Hi.

I'm guessing someone here might have some ideas on how to go about this.

My TV does not seem to be able to split the Y and C signals from the
composite input pin on the SCART connector. I get a black&white picture.
However, my VCR does output a proper, colour picture to the set. I'm
guessing that the VCR outputs RGB signals, and the TV is using those.

So, I've been wondering about the feasibility of making a converter from
composite video to RGB. I have not found such a circuit online, but I have
found an IC that should be perfect - the MC44011. The problem, of course,
is that it's been discontinued for a long time and I haven't found a
supplier with a stock willing to sell me only 2-3 of them. I'd like it if
someone could either help me get in touch with a supplier that can do
this, or point me to other ICs that would be suitable. Being controllable
from a micro is a big plus, as well as minimal external component count.

Thanks,
David

--
Graham.



%Profound_observation%
"dsg" wrote in message
news
Hi.

I'm guessing someone here might have some ideas on how to go about this.

My TV does not seem to be able to split the Y and C signals from the
composite input pin on the SCART connector. I get a black&white picture.
However, my VCR does output a proper, colour picture to the set. I'm
guessing that the VCR outputs RGB signals, and the TV is using those.

So, I've been wondering about the feasibility of making a converter from
composite video to RGB. I have not found such a circuit online, but I have
found an IC that should be perfect - the MC44011. The problem, of course,
is that it's been discontinued for a long time and I haven't found a
supplier with a stock willing to sell me only 2-3 of them. I'd like it if
someone could either help me get in touch with a supplier that can do
this, or point me to other ICs that would be suitable. Being controllable
from a micro is a big plus, as well as minimal external component count.

Thanks,
David



Some PVR's output RGB, but I know of no consumer VCR that does

I would rather concentrate on why your TV is not displaying composite PAL
video in colour (I assume it's PAL 'cos you know how to spell 'colour')

What model of TV is it? Some TV's can be switched in the menu, or by a
hardware switch on the back, to accept S-Video signals to the SCART.

In this configuration Luminance is expected on pin 20 and chrominance on 15

As pin 20 is normally the composite input you can see why the picture would
be monochrome.


Graham.

%Profound_observation%

Hi...

My TV does not seem to be able to split the Y and C signals from the
composite input pin on the SCART connector. I get a black&white picture.

What is the signal source that comes out in B&W?

However, my VCR does output a proper, colour picture to the set. I'm
guessing that the VCR outputs RGB signals, and the TV is using those.

Are you also using the SCART input at this point?

IMHO if it's a DVD player giving you black and white, I'd be 99% sure it's
outputting the wrong standard eg NTSC, PAL-60 or whatever, and your set is
expecting something different (eg PAL-50).

Go thru the device setup menus and change the output type to match the TV.

Craig

On Thu, 28 Oct 2004 03:12:12 +0000, Craig Hart wrote:





Hi...

What is the signal source that comes out in B&W?

I've tried a DVD player, and the TV-out function of my computer's graphics
card (though I don't really trust that).



Are you also using the SCART input at this point?


Yes, the SCART connector is the only input aside from the ant input.

IMHO if it's a DVD player giving you black and white, I'd be 99% sure
it's outputting the wrong standard eg NTSC, PAL-60 or whatever, and your
set is expecting something different (eg PAL-50).


It's possible the devices are putting out NTSC or PAL-60... but would
that really result in a black and white image? I'll connect the player up
again later today, see if I can find some configuration for this.

Go thru the device setup menus and change the output type to match the
TV.

Craig

Thanks for the help, I'll post again with results.

On Wed, 27 Oct 2004 21:43:35 +0100, Graham wrote:




--
Graham.



%Profound_observation%
"dsg" wrote in message
news

Some PVR's output RGB, but I know of no consumer VCR that does

I would rather concentrate on why your TV is not displaying composite PAL
video in colour (I assume it's PAL 'cos you know how to spell 'colour')

What model of TV is it? Some TV's can be switched in the menu, or by a
hardware switch on the back, to accept S-Video signals to the SCART.

In this configuration Luminance is expected on pin 20 and chrominance on 15

As pin 20 is normally the composite input you can see why the picture would
be monochrome.


Graham.

%Profound_observation%


Hi,

Thanks for the suggestions. The set is indeed PAL. The problem is, it's
some rebranded no-name set (says "mark" on the front, on the back there is
a model number: "TBT2002 TXT", which google doesn't find anything for).
I'm also quite sure I've seen the same set under a different brand name, I
just don't remember where.

The TV doesn't really have a config menu, and I couldn't find any switches
on the back.

Thanks,
David

Kibo informs me that dsg stated that:

Hi.

I'm guessing someone here might have some ideas on how to go about this.

My TV does not seem to be able to split the Y and C signals from the
composite input pin on the SCART connector. I get a black&white picture.
However, my VCR does output a proper, colour picture to the set. I'm
guessing that the VCR outputs RGB signals, and the TV is using those.

I'm sure that there are VCRs that output RGB, but I've never seen one. I
think it's a lot more likely that your SCART cable is faulty, or
something is set to NTSC instead of PAL, or vice versa.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

Kibo informs me that "Craig Hart" stated that:

IMHO if it's a DVD player giving you black and white, I'd be 99% sure it's
outputting the wrong standard eg NTSC, PAL-60 or whatever, and your set is
expecting something different (eg PAL-50).

Yes, so would I. Another possibilty is that the SCART cable is broken or
not seated correctly, & the TV isn't getting all the colour data.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

Well, it appears that the VCR is actually just outputting a composite
signal. The problem (at least with the TV-output from the computer) was
that it was only outputting an S-Video signal. With the DVD player, I
assume it must be as others here have suggested, that it was outputting
NTSC.

Anyway, I guess I'll have to work out how to convert S-Video to composite.
I found a simple schematic online (just connect a 470pF capacitor between
Y and C, and tap the composite signal out of the Y pin). This doesn't seem
to work for me, as I just get a black screen with some scrolling
distortion. Has this worked for someone else here?

Thanks,
David

Kibo informs me that dsg stated that:

Well, it appears that the VCR is actually just outputting a composite
signal. The problem (at least with the TV-output from the computer) was
that it was only outputting an S-Video signal. With the DVD player, I
assume it must be as others here have suggested, that it was outputting
NTSC.

If your video card is a Matrox, they have a standard cable with both
S-Video & composite outputs on separate connectors. If you hunt through
the support section on their website, they also have the wiring diagram
for it so you can make your own.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------