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Old 08-23-2014, 10:57 AM   #1
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On/off buzzing noise from TV

Swapped campers in May and brought along my digital box as my newer motorhome didn't have one and I assume the previous owner just took it out for use in his new RV. When I turn the TV on and use the digital box and TV antenna I get an annoying buzzing sound that sometimes is loud, sometimes not as loud and sometimes not at all but it changes by the minute. I can't recall having as much of a buzzing noise in my old motorhome. If I play a DVD or am hooked up to cable TV everything is fine. I have tried turning off different things but nothing helps. Should I be looking at replacing my digital box or can I buy some kind of plug in noise filter? Anyone have any suggestions?? Thanks in advance..

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Old 08-23-2014, 05:36 PM   #2
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I'm not sure what digital box you mean? Is your TV one of the old "before digital" or analog sets that requires a converter and that is what is buzzing?

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Old 08-23-2014, 05:49 PM   #3
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Do both the TV and the digital converter have 3-wire plugs?

If so try this .. On one of them (The box if it's plastic cased would be my choice, or the tv if all exposed parts are plastic) use one of those 3-prong to 2 prong adapters DO NOT attach the ground tab to the outlet.

Just a hunch. but you have described a ground loup.

Also, check all cable connections.. The other thing that can cause that type of thing is an open shield, most likely between box and TV.
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Old 08-24-2014, 11:16 AM   #4
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I may be way off on this, but are you sure the TVs in the new rig are not digital and don't need the digital box?
2006 Sea Breeze LX 8341 on a Workhorse W22 Chassis with 22.5 Alcoa Alum wheels,
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Old 08-24-2014, 11:29 AM   #5
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Thank You to all who have replied to my question. The TV I believe is the original one for the unit (2003 Holiday Rambler) so it was made before digital and my box is the one that I got when the change over from analog to digital happened. My cables going to the TV from the converter are the old standard coax kind. While watching this TV late yesterday afternoon I discovered something that really has me baffled. I made this discovery while watching golf... when the network put a caption up on the screen like the players name and what his score was the buzz started. Just before commercials they would put the leaders scores up and it would buzz. While watching the news if they showed the reporters name it would buzz. It seems anything that had any kind of caption on the screen would make it buzz. If there was no caption then everything was fine. I tried the 2nd TV in the bedroom and I have a little constant static noise but no buzz. If I'm hooked to cable everything is fine. I just don't get what is causing this....
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Old 08-24-2014, 12:09 PM   #6
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OH, that is something called WHITE CATCH.. And alas it is the broadcaster's fault. Not a lot you can do about it.
The other term for white catch is "Overmodulation"

I noticed that often back in the analog days of Teleision.. Alas, broadcast engineers do not take as much pride in their jobs as they used to.. I would never crank the wight up to 110 percent. Black yes, but never white (Blacker than black simply means no power is transmitted, but whiter than white makes trash)

Alas.. To explain farther I'd have go way too far into how TV works.
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Old 08-24-2014, 12:28 PM   #7
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Just to eliminate a possibility, turn off all florescent lighting and see what happens.

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