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5 Posts

05-07-2017

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Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-05-07, 18:44 PM

I recently bought Ideacentre 300-20ISH Desktop PC and when connecting any headphones to front headphone jack there is constant static noise in behind. Static becomes even more vivid if PC is active (hdd copying, audio-video editing, etc,..) Direct output in the back of the PC works fine. But I don’t want to do disconnect/connect my speakers every time I want to use headphones. Installed OS is Windows 10.

Can someone please suggest what to do?

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180 Posts

11-28-2016

GB

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-05-08, 10:06 AM

Hello jesprej

 

Thank you for using the Lenovo forum

 

What i suggest trying is a static discharge of the unit as this may be all it is. below is some steps for this.

 

To discharge static that may have built up inside your machine follow the steps below:

1. Plug the cable into the socket and the machine.

2. Turn power off at the wall.

3. Hold down the power button on the front of the machine for 1 minute

4. Turn wall socket back on.

5. Turn machine back on.

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5 Posts

05-07-2017

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-05-08, 19:42 PM

Hello Crosspython6022,

 

thank you for fast reply and suggested solution.

I tried the procedure on three different wall sockets but unfortunatlly the static still persists.

Could it be that there is some electrical interference or maybe a grounding issue that is affecting front jacks? 

Some online research is showing that there might be a problem that audio jacks and usb are sharing the same grounding. But I want to avoid opening front connector panel just for that. It's a new computer and this kind of problem shouldn't be present really.

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5 Posts

05-07-2017

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-05-12, 6:57 AM

Let me clarify what kind of static sound I have in mind:

It’s whining noise which varies. You can hear HDD accessing, mouse movements, scrolling etc.

 

Because this static/EMI sounds are annoying as hell I did open front connector panel and picture 1 is showing how it looks like. By this we can rule out the problem of common USB/Audio/CarReader grounding.

 

After further investigation I tried to connect each of those connectors separately. 

Results:

  • Only audio connector (orange) connected to MOBO: annoying sound disappears
  • Audio connector + CardReader: A little static is back
  • Audio connector + CardReader + USB: Annoying static/EMI is completely back

So the next step is to discover if there is a solution to ground these USB connectors. But since I’m not an expert I would request some help on what exactly to ground? Anyone?

 

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05-07-2017

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-05-13, 10:43 AM

After deep state of mediation (i.e. a beer or two) a solution emerged.
I figured that source of annoying static/EMI sound should either be on MOBO side or connector side.
If it’s the MOBO there is really nothing to do, but since all MOBO connectors are so far apart it’s more likely to be on connector panel side. And that lead me to thinking that something is touching each other which actually doesn’t want to. And voila/eureka/bingo/bazinga THE solution:

 

Before:

As you can see it was a common grounding problem, where Audio connectors should not be connected to metal casing. Nothing that a little insulation tape couldn’t fix.
I hope this will help someone with similar problem.

0 person found this solution to be helpful.

This helped me too

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15 Posts

11-29-2017

US

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-12-10, 19:23 PM

Thanks for great tip! 
Working and cost-effective solution for static noise reduction for Headphones output on front panel of Lenovo Ideacentre 300-20ISH Desktop.

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11-29-2017

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2017-12-19, 0:46 AM

This time with blue insulating tape to cut EMI noise from front panel audio connectors (Headphones, Mic):

 

Sound from headphones is crystal clear and LEDs indicate that my Lenovo Ideacentre 300-20ISH is filled with the Force now:

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1 Posts

08-20-2019

RO

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Re: Front headphone jack static noise (Ideacentre 300-20ISH Desktop)

2019-08-20, 13:08 PM

I have the exact same problem on 710-25ISH and i'm going to try this solution !

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