[mythtv-users] audio issue - HDMI tv

Tim Draper veehexx at zoho.com
Tue Apr 3 07:23:10 UTC 2018

 ---- On Fri, 30 Mar 2018 19:35:21 +0100 Michael A Weber <mweberjunk01 at gmail.com> wrote ---- 
 > On Mar 30, 2018, at 10:38 AM, Tim Draper <veehexx at zoho.com> wrote:
 >  ---- On Mon, 26 Mar 2018 16:08:35 +0100 Mike Carron <jmcarron at gmx.com> wrote ---- 
 >            This sounds like a classic case of a ground           loop. Resolve it and the noise should disappear.
 >      mike
 > Looks like you might be right. tried using my laptop with DP>HDMI adapter and the same problem occurs.
 > Touch the ground of HDMI cable to any metal part of the TV and the sound occurs so definitely ground induced.
 > what options do i have to fix it? seems like internal TV issue and not fussed enough to resolve the issue to go buy a new one. Can i simply run a wire from a ground point down to the mains socket earth pin (3pin UK; green/yellow)?
 > mains connection is 2way wall socket > with 1 of the sockets to a 6way extension. all the kit connects to the 6way; tv, amp, rpi, laptop etc.
 > could a faulty mains socket cause this, or is it device issue?
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 > There are several of these available, and I know there are some available with RCA ends on them because we used them occasionally in car audio applications.
 > It’s an unfortunate thing when different equipment (and, in this case, I’ll blame the Lepy amp) decide on how they will implement chassis ground differently, and that’s the case here.  We don’t hear of TVs and home receivers having issue, so I’m going to blame the Lepy amp for sure.  However, an isolator like this should do the trick.
 > It’s a cheap trial if it doesn’t work, anyway.  Good luck!
 > https://www.amazon.com/Mpow-Ground-Isolator-Stereo-System/dp/B019393MV2/ref=sr_1_1_sspa?s=electronics&ie=UTF8&qid=1522434713&sr=1-1-spons&keywords=ground+loop+isolator&psc=1
 > Mike

i was actually looking at something like that last night.  My experience of isolators in car applications haven't been worth squat however. My dad thought about an optical to RCA DAC.  It'll definitely isolate.

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