bt vision in black and white,

woody6032 · 28-05-2010, 07:27

hello all, turned my box on last night after being on standby and it in black and white. normal tv is ok, the box was making a strange clicking sound last week then it stopped and no this has happened, any ideas? cheers woody.

intercept · 28-05-2010, 11:15

Not sure about the clicking noise, but if the scart connector partially disconnects its possible to lose colour. This can happen if the box is pushed backwards against a wall/cabinet etc.

chrisjr · 28-05-2010, 12:56

Another possible explanation is a mismatch in video modes between box and TV. Most commonly with black & white pictures is one end set to Composite and the other set to S-Video.

SCART was never designed to carry S-Video so it was bodged on top of the existing spec. S-Video has two components, colour and black & white. The colour part is fed up one of the RGB video leads and the black & white part up the Composite video lead.

So if the box sends S-Video and the TV is set to Composite the TV only sees the black & white part. If the box sends composite and the TV is expecting S-Video it displays the signal on the composite lead as black & white (which is what is expecting) even though the box is sending a full colour picture.

If the box has done a reset as a result of some other problem then it may well have reverted to Composite from S-Video previously. So worth checking both box and telly are talking the same language

stuntmaster · 28-05-2010, 14:10

Quote:

Originally Posted by chrisjr

Another possible explanation is a mismatch in video modes between box and TV. Most commonly with black & white pictures is one end set to Composite and the other set to S-Video.

SCART was never designed to carry S-Video so it was bodged on top of the existing spec. S-Video has two components, colour and black & white. The colour part is fed up one of the RGB video leads and the black & white part up the Composite video lead.

So if the box sends S-Video and the TV is set to Composite the TV only sees the black & white part. If the box sends composite and the TV is expecting S-Video it displays the signal on the composite lead as black & white (which is what is expecting) even though the box is sending a full colour picture.

If the box has done a reset as a result of some other problem then it may well have reverted to Composite from S-Video previously. So worth checking both box and telly are talking the same language

your theory is quite possibly it chris. however
you can't set S-Video on BT vision. It is done automatically. but only 2 modes available. (I do wish there were manual settings though)

when the box boots up, either from fresh or standby the scart plug sends a signal (I forgot the pin) to the TV. if its grounds high then the box outputs in RGB. if it doesn't ground then it's composite.

the only setting you get is aspect ratio.

4:3 - Scart
16:9 - Scart
720p - Triggers off HDMI port
1080i - Also triggers off HDMI port.

I reckon if woody turns box off then disconnects scart cable from the TV, and then leaves it on another source but scart.

then plug scart back in and fire up the box. it should ground pin 8 and flip[ to scart then ground the other pin and set it to RGB/or not ground and set it to composite.

However if you are HDMI then switch both TV and box off. then turn tv on then BT vision and it should re-handshake.

Hope this helps.

chrisjr · 28-05-2010, 14:45

Quote:

Originally Posted by stuntmaster

your theory is quite possibly it chris. however
you can't set S-Video on BT vision. It is done automatically. but only 2 modes available. (I do wish there were manual settings though)

when the box boots up, either from fresh or standby the scart plug sends a signal (I forgot the pin) to the TV. if its grounds high then the box outputs in RGB. if it doesn't ground then it's composite.

the only setting you get is aspect ratio.

4:3 - Scart
16:9 - Scart
720p - Triggers off HDMI port
1080i - Also triggers off HDMI port.

I reckon if woody turns box off then disconnects scart cable from the TV, and then leaves it on another source but scart.

then plug scart back in and fire up the box. it should ground pin 8 and flip[ to scart then ground the other pin and set it to RGB/or not ground and set it to composite.

However if you are HDMI then switch both TV and box off. then turn tv on then BT vision and it should re-handshake.

Hope this helps.

