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Can't get rid of buzz sound with HDMI

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Old 08-05-2006, 05:42 AM   #1
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Default Can't get rid of buzz sound with HDMI

About a year ago, I posted questions in this forum concerning a buzz sound I have been getting when using my HDMI cable connection. I still have the problem, so I thought I would try here again. I have a Sony Wega KDF-42WE655 tv. Road Runner (Time Warner) is my provider. Also, I am using the Explorer 8300HD cable box from Scientific Atalanta with an AT8400 AllTouch Remote Control from Scientific Atlanta. I have no sound problems when using component cables to watch tv stations. There are also no sound problems when watching VHS tapes or dvds. However, when I watch tv programs using the HDMI cable connection (HDMI cable is made by Radio Shack), there is a very noticeable buzz sound, which gets louder as I increase the volume. Since controlling the volume using the volume control for my cable box does not seem to change the volume, I control the volume using the volume control of the tv. Also, the buzz sound I hear is not the sound of the tv fan. Also, I tried adjusting the cable box audio settings with my cable remote. I have been using the HDMI setting. The only other audio setting I can adjust is the audio level. I still get the buzz sound if I set the audio level to zero or to 100 (maximum). Also, adjusting the audio settings of the tv (not many to adjust) did not remove the buzz sound.
I noticed the buzz sound when I first got the tv. To track down the problem, I got replacements (exchanges) for the tv, cable box and the HDMI cable. Still the buzz sound remained and it has continued up until the present.
1) Do you have any suggestions as to what could be causing this problem and how I can fix it?
2) Is it posssible that my HDMI cable from Radio Shack is different from a more expensive HDMI cable?
3) Is it worth trying a different brand HDMI cable to see if that would fix the buzz sound problem?
Thanks.
Richard
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Old 08-05-2006, 03:43 PM   #2
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Try a different cable.
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Old 08-05-2006, 08:09 PM   #3
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Get the HDMI input selected then try unplugging the HDMI cable at the source and the TV and see what happens to the buzz. If the buzz is present with the cable unplugged at the TV, there is something wrong with the TV. If the buzz appears when the cable is plugged into the source box, there could be a ground loop happening. Since i don't know of any ground isolators for HDMI if that's the problem, I wouldn't know where to go next.
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Old 08-07-2006, 06:19 AM   #4
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Do what rbinck said to see where its coming from.
If it is the cable and cable hookups are known for ground loop problems, you get a cable isolator to fix it. The local cable company will give you one or Jensen has one for $60ish that works fine. It goes between the cable in feed line and the box to eliminate the ground loop. I run one of these for the same hum, or buzz you are having!! But some TV's have a power supply buzz and you must check that out first!!
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Old 08-07-2006, 07:50 AM   #5
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With the HDMI input selected and the HDMI cable connected to the cable box - if I unplug the HDMI cable at the tv, the buzz stops. With the HDMI input selected and the HDMI cable connected to the tv - if I unplug the HDMI cable at the cable box, the buzz stops.
1) Does this point to needing a new HDMI cable or a cable isolator?
2) Will a cable isolator degrade the picture or sound when using high definition, component cables, dvds or videos?
Thanks again for the help.
Richard

Last edited by Doowopper; 08-07-2006 at 07:56 AM..
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Old 08-07-2006, 12:29 PM   #6
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Some additional information to add to my last response. I tried a different HDMI cable - bought the most expensive Monster HDMI cable. The buzz is still there - the cable is going back.
Richard
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Old 08-07-2006, 06:44 PM   #7
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There is something wrong with either the input of the TV or the output of the cable box. The TV could be checked by connecting a DVD player to the TV via the HDMI connection. If the buzz is still there, I'd suspect the TV. If not, I'd suspect the cable box.

I don't know of any HDMI islolators.
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Old 08-08-2006, 03:33 AM   #8
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Hi Rbinck,
I don't have a dvd player with an HDMI connection. Is there another way of running a test to disitnguish between the cable box or the tv as the culprit of the buzz sound through my HDMI connection? When the buzz sound first started about a year ago, just after I bought the tv, I had the tv replaced and the cable box replaced. Nevertheless, I still had the buzz sound.
Thanks again for your help.
Richard
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Old 08-08-2006, 09:14 AM   #9
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The ground loop if it exists and chances are real good has nothing to do with the HDMI connection and they dont make a isolator for it.
Cable TV and Sat are suppose to be grounded to the same place your electric is.
Its hard to explain ground loops, but due to 2 prong connections and cable being grounded to house ground this loop is created. And since the receiver is also 2 prong and its hooked to the 3 prong TV, its creating a loop there also. If you break the ground using a isolator on the incoming feed of the cable or Sat, this wont happen. Doesnt have to be on the HDMI connection nor would you want it to be since you have connections from the TV and box to the TV making it compound. Just isolate the cable feed, believe me, if thats the cause, its gone!! My cable company gave me one for free since I had buzz and hum both through my speakers and my sub due to cable. If you cant get on Jensen makes the best one that covers the whole frequency range which cheaper ones dont!!!!

