[mythtv-users] Resolved: Audio noise

[Dick Steffens]

On 01/23/2015 09:02 AM, Dick Steffens wrote:
> On 01/23/2015 08:49 AM, Jim wrote:
>> On 1/23/2015 11:25 AM, Dick Steffens wrote:
>>> Watched some recordings last evening with the new power supply in 
>>> the system. There is some odd noise that is most prevalent while 
>>> watching recordings. While still present, it's less noticeable with 
>>> live TV. I tuned in a golf tournament so there would be segments of 
>>> quiet program, and I could hear the light buzzing. With the front 
>>> end closed I listened to some music with Movie Player. I didn't hear 
>>> the noise.
>>>
>>> In addition, there is a fairly quiet noise associated with clicking 
>>> the buttons on the remote. There is also a similar quiet noise when 
>>> using the mouse and mouse buttons. Sometimes the noise is there when 
>>> dragging the mouse across the screen. The mouse issues occur when 
>>> the front end is shut down. I imagine they would be there with the 
>>> mouse in use, too, but since the mouse isn't used with the front 
>>> end, I didn't notice.
>>>
>>> It doesn't make sense to me that a program could cause the problem, 
>>> but I'll ask anyway: is there anything in MythTV that could be 
>>> involved in creating this noise?
>>>
>>> My assumption is that when I put in the new power supply one of the 
>>> cables is now somewhere it wasn't before. I'll open it up again this 
>>> afternoon and see if I can reroute things.
>>>
>> 1. Is it coming through the speakers or is it a mechanical noise from 
>> the cpu.
>
> Speakers. I can mute the stereo and the noise stops.

After much fiddling with cable placements the noise went away. I had the 
computer sitting up on the table on which the TV sits, and had that 
table pulled away from the wall a bit. With the computer running, and 
the front end running, but with both the TV and the stereo off, I 
started moving things around to tidy up a bit. While moving the computer 
I heard a buzzing from inside the case. It was repeatable. I discovered 
it was the Ethernet cable. It looped around some power cords. The loop 
was around six inches. I could move just that cable and get the noise to 
go away and return. I disconnected that cable, unlooped it from around 
any other cables, put it back in, and made sure it was several inches 
away from other cables, plus crossing them at 90 degrees. This stopped 
the noise.



-- 
Regards,

Dick Steffens