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4 Posts

11-12-2012

Germany

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  • Message 1 of 19

IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2012-11-12, 23:11 PM

First of all, excuse my English. (And after initial posting i recognized that i have selected the false category for this post, should be in "ideacentre"....)

 

A few days before i buyed a used VBT1YGE from Amazon Warehouse Deals. It was important to me to use the A720 as a external monitor for my Lenovo Notebook and my MacBook.

As soon as i connected the Notebook or MacBook with a HDMI-Cable (tried four different cables!) plugged in to HDMI in, there was an annoying noise.

Furthermore, if i adjust the brightness with plugged in HDMI-Cable, there was a new loud noise, it becomes louder by decreasing brightness. Sound works fine from the Lenovo Notebook through HDMI but there is always a noise and if i decrease brightness this results in louder noise.

If i use the VBT1YGE only as AIO PC, everything works fine, no noises.

 

As i said the VBT1YGE was used, so i thought it has a defect and i sent it back to Amazon.

Now i have buyed a new VDT2DGE from Lenovo Shop and i have exactly the same problems.

 

Please, is there any solution for this problem? If not, i will sent the VDT2DGE back in a few days...

 

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2 Posts

11-27-2012

Belgium

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  • Message 2 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2012-11-28, 20:56 PM

i have the same problem like  you with the noise  . You find any solution for it ?  Or have you send him back ?

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374 Posts

02-25-2010

Salem OR

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  • Message 3 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2012-11-28, 23:09 PM

Just a thought.  Since you are both in Europe I wonder if it is related to your power system.  You might try with the laptop on battery not plugged in to a power source and see if it is still there.  If it is not then I'd guess it is something in the power system rather than the computers.

 

Noise in audio is often caused by grounding problems or poor connections.  Hdmi plugs should not have this difficulty but if you are using European equipment with USA equipment for example you might run into something like this.

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2 Posts

11-27-2012

Belgium

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  • Message 4 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2012-12-01, 17:22 PM

I've tried with the laptop on battery  the same noise , with the power system it's all ok . The problem is the computer self.

I think that more users  of Ideacentre A720 have the same problem .

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3 Posts

01-16-2013

Leonberg

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  • Message 5 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2013-01-16, 16:41 PM
Hi, i had an desktop pc to install, same issue after 2-3 minutes the noise starts, switch screen, then it´s ok for more than 2-3 minutes, then the noise starts again :-(
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3 Posts

01-07-2014

England

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  • Message 6 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2014-01-09, 16:37 PM

Hi,

I've just bought an A720 and have the same problem with HDMI input.

Coonect HDMI source and select HDMI - loud buzzing which increases as you decrease the brightness...

Has anyone identified a solution or is this just a feature of the h/w ?

 

Also when using the HDMI input - sometimes the brightness automatically decreaes (and consequently the buzzing gets louder).  Is this a faulty unit or is there some clever circuitry in the monitor which monitors ambient light and then decreases the brightness.....?  If so does anyone know how to configure/disable it ?

 

Many thanks in advance

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4 Posts

03-09-2014

Diamond Bar, CA, USA

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  • Message 7 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2014-03-09, 21:25 PM

Problem still exists, someone from Lenovo please help! Or anyone in the community!

 

Best,

Joey

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2651 Posts

03-21-2012

Malaysia

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  • Location: Malaysia
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  • Message 8 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2014-03-10, 4:28 AM
Hi bighour,

thanks for posting and welcome to the community. I was wondering though are running Win7 or Win8 on your system?

Hope to hear back

Regards
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4 Posts

03-09-2014

Diamond Bar, CA, USA

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  • Message 9 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2014-03-10, 5:16 AM

I am running Windows 8, which came with the system. I decided to "Remove everything and reinstall Windows" and this is the specs that I see now. Windows 8, Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz 2.50 GHz, 6.00 GB RAM, 64-bit Operating System, x64-based processor.

 

By chance I found out that if I force my screen to sit up right, by pushing the backbone of the screen backwards, the noise becomes smaller. I also now changed my refresh rate to 50Hz to make the noise a little bit lower in tone. I was hoping that this is fixable with an update with graphics card or with a lenovo diagnostic software, but I could not find anything online similar to it. The problem still exists, although now it is more acceptable. Still hope that it can be solved.

 

Thank you very much for replying!

Joey Ma

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4 Posts

03-09-2014

Diamond Bar, CA, USA

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  • Message 10 of 19

Re: IDEACENTRE A720 serious problem with noisy hdmi in and brightness control

2014-04-01, 4:40 AM
Hope to hear back.
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