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Dadof4
Aspiring Contributor
5,752 Views
Message 1 of 16

Dashed line or black “flicker” at top of screen on certain channels

Hi All, I have just upgraded to a new Sony tv/soundbar & uhd YV box and am frustrated with certain channels. Many of the “mainstream channels” – BBC, ITV seem to be OK in both normal and HD variants, as do the BT Sport channels in the main, but others have one of three issues – 1) Flickering at the top line of the screen, 2) White dashed lines permanently at the top of the screen, or 3) A black flashing bar across the top half of the top line of the screen.

The TV Signal & Quality setting on by default is: UHD, 50fps, 8bit. If I change this to 1080p the issue goes away, but it is fiddly (and should be unnecessary to need to do this).

I have just been through all the channels that are affected, but an example is any of the 3 Disney channels, which all suffer from a black/white dashed line at the top of the screen.

Any help would be appreciated as this is quite frustrating! Many thanks 🙂

TVPhoto6.jpg

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15 REPLIES 15
zulu17
Distinguished Guru
Distinguished Guru
5,745 Views
Message 2 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

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Steve_M
BT TV Expert
5,716 Views
Message 3 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Hi Dadof4,

 

Let me raised it internally and see if it's something we can change on our encoders. Won't be quick but I'll get back to you with an update.

 

Steve

Dadof4
Aspiring Contributor
5,703 Views
Message 4 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Hi Steve_M. Thanks for that. In case it is useful, I have been sad enough to work through all the channels on YouView and categorised them as follows:

 

Channels with flickering at the top line of the screen

17 – Really

20 – Drama

21 – 5USA

22 – Ideal World

23 – CreateCraft

39 – The Store (this one has what looks like a barcode across the top left hand line of the screen)

55 – 5+24

68 – TruTV

76 – Jewellery Maker

 

Channels with white lines/dashes at the top line of the screen (by far the most frustrating issue)

48 – Movies4men

81 – Talking Pictures

84 – Dave ja vu

331 – Sony Channel

412 – Eurosport 1 (435 the HD version seems OK)

480 – Disney Channel (these Disney channels are the ones my children want to watch all the time – typical!)

481 – Disney Junior

482 – Disney XD

 

Channels with a black flashing bar across the top half of the top line of the screen

317 – National Geographic (373 the HD version seems OK)

318 – NatGeoWild (374 the HD version seems OK)

327 – History

328 – Ci (380 the HD version seems OK)

330 – H2

485 – Nicktoons

 

As I mentioned in my original post the TV Signal & Quality setting on by default is (UHD, 50fps, 8bit). If I change this to 1080p the issue goes away, but it is fiddly (and should be unnecessary to need to do this). More photo's from different channel below for info.

 

TVPhoto8.jpgTVPhoto7.jpg

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Steve_M
BT TV Expert
5,699 Views
Message 5 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Awesome, thanks!

 

I've raised it with the team - they are saying it is Wide Screen Signalling – as per ETSI http://www.etsi.org/deliver/etsi_i_ets/300200_300299/300294/01_60/ets_300294e01p.pdf

 

They're looking into how we can move it out of frame whilst keeping the funtionality.

 

Steve

Dadof4
Aspiring Contributor
5,694 Views
Message 6 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Excellent. thank you Steve. That sounds encouraging. Do you know if there is any rough timeline on when a potential fix might be delivered for this?

 

If you need me to test any updates I'd be more than happy and my children would appreciate their Disney channel being "cleaned up" for sure!

 

Thanks again for all your help, it is much appreciated.

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Sport-Tower
Retired BT Expert
5,619 Views
Message 7 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Hi Dadof4, We can confirm the fix has been applied across all affected channels so you should no longer see the data line. Please advise if you experience any further issues and many thanks for highlighting! Kind Regards Russell
Dadof4
Aspiring Contributor
5,593 Views
Message 8 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Hi Russell,

 

Thank you for the update, I really appreciate your support. Things have moved slightly, but many channels are still the same. In summary, the 3 Disney channels (480, 481 & 482) now no longer have the white dashed line at the top row of the screen, but there is now a flickering in the first row on these channels. I have been through all the channels again and the results are as follows:

 

Channels with flickering at the top line of the screen

17

Really

Still flickering at top line of screen

20

Drama

Still flickering at top line of screen

21

5USA

Still flickering at top line of screen

39

The Store

“Barcode” still there across the top right hand line of the screen (was previously left) & flickering on top line of screen.

55

5+24

Still flickering at top line of screen

68

TruTV

Still flickering at top line of screen

76

Jewellery Maker

Not being broadcast currently, so couldn’t check J.

30

5 Star

Flickering at top line of screen

310

Gold

Flickering at top line of screen

324

ID

Flickering at top line of screen

412

Eurosport 1

Previous white dashes gone, now flickering at top line of screen. 435 the HD version seems OK.

413

Eurosport 2

Flickering at top line of screen

480

Disney Channel

Previous white dashes gone, now flickering at top line of screen.

481

Disney Junior

Previous white dashes gone, now flickering at top line of screen.

482

Disney XD

Previous white dashes gone, now flickering at top line of screen.

487

Boomerang

Flickering at top line of screen

488

Cartoonito

Flickering at top line of screen

The "flickering" is very noticable when changing from a "non-flickering channel" (like BBC One HD or a BT Sport channel for instance).

 

Channels with white lines/dashes at the top line of the screen (by far the most frustrating issue)

48

Movies4men

White dashes still there

81

Talking Pictures

White dashes still there

84

Dave ja vu

White dashes still there

331

Sony Channel

Seems OK 🙂

 

Channels with a black bar (flickering on some channels) across the top half of the top line of the screen

22

Ideal World

Black bar still across top half of top line of screen.

23

CreateCraft

Black bar still across top half of top line of screen.

38

Quest+1

Black bar across top half of top line of screen.

40

Rocks & Co

Black bar across top half of top line of screen.

43

Gems

Black bar across top half of top line of screen.

49

TJC

Black bar across top half of top line of screen.

87

Country

Black bar across top half of top line of screen.

130

BBC News

Black bar across top half of top line of screen.

135

RT

Black bar across top half of top line of screen.

313

Good Food

Black bar across top half of top line of screen.

317

National Geographic

Black bar still across top half of top line of screen. 373 the HD version seems OK

318

NatGeoWild

Black bar still across top half of top line of screen. 374 the HD version seems OK

327

History

Black bar still across top half of top line of screen.

328

Ci

Black bar still across top half of top line of screen. 380 the HD version seems OK

330

H2

Black bar still across top half of top line of screen.

485

Nicktoons

Being broadcast in widescreen currently, so couldn’t check.

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gomezz
Recognised Expert
5,586 Views
Message 9 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Did you try the other suggestion of turning overscanning off on your TV set?
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Dadof4
Aspiring Contributor
5,533 Views
Message 10 of 16

Re: Dashed line or black “flicker” at top of screen on certain channels

Hi gomezz

 

I just did a simple test on my Sony Bravia TV, which itself has a built-in YV tuner. I tried the first channel that gives me a flickering top line from the BT YV box which is the Really channel (channel 17). When I watch this using the TV's built-in tuner all is fine, howver when I switch inputs to HDMI1 (where by BT YV box connects) I get the probelm. If I then change settings in the BT YV box, so that it only outputs 1080p all is fine, however, given my TV is 4k, I want to keep the TV Signal & Quality setting on UHD, 50fps, 8bit by default. I looked all through the various Picture options on the TV itself and can't see anything that would let me control overscanning :(.

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