Humming sound when TV connected to PC via

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changhiskhan

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Feb 27, 2014
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4,510
Hello,

I've recently connected a TV to my PC via HDMI (located close to each other) and now my PC speakers (Klipsch Promedia) make annoying humming sound every time my TV is on. The humming noise goes away when my TV is off so I know for a fact that it's the TV causing this humming noise. I researched this a bit and i ran across this thing called "ground loop". Do you think my situation is effected by the ground loop issue? I tried plugging the TV to a different outlet than my Klipsch Promedia and it doesn't seem to help. Any advise would be greatly appreciated!
 
Solution
nukemaster
Ground loop isolators are almost always transformers, but sometimes they use capacitors to filter out the noise. This is just a link from Google. Local stores should sell some as well

http://www.amazon.com/s/?ie=UTF8&keywords=ground+loop+isolator&tag=googcana-20&index=aps&hvadid=8183190826&hvpos=1s4&hvexid=&hvnetw=g&hvrand=2068872852191016210&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_8gcq2cgzcp_b

And yes, I mean it goes between the computer and the speakers(amp). Some users place it after the amp and wonder why it does not work right.

The reason to check out reviews is not all of these isolators are built with the same quality.

When you looked into ground loops I am sure you say ground lifting(removing the third prong from one or...
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
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74,965
A common source of this issue can be the coaxial cable if you have cable(even if it is using a cable box.).

Try to disconnect that and see if it goes away. If it does, sometimes a cable tech can fix it or in worse cases, you need an isolation transformer(breaks ground loop).

If not, you can buy a ground loop isolation transformer for the audio signal it self(at line level, not speaker level). It would go between the computer and the speakers. Please read reviews on any you want to buy as not all are created equally.
 
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changhiskhan

Reputable
Feb 27, 2014
2
0
4,510


Thanks for your prompt response. I currently do not have any coaxial cable connected to my TV.
Sorry to trouble you, but could you link me to an example of a "ground loop isolation transformer"? I also don't understand what you mean by "at the line level, not speaker level". Do you mean that this "ground loop isolation transformer" will be situated between my PC and the speakers? My Klipsch speakers plug into back of my PC by front and rear headphone-like jack (3.5mm i think). Could you elaborate little bit more?

Thank you in advance!
 
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
6
74,965
Ground loop isolators are almost always transformers, but sometimes they use capacitors to filter out the noise. This is just a link from Google. Local stores should sell some as well

http://www.amazon.com/s/?ie=UTF8&keywords=ground+loop+isolator&tag=googcana-20&index=aps&hvadid=8183190826&hvpos=1s4&hvexid=&hvnetw=g&hvrand=2068872852191016210&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_8gcq2cgzcp_b

And yes, I mean it goes between the computer and the speakers(amp). Some users place it after the amp and wonder why it does not work right.

The reason to check out reviews is not all of these isolators are built with the same quality.

When you looked into ground loops I am sure you say ground lifting(removing the third prong from one or more 3 prong devices in your system) as an option, but it is NOT recommended.
 
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