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melvink
Beginner
316 Views
Message 1 of 15

Picture breakup

Since the Freeview retune on 27th March I have been experiencing intermittent blank screen and pixcelation on Freeview channels received through my Youview box. The problem occurs approximately every 10 minutes, persists for 2 seconds and then the picture quality is absolutely fine. The signal strength and quality as reported by the box are both 99%. The problem is only manifest on signals received through the box as the picture onthe TV which uses the same aerial does not seem to exhibit the problem. Any help would be appreciated.

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14 REPLIES 14
Distinguished Sage
Distinguished Sage
311 Views
Message 2 of 15

Re: Picture breakup

Welcome to this user forum. @melvink 

See http://bt.custhelp.com/app/answers/detail/a_id/49692/~/bad-quality-or-missing-freeview-channels-on-b...

Changes in transmitter power levels could be resulting in signal overload, so it may be worth dropping the signal level slightly, using an attenuator.

Similar thread https://community.bt.com/t5/YouView-from-BT/Missing-HD-Channels-on-Youview-Box/m-p/1937748#M50889

 

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melvink
Beginner
287 Views
Message 3 of 15

Re: Picture breakup

Thanks for the suggestion Keith - I will try an attenuate.

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Distinguished Sage
Distinguished Sage
284 Views
Message 4 of 15

Re: Picture breakup


@melvink wrote:

Thanks for the suggestion Keith - I will try an attenuate.


Its always worth a try, it sometimes helps, espacially if it one mux which is causing an overload.

You can get a fixed value one, or a variable one like this.

variable_attenuator.jpg

If you search sites like Amazon, for LOOPS Aerial Coaxial Cable Variable Attenuator,  or Philex Variable TV Signal Attenuator

The other possibility is 4G interference. See https://at800.tv/guide/4g-filters-guide/

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melvink
Beginner
237 Views
Message 5 of 15

Re: Picture breakup

I have tried an attenuater and unfortunately it has not made any difference. 

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Distinguished Sage
Distinguished Sage
234 Views
Message 6 of 15

Re: Picture breakup


@melvink wrote:

I have tried an attenuater and unfortunately it has not made any difference. 


The other possibility is 4G interference. See https://at800.tv/guide/4g-filters-guide/

Or you could have a faulty box.

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Mark_D
Aspiring Contributor
175 Views
Message 7 of 15

Re: Picture breakup

I have *exactly* the same issue. Since 27th March Freeview HD channels break up every 10 mins for 1-2 seconds. The signal strength/quality meters go to zero for a moment, then everything OK for the next 10 mins.

This does not happen on SD channels, only Freeivew HD. All subscription channels are fine.

BT replaced the STB and the new box (manufactured several years apart) displays the same fault.

Freeview sent out an aerial engineer who has signed off on the aerial, cabling and signal quality (100%). He has fitted a 3db attenuator and 4g filter. Made no difference. I can time the issue with my watch - it's almost exactly every 10 mins. 

There are no splitters or boosters, the aerial cable goes from the aerial into the BT STB then out and to the TV. The Samsung TV does not have any problems using the same signal.

All this since the re-tune on 27th March. Will be interesting to see what the BT TV engineer says tomorrow. My hunch is that it's a software glitch in the YouView box somewhere (given the predictability and repetitiveness of the fault), but who knows!

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Mark_D
Aspiring Contributor
172 Views
Message 8 of 15

Re: Picture breakup

I meant to add, it’s 10 mins from the point you start watching the channel, so every time you change channel you reset the timer.

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melvink
Beginner
161 Views
Message 9 of 15

Re: Picture breakup

Thanks so much for your post. I was beginning to despair and will wait eagerly to hear what your BT engineer has to say.

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Mark_D
Aspiring Contributor
149 Views
Message 10 of 15

Re: Picture breakup

Out of interest and to determine if there’s any geographical link, whereabouts are you roughly? I’m In Weymouth on the South Coast. 

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