Author Topic: Dark SCART output with vertical lines  (Read 1256 times)

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Offline Zoe Robinson

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Dark SCART output with vertical lines
« on: 16:57, 19 February 16 »
Hi everyone!


So I recently found my trusty old Elgato EyeTV Hybrid, which lets me input analog and digital signals to my iMac; including SCART & composite inputs. I've plugged all my old consoles into it and it works perfectly. Today I picked up a connector that will finally allow me to plug the SCART output from the CPC SCART kit I have to the composite-in block for the EyeTV.


I was just settling down to play some fun, old games when, to my immense disappointment, I found this is the best quality output I'm getting from the CPC.





Any ideas what could be wrong, guys? I haven't a clue. The CPC was cleaned inside only a few months ago, to stop another video problem I had at the time (the monitor was flickering, rolling and mostly displaying all black until I cleaned the dust out of the CPC - since then it's worked perfectly).


The CPC outputs properly when connected to a TV using the SCART cable and the other parts of this connection all work when tested individually. The problem only occurs when I plug it all together.


Any ideas, guys?

Offline 1024MAK

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Re: Dark SCART output with vertical lines
« Reply #1 on: 19:59, 19 February 16 »
SCART can carry RGB video, composite video or S-Video.
The SCART leads for use with the CPC (well, the two that I have) only carry the RGB signals due to the CPC machines only producing RGB signals and a monochrome composite video output on their video output sockets.

If your Elgato EyeTV Hybrid is looking for a colour composite TV signal, it's not going to find one. As on the common SCART leads the composite video pin carries composite sync. hence a black picture. If you do see anything as well as the black, that will be bits of the sync signals being misinterpreted.

The monochrome composite video output is on pin 6 of the DIN socket. See the pin out on the Wiki here.
This monochrome composite video needs to be wired to pin 20 of the SCART plug if you are happy with having a monochrome picture.

Mark
« Last Edit: 20:12, 19 February 16 by 1024MAK »
Looking forward to summer in Somerset :-)

Offline Zoe Robinson

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Re: Dark SCART output with vertical lines
« Reply #2 on: 20:12, 19 February 16 »
Thanks. I'll talk to the manufacturers and see if there's a way to get it to look for mono composite (I can't find one).

Offline 1024MAK

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Re: Dark SCART output with vertical lines
« Reply #3 on: 20:15, 19 February 16 »
Note that there are more than two ways to wire up a SCART plug to a CPC. See the entry in the Wiki here.

So a SCART lead from a different supplier may give you a monochrome picture.

Mark

PS, I have just edited my earlier post.
Looking forward to summer in Somerset :-)

Offline chinnyhill10

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Re: Dark SCART output with vertical lines
« Reply #4 on: 20:18, 19 February 16 »
I think we now have 3 current threads on SCART issues that all amount to the same thing. You need the correct voltage on the RGB select pin of the SCART. A capacitor or a 1.5v battery. The capture card is trying to display composite hence the dim black and white picture. A solid 1.5 across the pin solves it in 95% of cases.
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Offline Zoe Robinson

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Re: Dark SCART output with vertical lines
« Reply #5 on: 21:41, 05 March 16 »
I got it all working!

It appears to be a power problem - thanks for putting me on the right track, guys!

Running the RCA jacks straight into my EyeTV gives the black screen, above, but if I use my DVD Recorder as a pass-through, it boosts the signals and I get to see the CPC in all its glory. :)



Offline chinnyhill10

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Re: Dark SCART output with vertical lines
« Reply #6 on: 21:56, 05 March 16 »
That is not how a CPC should look. It's too dark and very very blurry.
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Offline Zoe Robinson

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Re: Dark SCART output with vertical lines
« Reply #7 on: 21:58, 05 March 16 »
Yes, it's not how a CPC should look. It is, however, better than black-on-black.


I'm not finished working on this thing just yet and once I get proper RGB output (the DVD Recorder I'm using as a pass-through is clearly downgrading the signal) then I'll post again but for now at least I can use my beloved CPC. :)

Offline VincentGR

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Re: Dark SCART output with vertical lines
« Reply #8 on: 22:06, 05 March 16 »
My solution with what tools I had available is to connect the scart on a vcr with two scart sockets.
Then I output the second scart to rca.

Offline Zoe Robinson

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Re: Dark SCART output with vertical lines
« Reply #9 on: 22:11, 05 March 16 »
That sounds something like what I was doing here.


The connections go: CPC SCART output -> DVD Recorder with SCART-to-RGB output cable -> EyeTV device -> iMac


It's not the best quality ever, but it's a good start.