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pixelation/picture breakup on LG smart TV


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Old 02-05-2013, 08:31
garfie
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I have an LG smart TV, last week I started to get pixilation/breakup on the HD channels. Yesterday this started on the main channels too. BBC iplayer works fine though. I thought it was aerial problem but the other TV in the house f is fine. I've tried another TV in the same aerial socket which works fine
I'd be grateful for any ideas/help please...
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Old 02-05-2013, 10:33
chrisjr
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It could still be an aerial problem, or more specifically a signal issue. Unless the second TV you have tried is identical to the "problem" one you can't really draw any firm conclusions from the test you did. If the signal is a bit marginal then it is quite possible for two different TVs to react differently.

For example if the signal is on the low side then a more sensitive tuner stage may be better able to cope with this than one that is a bit more "deaf". So the more sensitive device may handle the low signal without breaking up to the same degree as the other. Equally if the signal is too strong it could overload a sensitive tuner stage earlier than a less sensitive one. This can give rise to similar breakup as too little signal.

If your LG is anything like mine it should have a display of signal strength for each mux. If so have a look at that and see which end of the scale it's at. If down around 30% then you could have too little signal. If banging hard against 100% then it could be too much. Either of which could affect the LG more than the other TV you tried.

And have you tried the LG on another aerial point? Just to show whether it is a general issue with it or a particular aerial feed.

If the signal is OK, ie somewhere between 40 and 90% then it could be some other cause. Such as interference getting into the aerial feed or via the mains.

I have seen posts here on DS about HDMI cables getting tangled up with the aerial lead and causing interference. If either or both leads are poorly screened that could be a possibility. Not experienced it myself though. But easy to check simply by separating the aerial cable out from all the other cables round the back of the telly and keeping it as physically separate as possible from the others.

There is a possibility the break up is due to mains glitches. If you can spot a pattern in the picture break up, eg it occurs when some electrical switch operates (light, central heating thermostat etc) then that might point to a cause.

Switches can deteriorate with use and cause sparking as the contacts open and close which generates interference that could affect the TV. My favourite was an old Goodmans box my mum had that muted the audio briefly every time the fridge door was opened or closed and the light in the fridge switched on and off! Her current telly doesn't suffer this problem (same fridge). Which just shows that different devices can have different sensitivities to interference via the mains.
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Old 02-05-2013, 14:00
Max Skylon
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'If your LG is anything like mine it should have a display of signal strength for each mux'.

Hi Chrisjr,

What are 'mux'......................thanks
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Old 02-05-2013, 14:16
chrisjr
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'If your LG is anything like mine it should have a display of signal strength for each mux'.

Hi Chrisjr,

What are 'mux'......................thanks
Mux is an abbreviation for multiplex. The method by which several separate TV channel data streams are combined into a single stream for broadcast.

The receiver (TV, set top box PVR or whaever) then de-multiplexes this stream to recreate the individual TV channel stream that you want to watch or record.
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Old 02-05-2013, 19:58
Max Skylon
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Thanks
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