Anyone with experience\input on HP ZR2440w.

No, but I have a ZR2740W. This is completely silent at any brightness setting. I don't know if this applies to the 2440 as well though. A potentially important difference is that the ZR2740W does not use PWM to adjust the screen brightness - I don't know if the 2440 is the same, but it's apparently rare to find screens that don't use PWM (pulse width modulation is used to rapidly turn the backlight on/off which can result in audible noise).

I bought the 2740 because it doesn't use PWM to dim the backlight and I thought maybe this would eliminate annoying hum from the screen. Seems I was right, although it's also possible I just got lucky with mine - would be really interested to hear from other people with non-PWM screens.

The new Samsung series 9 (S27B970D) apparently doesn't use PWM either by the way (PWM is something tft central have started testing for as standard in their reviews, so if PWM results in a quiet screen that info could really help when shopping around - it's not something manufacturers list in their specs, but it can be tested for).

Can anyone confirm U2713HM buzzing noise?

related: http://forums.overclockers.co.uk/showth ... t=18455034 and http://www.amazon.com/Dell-U2713HM-2560 ... ewpoints=1

I ended up ditching my Dell 20" 2007FP's due to a constant high pitched whine I could never get rid of after slathering nail polish over most components on the inverter.

My Dell 3007WFP-HC is getting less use due to the CCFL inverter buzzing on acceptable brightness levels (mostly goes away at 100%).

I'm now on a Yamakasi Catleap 27" LED backlit monitor that only has a noticeable noise with white backgrounds. This one is supposedly an easy nail polish fix but I just haven't gotten around to opening it up yet. Benefits of this monitor, slightly higher PPI, no warmup time for accurate colours, almost dead silent, barely heats up the office.

Asus VW223D It has worked just fine for four year. Restarted my laptop, earlier today, to whom it was connected as external monitor for the same period of time. I kept everything on 24/7 , BUT as i said, i restarted laptop and ta dam! No image, only little blue diode on on/of button of monitor blipping and OF COURSE a very very silent whine from behind of the monitor. It is coming from behind near the upper edge and little bit on the right when you turn backside to the front. After little while even a little blue lamp stopped.

I think it's the end of it...

I can confirm the buzzing with the u2713hm. Otherwise it's a BRILLIANT monitor - no PWM backlight, tons of inputs, beautiful display, light AG coating, regular gamut.

<sigh>

I'm on my 3rd, and they all buzz.

I have a NEC Spectraview PA271W which has an annoyingly audible high pitched hum. My NEC2690 had a hum too, though not my NEC2490/2. I've been putting up with the hum because the display is wonderful to work with but it's beginning to get to me.

Does anyone know what causes the hum and whether anything can be done about it? Does anyone know of a colour accurate 27inch display that never hums?

Thanks.

Try changing brightness level. If that doesn't help, try changing contrast level next.

Thanks very much - that was the answer. When I increase the brightness to 120cd/m2 the buzz goes completely. Now I need to try different calibrations in small increments below 120 to see how close I can get to 80cd/m2 without the buzz becoming too intrusive. It's a bit bright at the moment. But it's great to have a solution. Thanks again.

PS - this 120cd/m2 is beginning to fry my eyeballs...

PPS - didn't last, hum's back even at 120cd/m2.

Fujitsu Siemens
Scaleoview L22W1GT or D22W1GT
Dropped the brightness to improve in game visuals, noticed whine.
Can hear whine between 8% and 93% increases toward the middle of the range so stuck with very dim or over bright.
Doesn't respond to changes in contrast or colour temperature.
Settled on Warm, Brightness 8%, Contrast 75%.

Thanks for this thread, will use it next time I'm looking for a screen!

AOC 12367f

Just took delivery of this today. Quiet on all brightness settings.

With my ear touching the screen (the top of my ear is in contact with the display, to be precise) there is a faint medium frequency hum. Inaudible at >5-10cm away.

Is this as good as it gets?

Samsung 2333HD

Audible hum at normal sitting distance at all brightness settings below 100%.