[mythtv-users] Eliminating a ground loop/hum

[Dave Hofstra]

Try just using a 3 prong -->2 prong adapter on the PC.  This has worked for
me twice.

On 7/5/06, Owen Mehegan <owen at nerdnetworks.org> wrote:
>
> I have a new Myth system that I've just built. I'm using an MSI PM8M-V
> motherboard, with its on-board audio (Via VT8233/A/8235/8237 AC97) for
> everything. The system is connected to a Sony 34" CRT TV using DVI/HDMI
> cable. Audio is routed as follows:
> cable box -> myth box -> tv -> Sony home theater receiver/speakers
>
> All of that is done via basic RCA cables. My problem is that I have an
> intermittent 60hz hum in the audio. I hear it whether I'm watching TV or
> just in the Myth interface. Playing with various mixer volumes doesn't make
> it go away, in the sense that I can't null it out without having the whole
> system's volume down too low to hear anything. I have everything plugged
> into one power strip/wall outlet, and the outlet has three prongs; whether
> it's really properly grounded or not is anyone's guess. I tried unplugging
> various unrelated components (Xbox, cable box, cable modem/router) and got
> no change.
>
> So, any suggestions on what I should do to clean up this audio? Maybe buy
> a better sound card? (And use spdif out while I'm at it? My receiver can
> handle it, though it's a pain in the ass from a "management of the available
> inputs" perspective.) What if I bought a UPS and plugged everything into
> that? I've seen suggestions of "home theater" magical grounding thingys...
> if you think one of those would help, a link to a specific product would be
> sweet. Thanks!
>
> --
>
> owen at nerdnetworks.org (Owen B. Mehegan)
>
> 'Therefore, since brevity is the soul of wit,
>
> And tediousness the limbs and outward flourishes,
>
> I will be brief.'
>
>   --William Shakespeare
>
>
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>
>
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