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Buzzing when no sounds play over HDMI connection

By OrangGila
Mar 10, 2015
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  1. Okay so I've read the other threads and figure that...well...I figured nothing.

    Audio sounds great. It's from my gigabyte motherboard, not from an expansion card. I have a jumper cable running from my mobo to my video card for the audio signal. When there is no audio playing on my computer, there is a sort of static buzz that has what seems like a specific rate to it... "blip blip____blip blip___blip blip"..... sort of like that

    All inputs/recording settings have been disabled.

    The only fix I have is to basically open an app (winamp) and have it play audio at 0% volume. It's kind of stupid and would prefer to not have to do this. Any advice would be appreciated. Thanks.
     
  2. jobeard

    jobeard TS Ambassador Posts: 9,315   +618

    That's the norm for HDMI. HUMMMMMM or other noise when no sound is being produced intentionally is usually a grounding or cable shielding problem.

    To be honest, my laptop HDMI is iffy; by that I mean, a connection to the HDTV at home and at one auditorium is just fine, but at another location, I get hum all the time both with and without sound originating from the laptop - - using the same hdmi cable.

    The laptop has a plastic case and of course can not be shielded and therefore subject to 'environmental' interference'

    In normal audio circuits, a/c hum indicates poor or no shielding (ie grounding) OR
    the leads on the audio cable are reverse - - the ground on the cable is wired (by mistake) to the audio hot lead (ie the input).

    On your PC, make sure you have a grounded A/C power cord and the wall plate has an active ground connection.
     

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