You can even google some make yourown ones to try out. They use 300ohm to 75 ohm cable connectors backed rear to rear or something like that!!
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Old 08-08-2006, 11:54 AM   #10
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If it is the cable causing the ground loop you could unhook the cable feed to see if it goes away. if it does, then getting a cable isolator would do it.

Also you could try unplugging the cable box from the wall to see if that stops it. If the unplugged cable box causes the hum to go away, then a line isolator would probably get rid of the hum. Also you could try a jumper wire between the TV chassis and the cable box chassis.

When you have a component causing a ground loop it can be very difficult to isolate where the problem is.
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Old 08-08-2006, 12:12 PM   #11
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Quote:
Originally Posted by rbinck
Also you could try a jumper wire between the TV chassis and the cable box chassis.
Cant do that!!! That would introduce more of a ground loop problem!!!!
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Old 08-08-2006, 05:00 PM   #12
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We are talking testing here. If no change then we would know the source of the ground loop is the cable box or TV. If it goes away, which it could, then we have cancled out the ground loop by introducing another one. Gets louder then there may not be a ground loop and the STB is leaking the hum in.
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Old 08-09-2006, 01:11 PM   #13
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To refresh your memory on the basic problem: I have a buzz sound when using the HDMI connection to watch tv programs. There is no buzz sound when using the component connections to watch tv programs or when I use the dvd and VHS connections. Here are my latest tests based on some of your responses - while watching tv programs via the HDMI connection:
1) I replaced the cable box - still had the same problem - a buzz sound.
2) I added a cable isolator - still had the same problem - a buzz sound.
3) I replaced the HDMI cable - still had the same problem - a buzz sound.
4) I unplugged the HDMI cable from the cable box - the buzz sound disappeared.
5) I unplugged the incoming cable line from the cable box - the buzz sound continued.
6) The buzz sound varies in intensity at various times during the day. Sometimes it is loud and sometimes it is less loud.
So, the cable line does not seem to be the problem, as in test 5) above, so perhaps the buzz sound with the HDMI connection indicates a problem with the tv or the connection where the HDMI cable connects with the tv, if I am correctly interpreting the results of the above tests.
Based on the above tests, could the buzz sound problem be in the tv - perhaps the receptor on the tv where the HDMI connects to the tv?
If the answer to 1) is yes, I would be very surprised if the tv is the source of the problem. When I first bought the tv about a year ago, I immediately noticed the buzz sound when using the HDMI connection. I then had the store give me a replacement tv, thinking that the problem was with the tv. The same buzz sound happened when using the HDMI connection with the replacement tv.
Thanks again for your help.
Richard
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Old 08-09-2006, 04:42 PM   #14
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Well you are down to getting some other way to connect a HDMI signal to the TV for testing. Otherwise, hook up the stereo audio and enjoy hum free sound. Have you tried hooking up the analog audio on the HDMI in?

Last edited by rbinck; 08-09-2006 at 04:46 PM..
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Old 08-10-2006, 03:58 AM   #15
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Quote:
Originally Posted by rbinck
Well you are down to getting some other way to connect a HDMI signal to the TV for testing. Otherwise, hook up the stereo audio and enjoy hum free sound. Have you tried hooking up the analog audio on the HDMI in?
Hi Rbinck
Sorry for my naivete about all of this - please bear with me for the following questions:
1) Are you "saying" that my tests (previous post) have not yet pinpointed the cause of the buzz?
2) Any suggestions for connecting another HDMI signal to the tv without buying an HDMI piece of equipment, such as, an HDMI dvd player? Maybe there is there is a way that I am overlooking.
3) How would I hook up the analog audio to the HDMI in? As you know, the one HDMI cable carries both the audio and video, so I am unsure how to get analog audio from the HDMI in.
4) Likewise, how do I hook up stereo audio and overrride the audio signal coming from the HDMI connection?
Thanks again.
Richard
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