Pin 8 on a SCART is the "hello I'm here" flag. plus 16:9/4:3 switching. Pin 16 is used to do RGB/Composite.

http://en.wikipedia.org/wiki/SCART

If the Vision box can't do S-Video then maybe someone has been playing with the TV and set that instead. Can't rule out the dodgy SCART option, lets face it most SCART plugs fall out at the slightest excuse

But in my experience a loose SCART set to RGB tends to produce an oddly coloured image not black and white. Whereas I have seen black and white when Composite and S-Video get mixed up.

speckledhen · 29-05-2010, 08:32

Last time my tv received black and white picture I found that the scart lead was not fully in on the back of the TV, pushed it firmly home and hey presto normal colour picture

TraceT · 29-05-2010, 14:08

Quote:

Originally Posted by speckledhen

Last time my tv received black and white picture I found that the scart lead was not fully in on the back of the TV, pushed it firmly home and hey presto normal colour picture

I too often used to find that to be the case after household cleaning/dusting etc, and amongst family members equipment also. They do become dislodged very easily.

stuntmaster · 29-05-2010, 17:07

Quote:

Originally Posted by chrisjr

Pin 8 on a SCART is the "hello I'm here" flag. plus 16:9/4:3 switching. Pin 16 is used to do RGB/Composite.

http://en.wikipedia.org/wiki/SCART

If the Vision box can't do S-Video then maybe someone has been playing with the TV and set that instead. Can't rule out the dodgy SCART option, lets face it most SCART plugs fall out at the slightest excuse

But in my experience a loose SCART set to RGB tends to produce an oddly coloured image not black and white. Whereas I have seen black and white when Composite and S-Video get mixed up.

Ahh cheers, I thought there was a pin for RGB.

of course im not ruling out a dodgy connection. It could well be that. and/or the TV could be set to scart YC (mine has such option to force the scart in S-Video mode)

in that case if anyone wants BT vision in composite ad not RGB. simply remove pin 16. (useful if one of those cheapo scart switchers don't do RGB properly (appears dark or not visible at all))

is there a device you can plug inline to easily disable pin8 or pin16?

28-05-2010, 07:27	#1
woody6032 Forum Member Join Date: Nov 2009 Posts: 4	bt vision in black and white, hello all, turned my box on last night after being on standby and it in black and white. normal tv is ok, the box was making a strange clicking sound last week then it stopped and no this has happened, any ideas? cheers woody.

28-05-2010, 11:15	#2
intercept Forum Member Join Date: Mar 2006 Posts: 311	Not sure about the clicking noise, but if the scart connector partially disconnects its possible to lose colour. This can happen if the box is pushed backwards against a wall/cabinet etc.

28-05-2010, 12:56	#3
chrisjr Forum Member Join Date: May 2004 Location: Reading Posts: 27,916	Another possible explanation is a mismatch in video modes between box and TV. Most commonly with black & white pictures is one end set to Composite and the other set to S-Video. SCART was never designed to carry S-Video so it was bodged on top of the existing spec. S-Video has two components, colour and black & white. The colour part is fed up one of the RGB video leads and the black & white part up the Composite video lead. So if the box sends S-Video and the TV is set to Composite the TV only sees the black & white part. If the box sends composite and the TV is expecting S-Video it displays the signal on the composite lead as black & white (which is what is expecting) even though the box is sending a full colour picture. If the box has done a reset as a result of some other problem then it may well have reverted to Composite from S-Video previously. So worth checking both box and telly are talking the same language

28-05-2010, 14:10	#4
stuntmaster Forum Member Join Date: May 2005 Location: Southampton - Hannington - TX Posts: 4,878	Quote: Originally Posted by chrisjr Another possible explanation is a mismatch in video modes between box and TV. Most commonly with black & white pictures is one end set to Composite and the other set to S-Video. SCART was never designed to carry S-Video so it was bodged on top of the existing spec. S-Video has two components, colour and black & white. The colour part is fed up one of the RGB video leads and the black & white part up the Composite video lead. So if the box sends S-Video and the TV is set to Composite the TV only sees the black & white part. If the box sends composite and the TV is expecting S-Video it displays the signal on the composite lead as black & white (which is what is expecting) even though the box is sending a full colour picture. If the box has done a reset as a result of some other problem then it may well have reverted to Composite from S-Video previously. So worth checking both box and telly are talking the same language your theory is quite possibly it chris. however you can't set S-Video on BT vision. It is done automatically. but only 2 modes available. (I do wish there were manual settings though) when the box boots up, either from fresh or standby the scart plug sends a signal (I forgot the pin) to the TV. if its grounds high then the box outputs in RGB. if it doesn't ground then it's composite. the only setting you get is aspect ratio. 4:3 - Scart 16:9 - Scart 720p - Triggers off HDMI port 1080i - Also triggers off HDMI port. I reckon if woody turns box off then disconnects scart cable from the TV, and then leaves it on another source but scart. then plug scart back in and fire up the box. it should ground pin 8 and flip[ to scart then ground the other pin and set it to RGB/or not ground and set it to composite. However if you are HDMI then switch both TV and box off. then turn tv on then BT vision and it should re-handshake. Hope this helps.

