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General Category => Technical support - Hardware related => Topic started by: Vapid on 22:46, 13 November 15

Title: 6128 Video issue
Post by: Vapid on 22:46, 13 November 15
I've just got a 6128, and I'm having some video issues, I have the RGB Scart/power adapters here. Amstrad CPC 6128 TV Connection Kit (http://coolnovelties.co.uk/coolnovelties/amstrad-power-cables/28-amstrad-cpc-6128-tv-connection-kit.html)


The picture show fine, but every now and then will have a weird flicker. here's a YouTube video of it, happens around 5 and 10 seconds in. CPC 6128 Video problem. - YouTube (https://www.youtube.com/watch?v=NHC7e3t9xOk)

Anybody have any experience here with this problem or have a solution on how to fix it, I would appreciate any help anybody can give me. Thanks.
Title: Re: 6128 Video issue
Post by: Bryce on 23:03, 13 November 15
There can be two causes for this. The first is that the SCART doesn't know for sure where the signal is coming from and flicks to Composite every so often. This can be cured by adding a battery or capacitor to properly set the RGB selector input. The second cause is that the processor in the TV is using a sample rate that isn't able to properly sync with the CPCs Sync signal. This isn't easily solvable unfortunately. Converting the signal to S-Video via an AD724 can solve it, as the AD724 is more "forgiving" and has a perfectly clocked PAL sync output. This is what my S-Video adapter does.

Bryce.
Title: Re: 6128 Video issue
Post by: Vapid on 23:31, 13 November 15

Adding a capacitor sounds like the easiest option, even if my soldering skills are terrible!
Is there any guides about, on which capacitor is needed/where to solder it?
I tried also running the RGB cable through my "SLG in a box" connecting to the same TV via VGA and also my pc monitor, which instead of the odd flickering every now and then, made it screen constantly "shake" instead, at least that's the best way I can describe it.
Title: Re: 6128 Video issue
Post by: Bryce on 23:46, 13 November 15
Try wiring the cable like this: TV SCART cable - CPCWiki (http://www.cpcwiki.eu/index.php/TV_SCART_cable#Alternative_RGB_Wiring)

Bryce.
Title: Re: 6128 Video issue
Post by: Vapid on 02:02, 14 November 15
Well i had a try at rewiring the cable and it didn't got to great, prob due to my lack of soldering skills/lack of expertise, ive got the cable back to how it originally was now atleast, may buy the parts try making one from scratch rather than changing the RGB one i already have.
Title: Re: 6128 Video issue
Post by: CraigsBar on 12:59, 14 November 15
I have a TV that exhibits that exact same problem. I just use a different telly.
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