[mythtv-users] Humming Noise coming from LCD tv

[John Pilkington]

On 01/04/14 12:32, Mike Perkins wrote:
> On 01/04/14 11:45, Sam Jacobs wrote:
>>
>>
>> On 1 April 2014 at 08:36:15, John Haywood (john at jhit.com.au) wrote:
>>>
>>> On 1 Apr 2014, at 8:25 am, Philip Isaacs wrote:
>>>>
>>>> Okay, so this is slightly off subject, but I've hooked up my Myth PC
>>>> to my LCD TV via a DVI
>>> to HDMI adapter. I then ran a single audio cable from the sound card
>>> on the PC into the audio
>>> port in the back of the TV. The picture looks great but there's a
>>> annoying hum coming from
>>> the TV now.
>>>
>>> I have a question - can you not just use sound over hdmi and cut it
>>> the sound card?
>>
>> Not using a simple DVI to HDMI adaptor, as DVI doesn’t carry audio.
>> There are adaptors about that can accept analogue or even digital
>> audio and integrate that into the HDMI signal, though, which could
>> work around the OPs problem. Digital audio almost certainly would.
>>
>> Sam
>>
>>
>>>> It's pretty loud too. I tried switching out the cables but I'm
>>>> having no luck. Any suggestions
>>> on how to fix this? I know it's not exactly Myth related but I'm
>>> guessing maybe others have
>>> run into this issue.
>>>>
>>>> Floyd
>>
> Wrong there. DVI *can* carry audio to an HDMI connector because I have a
> host set up that way.
>
> I don't use it for myth, though, but as a quarantined unit connected to
> my ISP's router and it just runs basic Debian and Skype.
>
> The choice of video outputs were DVI and VGA. I got it working using VGA
> and an audio cable but the video quality was poor, so I switched to a
> DVI-to-HDMI adaptor and an HDMI cable.
>
> To my surprise it runs audio as well so that's what I finished up with.
>

Hmm.  I don't think mine does, but I Googled dvi pinout audio and it 
seems YMMV.  Wiki says:

> So, DVI-D devices output HDMI signals, many including audio, (examples: ATI 3000-series and NVIDIA GTX 200-series video cards),[9] and some multimedia displays input that HDMI signal, including audio, by using a DVI to HDMI adapter. Exact capabilities vary by video card specifications.