28-05-2010, 14:45	#5
chrisjr Forum Member Join Date: May 2004 Location: Reading Posts: 27,916	Quote: Originally Posted by stuntmaster your theory is quite possibly it chris. however you can't set S-Video on BT vision. It is done automatically. but only 2 modes available. (I do wish there were manual settings though) when the box boots up, either from fresh or standby the scart plug sends a signal (I forgot the pin) to the TV. if its grounds high then the box outputs in RGB. if it doesn't ground then it's composite. the only setting you get is aspect ratio. 4:3 - Scart 16:9 - Scart 720p - Triggers off HDMI port 1080i - Also triggers off HDMI port. I reckon if woody turns box off then disconnects scart cable from the TV, and then leaves it on another source but scart. then plug scart back in and fire up the box. it should ground pin 8 and flip[ to scart then ground the other pin and set it to RGB/or not ground and set it to composite. However if you are HDMI then switch both TV and box off. then turn tv on then BT vision and it should re-handshake. Hope this helps. Pin 8 on a SCART is the "hello I'm here" flag. plus 16:9/4:3 switching. Pin 16 is used to do RGB/Composite. http://en.wikipedia.org/wiki/SCART If the Vision box can't do S-Video then maybe someone has been playing with the TV and set that instead. Can't rule out the dodgy SCART option, lets face it most SCART plugs fall out at the slightest excuse But in my experience a loose SCART set to RGB tends to produce an oddly coloured image not black and white. Whereas I have seen black and white when Composite and S-Video get mixed up.

29-05-2010, 08:32	#6
speckledhen Forum Member Join Date: Mar 2007 Posts: 767	Last time my tv received black and white picture I found that the scart lead was not fully in on the back of the TV, pushed it firmly home and hey presto normal colour picture

29-05-2010, 14:08	#7
TraceT Forum Member Join Date: Nov 2006 Location: Rotherham, S.Yorks UK Posts: 201	Quote: Originally Posted by speckledhen Last time my tv received black and white picture I found that the scart lead was not fully in on the back of the TV, pushed it firmly home and hey presto normal colour picture I too often used to find that to be the case after household cleaning/dusting etc, and amongst family members equipment also. They do become dislodged very easily.

29-05-2010, 17:07	#8
stuntmaster Forum Member Join Date: May 2005 Location: Southampton - Hannington - TX Posts: 4,878	Quote: Originally Posted by chrisjr Pin 8 on a SCART is the "hello I'm here" flag. plus 16:9/4:3 switching. Pin 16 is used to do RGB/Composite. http://en.wikipedia.org/wiki/SCART If the Vision box can't do S-Video then maybe someone has been playing with the TV and set that instead. Can't rule out the dodgy SCART option, lets face it most SCART plugs fall out at the slightest excuse But in my experience a loose SCART set to RGB tends to produce an oddly coloured image not black and white. Whereas I have seen black and white when Composite and S-Video get mixed up. Ahh cheers, I thought there was a pin for RGB. of course im not ruling out a dodgy connection. It could well be that. and/or the TV could be set to scart YC (mine has such option to force the scart in S-Video mode) in that case if anyone wants BT vision in composite ad not RGB. simply remove pin 16. (useful if one of those cheapo scart switchers don't do RGB properly (appears dark or not visible at all)) is there a device you can plug inline to easily disable pin8 or pin16?

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