s controls. That’s when the monitor can start to emit some high frequency tones, which are described most often as buzzing or whining. The noise usually gets worse the more the screen is dimmed.

It can be piercing and annoying enough to overcome even relatively high ambient noise. If you’ve spent the time and effort to study the information on SPCR and managed to achieve super-quiet performance in your computer, this whine can be absolutely frustrating. In short, it can drive people crazy.

The source of the problem appears to be components in the electronic circuit which controls the brightness of the CFL bulb that lights most LCD monitors. Most likely, this is some form of PWM (pulse width modulation) circuit, a very useful tool that, alas, can have negative side effects. For example, while it allows a fan to start reliably at unusually low speed, an improperly matched PWM control circuit can cause a DC fan to emit more clicking, buzzing and chattering noise as it is slowed. A similar effect may be happening with the monitor CFL bulbs. To modify this electronic circuit in order to reduce or eliminate the whining noise is an impossible challenge for most users.

This workaround will obviously not work for LCD monitors that whine even at full brightness. A replacement with another sample or model is recommended in such cases. We have not tried replacing the CFL bulb of afflicted LCD monitors; it probably is not the cause, however. Interestingly, the whine of CRT monitors can usually be reduced by setting its internal brightness control down. It’s also not clear whether any LED-lit monitors suffer the same problem. CAUTION: If you are an image professional (or advanced amateur) who relies on color accuracy, this may not be a good solution. For details, please see the discussion in the forum linked below. If you find the color degradation with this approach to be serious, you may also want to try a combination of both monitor hardware brightness control and video driver software brightness reduction. With a decent monitor, for typical computer uage, you should be able to find a happy compromise between image integrity and aural peace.

Please help us help you! The SPCR staff and lab can only examine and report on a finite number of products. Reader contributions can expand our reach tremendously. Everyone viewing this page has a monitor. In the forum discussion linked above, please post the make and model of your monitor and whether it whines. If it does, describe the degree, nature and conditions. As this log grows, everyone can benefit by using it as a quick reference. When it gets big enough, we will turn it to a table with multiple models, samples and ratings, and keep it uptodate. It will become a highly useful resource for quiet monitor seekers.

We continue to explore the issue of high frequency tonal noise from many computer components. As we approach ever lower noise levels, this electronic whining often becomes critical; in “normal” (read: noisy) computers, it is masked by the noise of fans and hard drives. Power supplies, motherboards and video cards are the other main sources of electronic whine. The whine is often associated with power components, usually capacitors and coils. Poor circuit design is probably at fault; electronic resonances in circuits can cause the components to vibrate or ring, and the whining we hear is directly related to that ringing.

Hello,

I had noticed a high-pitched whine from my monitor while playing the Beta version of a certain game (since the official release, the Refresh rate was lowered).

More recently, I had increased my screen resolution from 1024*768 to 1152*864. Since then, I"ve had a problem with a high-pitched whine. I had lowered the Refresh Rate from 75Hz to 70Hz, which caused the noise to cease... but not permanently. It occasionally recurs and ends later on (sometimes if I turn off the monitor for a few second/minutes); I"ve come to ignore it after a while.

A few minutes ago, the display itself began flickering slightly, and this accompanied by the same whine. As this worried me, I turned down the resolution to 60 Hz temporarily and decided to ask about this.

On a side-note, I cannot bear 60 Hz, considering I spend much time on the computer, likely more than is healthy. =P

I"ve been doing a bit of research on the whine, and was reminded that the last time I checked my monitor"s maximum refresh rate, I was using a lower resolution. My monitor manufacturer"s website does not mention the max. refresh rate for my resolution.


I have come here to ask the following:
- What are the possible causes of this; could it cause permanent damage or lower the life of my monitor? Or is a failing monitor the cause? Is my monitor capable of handling the 1152*846 resolution at 70 Hz?
- Is there any way to calculate maximum refresh rate for a monitor at a given resolution, assuming you have that very data for two or more other resolutions? Or alternatively, could somebody find out the maximum refresh rate for the Daytek DT-95A monitor at 1152*864 resolution?

EDIT: And before anybody starts linking me to Daytek"s website, note how there"s no listing of maximum refresh rate for my resolution.

In normal operating conditions, there shouldn"t be such high pitched noise with monitors. Please connect the monitor to different AC outlet and try to lower the refresh rate.

