New Olevia 337h 37" LCD HDTV has a hum coming form the speakers.

[coolred]

When I have either my tivo or cable box connected by the right and left composite audio connections, I have a hum coming from the TV speakers. It increases in loudness with the volume. I am pretty sure its a problem with the tv, since it happens with both my tivo and cable box plugged in. I got it on black friday, so I only have till tomorrow to solve the problem or return it. Any ideas? Thanks

 

[JEDIYoda]

Originally posted by: coolred
When I have either my tivo or cable box connected by the right and left composite audio connections, I have a hum coming from the TV speakers. It increases in loudness with the volume. I am pretty sure its a problem with the tv, since it happens with both my tivo and cable box plugged in. I got it on black friday, so I only have till tomorrow to solve the problem or return it. Any ideas? Thanks

I had a problem with a noise that I thought was my spakers because I didn`t hear the noise with my old speakers.

What I did was I accessed my Crative surround mixer and started by disabling everything. The noise went away. So I eneabled one thing at a time and low and behold the noise returned.....so just disable evrything and thren enable one thing at a time...

Also sometimes disabling your microphone box will solve that issue!!

Good luck!!

 

[coolred]

This is not connected to a computer, its just an HDTV with tivo and cable box connected to it.

 

[YOyoYOhowsDAjello]

Hum can often be an issue with ground loops. Does the issue still happen when you have one of those components attached without the cable line attached to the system? (I'm not sure if your tivo connects to your cable line at all though... directly or indirectly)

Are all these components attached to the same outlet?

Do you have other components that you attach and you don't get the issue (Like a DVD player), or are these the only ones that you tried and they both give problems?

 

[coolred]

Both units are connected to a switch box by svideo(this is just temporary)and composite audio cables. I have attached each without the box and still get the problem. Both the cable box and tivo have a cable line running directly to them and everything is plugged into the same outlet. I have not tested any other equipment, will have more time for that tomorrow. I am using the tivo at the moment, so I can't test it without the cable connected. If I get a chance on a comercial I will try the cable box without the cable line connected.

 

[coolred]

I unplugged the cable into the cable box and the hum did remain, so whats that mean? Ground loop?

 

[YOyoYOhowsDAjello]

Originally posted by: coolred
I unplugged the cable into the cable box and the hum did remain, so whats that mean? Ground loop?

Here's some info on ground loop if you want to look through it
http://www.epanorama.net/documents/groundloop/
(sorry, a couple popups I think)

I only had to really get rid of this type of problem once so I'm not too familiar with the intricacies of it.

Do you have the option of runnning a toslink cable for the audio? I'm not sure and of these components have that as an option, but that would be a good way to try to isolate the problem by having a toslink cable be the only connection you make between the components and TV.

 

[coolred]

Well this weekend I plan to incorporate my receiver into the the setup, but I don't think the tivo ro cable box have toslink outputs. But from what I read of ground loop, "inserting isolation resistor(s) in series with the audio cable ground(s)" can remedy the problem. Just have to figure otu what one of those is an where to get one(radio shack?)

But my main worry is that it was a problem with the TV, as long as I know its not the TV then I can work it out this weekend.

 

[YOyoYOhowsDAjello]

It could very well be a problem with the TV. I would just be worried that you could return it and get a new one and still have the same issues if it's a ground loop problem or something similar.

I don't have enough experience with these issues to try to help you further.

You might want to ask MS Dawn to take a look at this because I'm sure she's had to deal with problems like this in the past.