Author Topic: Video failure  (Read 7169 times)

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Offline landex

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Video failure
« on: 21:50, 18 April 14 »
'Hi to all,

Iam new here. Ibought a cpc464 and it seems that the screen every 2, 3 sec shacks with the scart cable. And if  I put  a Video adapter it doesnt shakes anymore but of course the colors are B/W.
Anyone knows  why?
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Offline TFM

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Re: Video failure
« Reply #1 on: 21:53, 18 April 14 »
Hi and welcome here. Did you try another monitor?
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Offline landex

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Re: Video failure
« Reply #2 on: 22:00, 18 April 14 »
i dont have a monitor,  only TV ;(
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Offline landex

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Re: Video failure
« Reply #3 on: 00:36, 19 April 14 »
I think i found the problem: My LCD TV its too modern. Can it be?
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Offline Bryce

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Re: Video failure
« Reply #4 on: 02:02, 19 April 14 »
Hi and welcome,
         unfortunately your TV isn't able to lock on to the exact sync frequency the CPC is producing. Video adapter is a very broad term, which type do you mean? If your TV has S-Video, it might be worth trying to connect via that?

Bryce.
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Offline landex

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Re: Video failure
« Reply #5 on: 16:00, 19 April 14 »
On S-Video works, but only B/W.
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Offline Bryce

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Re: Video failure
« Reply #6 on: 16:03, 19 April 14 »
If it's B&W then it's not S-Video, your TV is only detecting or displaying the Composite part of the signal. Without hardware like this: Limited batch of new S-Video Adapters. you can't get an S-Video signal from a CPC.

Bryce.
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Offline landex

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Re: Video failure
« Reply #7 on: 17:21, 19 April 14 »
If it's B&W then it's not S-Video, your TV is only detecting or displaying the Composite part of the signal. Without hardware like this: Limited batch of new S-Video Adapters. you can't get an S-Video signal from a CPC.

Bryce.

Sorry Bryce, you right: it is not S-Vide, its composite.

Now I try , connect the scart on my  VCR input, ad it stil B/W. Only if I connect the scart directly to the TV i get color, but it shakes.

I have a E-motion plasma TV.
 
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Offline TotO

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Re: Video failure
« Reply #8 on: 17:30, 19 April 14 »
Probably your VCR need to set the input signal type from the scart cable.

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Offline landex

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Re: Video failure
« Reply #9 on: 19:20, 19 April 14 »
What if i buy a Scart -> Vga cable to connect the 464 to VGA input of my TV or  Monitor?

Has anyone try it?
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Offline TFM

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Re: Video failure
« Reply #10 on: 20:17, 19 April 14 »
I think i found the problem: My LCD TV its too modern. Can it be?


Absolutely, that can happen. Maybe you can check with a monitor or tv at a friends place, then you know that CPC and cable are ok.




I have a E-motion plasma TV.


Yep, all this emotions can shake a pic quite well! :)
« Last Edit: 20:19, 19 April 14 by TFM »
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Offline landex

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Re: Video failure
« Reply #11 on: 20:29, 19 April 14 »



Yep, all this emotions can shake a pic quite well!
:)

I see it must be the  bloody TV

Thanks a lot to all
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Offline TFM

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Re: Video failure
« Reply #12 on: 21:42, 19 April 14 »
Try to get an old Sony Trinitron. Reliable and superb picture.
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Offline Bryce

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Re: Video failure
« Reply #13 on: 22:12, 19 April 14 »
Does the TV have a seperate S-Video input (4 pin round connector) ?

Bryce.
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Offline landex

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Re: Video failure
« Reply #14 on: 15:09, 20 April 14 »
Does the TV have a seperate S-Video input (4 pin round connector) ?

Bryce.

No, it has not S-Video input.
But is has Component Video, 3 inputs: Y, Pb, Pr
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Offline Bryce

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Re: Video failure
« Reply #15 on: 15:29, 20 April 14 »
Then there's a good chance that the S-Video pins in the SCART socket aren't connected. The TV definitely isn't suited for retro use.

Bryce.
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Offline landex

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Re: Video failure
« Reply #16 on: 15:55, 20 April 14 »
Then there's a good chance that the S-Video pins in the SCART socket aren't connected. The TV definitely isn't suited for retro use.

Bryce.
Which S-Video pins in the Scart should be connected?
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Offline landex

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Re: Video failure
« Reply #17 on: 16:02, 20 April 14 »
I read that some scarts needs a 1,5V battery in the 16pin of the scart
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Offline TFM

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Re: Video failure
« Reply #18 on: 04:25, 22 April 14 »
... 3 inputs: Y, Pb, Pr


Y = Yttrium
Pb = Lead (Plumbum)
Pr = Praseodynium


... nice mix of elements  :)
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Offline TotO

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Re: Video failure
« Reply #19 on: 15:11, 24 April 14 »
Here, how the MP2 look to handle the signal from the CPC to the Scart out.
My friend iXien let me see inside, because it allow to get a sync picture on his LCD screen. (not the schematic usually found on internet)


 [ Invalid Attachment ]

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Offline Bryce

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Re: Video failure
« Reply #20 on: 15:28, 24 April 14 »
That's just adding a voltage to pins 16 (RGB select) to keep the TV in RGB mode and pin 8 (Aspect ratio) to force the TV to 4:3 format. are you sure about the value of R23? I would have thought it would need to be a bit larger.

Bryce.
« Last Edit: 15:31, 24 April 14 by Bryce »
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Offline TotO

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Re: Video failure
« Reply #21 on: 15:32, 24 April 14 »
Sure, but not only.
Some schematic on Internet said to use the luminance signal too. Look to be wrong.

I understand, but yes... Both are orange, orange, brown, gold resistors.
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Offline Bryce

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Re: Video failure
« Reply #22 on: 15:43, 24 April 14 »
I don't think I've ever seen an official schematic for the French MP-2.

Bryce.
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Re: Video failure
« Reply #23 on: 18:16, 24 April 14 »
I was surprised to see so few things inside.
There are the PSU part close to the PCB with this dirty hack (many straps) instead of the expected parts drawn on it.
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Offline landex

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Re: Video failure
« Reply #24 on: 03:33, 27 April 14 »
i try my cpc with a CRT TV and it  works fine ;D
Bloody Plasmas!

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