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Interference to different channels by different appliances suddenly Watch

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    My TV has started suddenly getting interference (artifacts and sound spluttering). I first noticed it on ITV 1, every few minutes the sound would make a quick spurt of a noise due to interference.

    Then when next door was using a weed wacker (I think, or a lawnmower), it would cause some interference on my TV. I also got a bit of interference when, downstairs in the kitchen, someone was using a whisk or maybe the blender.

    Again, all this on ITV 1, I don't think this happened on BBC 1. Edit: I'm now getting random interference on occasion on BBC 1.

    Just now, I turned on my Xbox 360 (plugged into the socket next to the one my extension which my TV is plugged into), and specifically ITV+1 (or was it ITV 4?) and QVC had major interference to the point the channels were just a hectic garbled mess. ITV 1 and all the other channels I looked at were fine.

    I noticed that there would only be slight interference as my Xbox was booting or shutting down (it takes a few seconds because of messing with cloud options -_-). The major interference comes once the dashboard has loaded after 10 or so seconds of booting.

    I took out the aerial and put it back in all the way, and the channels were somewhat ok. Slight interference still.

    My TV is connected to an aerial outside, no box. Again, this has happened pretty suddenly, not had a problem before. Am I just gonna have to shave and fiddle with the aerial end or is this something else?

    EDIT: Not getting any interference during the afternoon, it must be due to other appliances turning on and being used.
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    Does any other appliance show interference (being interfered) other than the TV?

    It's possible that something in the TV's tuner circuit has a blown capacitor or something in the filter so the passband is wider now (more susceptible to interference). Unfortunately if that's the case there's nothing much you can do besides getting the TV fixed. What kind of TV is it?

    Channel-dependence could be because some channels are weaker than others (so the tuner works at higher gain, also amplifying the noise). Deterioration over time suggests hardware failing in the TV.

    Since the interference comes from many sources, it's unlikely that the problem is anywhere but the TV.

    The aerial could be broken also of course... maybe try a new one? (Sorry I don't know how expensive they are since we don't use them in our part of the world)

    You can also try covering various parts of the TV and/or the aerial with aluminum foil, and see if that changes anything.

    It makes sense that the XBox affects it more since the interference likely comes from the power switching circuitry, which works at a fairly high frequency usually. The strength of interference is probably correlated to how much power the XBox is using (if you start playing a game, it should become even worse).

    Motors also generate some EMI, but at lower frequencies.

    Unfortunately electromagnetic interference is one of those things that everyone (well every electrical engineer) knows the theories about, but actually solving EMI problems is usually just trying a bunch of different things... even in actual product design (products need to meet EMI standards to receive regulatory approval).
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    (Original post by ihavemooedtoday)
    Does any other appliance show interference (being interfered) other than the TV?
    Like speakers? I'm only getting problems with the TV.

    What kind of TV is it?
    A Samsung T24C300: http://www.currys.co.uk/gbuk/tv-dvd-...61474-pdt.html

    Channel-dependence could be because some channels are weaker than others (so the tuner works at higher gain, also amplifying the noise). Deterioration over time suggests hardware failing in the TV.
    It's getting worse. As well as BBC being affected it's now also affecting Five, and rather than the odd spurt every few minutes, it can get as bad as full on losing signal. It happens for a few seconds.
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    Unfortunately that sounds like your TV is dying . I would get it fixed if it's still under warranty. Unless you have a lot of electrical knowledge and equipment there's not much you can do yourself (besides the basic kicking it on the sides, etc).
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    (Original post by ihavemooedtoday)
    Unfortunately that sounds like your TV is dying . I would get it fixed if it's still under warranty. Unless you have a lot of electrical knowledge and equipment there's not much you can do yourself (besides the basic kicking it on the sides, etc).
    Blimey, I only bought it 6 months ago.
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    (Original post by Neverdie)
    Blimey, I only bought it 6 months ago.
    Are you able to use a different cable from the wall to the TV? It (more likely than your TV dying) could just be a dying cable. The interference could simply be coincidental to the use of other devices.
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    (Original post by mikeyd85)
    Are you able to use a different cable from the wall to the TV? It (more likely than your TV dying) could just be a dying cable. The interference could simply be coincidental to the use of other devices.
    What kind of other cable?

    The interference isn't coincidental, on the occasions mentioned they happened exactly as the appliances (next door's lawnmower, the blender, the Xbox) started.

    Edit: Got no interference during the first World Cup match. In the Brazil one I got two spurts of moderate interference (not tiny, not enough that it lost signal). I switched to my old TV at half time and got no intereference. Does seem to be my TV.
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    It's possible that the aerial is broken, but I think the TV is more likely. If the aerial is cheap, though, it may worth trying another one?

    If another TV works with the same aerial, it's most definitely the TV.
 
 
 
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