Return to the Electrical Wiring Forum | Post a Follow-Up

 o
Is this a bad sign?

Posted by catherinet (My Page) on
Thu, Mar 18, 10 at 19:17

I noticed last week that when I flip the kitchen light on and off, the TV in the kitchen loses its sound for a second.
Tonight, while using the electric mixer, I lost the total signal for the TV. (We have a digital converter box).
Does this mean we have an electrical problem or is it just interference with the digital reception on the TV??
Thanks.


Follow-Up Postings:

 o
RE: Is this a bad sign?

It is most likely interference. The converter boxes are not shielded.


 o
RE: Is this a bad sign?

Thanks maryland irisman.


 o
RE: Is this a bad sign?

If your house is relatively new, the lighting circuit for the kitchen should be completely separate from any of the outlets. If you can verify that, then you would be 100% certain that it is just interference with the converter.


 o
RE: Is this a bad sign?

The digital cable TV boxes are ridiculously picky about grounding.

They ARE shielded. They're built in sheetmetal cases. Problem is the 'shield' is only grounded to the coax shield, which needs to be very well grounded in and of itself.

The loss of audio/signal is just the box's response to "garbage" on the line, which is, as suggested, interference - and that's only having an effect because of the condition of the cable or the ground.


I went through this in an old house I lived in. Shortcuts and cheats I had "gotten away with" for years with analog cable tv just didn't work with the digital stuff.


 o
RE: Is this a bad sign?

She has a digital converter box, not a cable box. The digital converter boxes are not shielded. Those that are, are minimal at best.


 o
RE: Is this a bad sign?

Thanks everyone.


 o
RE: Is this a bad sign?

You're welcome catherinet.

Pharkus...I'm sure you saw another thread in this forum where the poster was looking for advice on who to get to install home theater and a speaker system. I wonder how many are out there right now with the same scenario you mentioned? I was in a house not long ago for a different reason but I saw their tv antenna wire was telephone station wire and no ground at all from the outdoor antenna!!


 o
RE: Is this a bad sign?

maryland_irisman, yes, I saw that thread. I participated in it.

Almost all "between the source and the tv" boxes I've seen are "shielded" to the coax shield, so my advice on this particular thread/problem, despite the exact nature of the device, is to ground the coax properly, assuming the antenna isn't just one sitting on top of the tv - in which case, I'm in agreement that there isn't much that can be done (other than installing a properly-grounded outdoor antenna)


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here