1. Check the video cables. Make sure the cable is securely connected and if possible change the cable. If using an LCD TV in Video mode, make sure the cable is connected to the correct input.

Hi, I have a Samsung LA22B450 as a second screen, I recently got a new computer and since then the screen makes a high pitched noise, it"s not very loud but it is extremely annoying.

I"ve just  found the solution to an irritating problem with one of my computer monitors that makes a high-pitched sound when the computer is in sleep mode.

A quick Google search showed quite a few people were having this issue with various brands of monitors (mine"s an iiyama) and the general solution seemed to be; "they"re only $100, buy another one".

Well, one idea was that some monitors have a setting to make them turn on faster - when this is on, the lighting component is constantly heated so it turns on faster (doesn"t sound great for the environment!).

I have a cheap LCD that sometimes exhibits this problem (Chimei CMV 938D). For me, the most effective solution is playing with the brightness levels - it never whines at 100% brightness. I"ve always assumed it was the capacitors, though I"ve never been sufficiently motivated to take it apart and investigate.

I"ve had this screen for 2 years now, and it"s done it since it was new, so while it might be an early warning of death, I"ve always just figured it was a function of a cheap build. Admittedly I don"t often run mine in the brightness range where it whines.

On a cheerier note, this LCD let"s you “zoom” in or out on a signal. Want to run a 1024x768 game without any pixel interpolation? Simply zoom out on the signal and you will have the 1024x768 box in the middle of the screen. Counter Strike addicts rejoice!

also, my monitor emits a VERY high-pitched buzzing tone whenever it goes into standby mode. The sound is almost the same thing that happens when you turn on a crt television: an electical tone that is almost to high for the human ear to register.

Although I feel kind of sheepish for not figuring this out before posting this message, I am now even more upset with Dell"s tech support because ANYONE who actually KNEW how to use this monitor could have answered my question out in about two seconds, but instead, I spent 1 hour chatting and 1.5 hours on the phone with tech support people who had apparently never operated or even seen a dell lcd monitor. One tech rep even suggested that the problem was my video card, and that i should go complain to ATI.

When an electronic device like laptop, tablet, phone, etc. is working, sometimes you might hear a “beep” noise and it’s not coming from the speakers or the fans. This kind of high-pitched noise is called “Coil Whine”. It may occur in the design of today"s high-power computer products, and is neither a hardware defect nor affecting the device.

When the system loading changed, the electrical current changes under the low performance of CPU. While the current flows through the electric components inside the laptop, it causes resonance and then high-frequency noise happens. This is the component characteristic, and it won’t affect the hardware.

The coil whine is easier to be heard in a quiet environment, or for the people who are more sensitive of higher frequency sound. ASUS will reduce the noise as much as possible, but this noise can’t be completely eliminated due to this sound is a physical phenomenon produced by normal using a device.

Your hunch is right for switch mode power converters though, they often do sing based on load, most of the time a higher load being the problem (more current means more magnetic field in the coils and more magnetostriction to make things sing). Even this can be confusing though, many converters change their switching frequency based on load and in some cases can be more audible when at very low loads!

As far as the "brightness" setting goes on most LCD"s these days (LP2065 included) this is really controlling the backlight brightness. You"d think that since they label it as 0-100 that it means 0% to 100% but that is almost never the case. My (weak) understanding is that you can"t really run backlights down to 0%, you can only control them over a certain range of brightness. So "0" often means something more like 50% of full brightness. And yes, with some super bright displays if you work in a dark room "0" is the right setting!

The noise from your CRT monitor could be line whistle, although I"m slightly dubious as line rates on a computer monitor should be higher than a TV unless you"re using a very old 640 x 480 resolution, and well beyond the range of human hearing. The switched-mode power supply is a more likely culprit, I suspect. It could also be a corona discharge (cracked insulation allowing electrons to be sucked in from the air - at 22.5 kv it"s quite difficult to contain electricity). That is usually accompanied by the smell of ozone as the ionised oxygen atoms try to share their remaining electrons more efficiently.

LCD monitors are more pleasant to use as they don"t flicker at a frequency the eye can detect and their geometry is much more accurate, but they can suffer from permanently lit sub-pixels and their gamma varies with viewing angle and cannot be calibrated with tools (including display software) designed for CRTs.