[mythtv-users] audio issue - HDMI tv

Daryl McDonald darylangela at gmail.com
Mon Mar 26 19:17:47 UTC 2018

On Mon, Mar 26, 2018, 8:17 AM Tim Draper <veehexx at zoho.com> wrote:

>  ---- On Mon, 26 Mar 2018 12:36:07 +0100 John Pilkington <J.Pilk at tesco.net>
> wrote ----
>  > re-sent to list: probably not as good as fixing a cec issue...
>  >
>  > On 26/03/18 11:44, Tim Draper wrote:
>  > > While strictly not a mythtv issue, it is to do with one of my FE
> setups.
>  > >
>  > > my conservatory has in-floor speakers by the previous owner and
> figured i could use them with an external amp (ebay/amazon Lepy T-class
> amp). This works fine from my phone/laptop.
>  > > It doesn't work when i have the 3.5mm jack connected to my rpi3 AND
> is connected to the TV with HDMI cable. even with the rpi3 unpowered, the
> lepy amp seems to see some sort of fault and (i think) enabling & disabling
> itself every few seconds. - internal relays clicking and speaker popping as
> it switches. disconnect either end of the HDMI cable form the rpi3 and the
> issue goes. Plug rpi3 power in and problem remains. swapping HDMI cable has
> same effect.
>  > > problem occurs both on the rpi3 3.5mm jack and a USB sound card.
>  > >
>  > > i'm not really sure exactly what or how, but something in the TV is
> upsetting the external amp. happens with the tv on, soft-off, or turning
> the physical switch on the side of the tv off. only way to stop it is to
> physically unplug the mains cable.
>  > >
>  > > TV is a 2009-era LG 32".
>  > > Is this a case of i'm outta luck or is there something i can do to
> stop it? I've tried to disable the tv speaker via the menu and cant see
> anything else in there that could help.
>  >
>  > If your tv can get audio via hdmi, can you feed your amp from a tv
>  > headphone socket?
>  >
> didnt think to try that; noise still present though when using HDMI audio
> to the TV, and then using headphone socket on the TV to the lepy amp.
> use headphones on the TV headphone port no issues.
> at this point it kinda points towards the lepy amp, but it acts fine if i
> use any other device with it; laptop, the same USB audio dongle on laptop,
> mobile phone, disconnect the 3.5mm cable from tv/rpi3.
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Are you set up for simultaneous output to HDMI and line out?

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