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RGB to SCART Display Problem

Hi

I have an amplifier with RGB and Sync Phono connectors and I am connecting this to a scart equipped TV. (Input from source DVD player goes to to the AVAMP and then routed to TV from the AMP). I am receiving an image on the TV when I select the scart to be in RGB mode but there are some flickering lines on the screen. This is not the whole image flickering (as happens if I disconnect the sync cable) it is multiple (single pixel) flickering lines going horizontally across the screen.

I have independently disconnected each RGB cable (obviously this changes the colour of the image) to see if it is either of these cables but the lines remain. If I disconnect the sync cable the image is completely unstable as would be expected and therefore I cannot tell if the lines remain.

If I connect SCART to SCART from DVD to TV in RGB mode then the image is fine.

If I connect SCART to S-video (DVD to AMP) and s-video to SCART (AMP to TV) image is fine.

If I connect SCART to S-video (DVD to AMP) and RGB+Sync (Phono) to Scart) (Amp to TV) - AMP does conversion from s-video to RGB - I get the flickering lines.

Does anybody have any idea what may be the cause of these flickering lines or at least how I might diagnose them. Could it be bad shielding on the cable, a missing pin connect, bad grounding?

Thanks in advance.

Reply to
jjc001
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Pin 16 (fast blanking) working correctly? No strange fluctuations on pin 8?

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 - René
Reply to
René

Usually the leads that have extra sync. connectors are for Plasma screens and projectors that supports component input.

I think you just need a standard SCART -> 3 RGB Phonos?

jjc001 Wrote:

--
M.Joshi
Reply to
M.Joshi

Hi Ren=E9 Thanks for the quick response. Initially I had pins 8 and 16 connected also (although I still had the flickering lines).

I tried disconnecting these pins (to see if these were causing the problem) as I can select RGB manually on the TV along with the screen format (16:9,4:3).

So yes flickering lines were present with/without pins 8,16 connected.

Are these pins mandatory for RGB + Sync?

I thought for RGB then pin 8 was was 16:9 4:3 select (I am doing this manually) and pin 16 is - I am doing this manually using the TV menu and pin 16 was RGB mode select again I am doing this manually via the TV.

Thanks again

John

Ren=E9 wrote:

Reply to
jjc001

See if this helps:-

SCART INPUT RGB

1 - Audio out R 2 - Audio in R 3 - Audio out L 4 - Audio Earth 5 - Blue Earth 6 - Audio in L 7 - Blue (0.7Vpp/75ohm) 8 - Comp. Status - in 0-2V : INT 4.5-7V : EXT 16:9 9.5-12V : EXT 4:3 9 - Green Earth 10 - NC 11 - Green (0.7Vpp/75ohm) 12 - Nc 13 - Red Earth 14 - RGB-5tatus 15 - Red (0.7Vpp/75ohm) 16 - RGB - Status (0-0.4V:INT 1-3V:EXT/75ohm) 17 - Comp Earth 18 - Comp Earth 19 - Sync/Comp In (1Vpp/75ohm) 20 - Comp Out (1Vpp/75ohm) 21 - Earth screen 
--
*24 hours in a day ... 24 beers in a case ... coincidence? *

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.
Reply to
Dave Plowman (News)

Hi

Thanks for the advice. I have now resolved the problem. It would seem that the amp had some settings that indicated it should look for the source of the signal from the input RGB + Sync feeds when in fact I wanted to use the up conversion facility of the amp so I input s-video and composite feeds and output the RGB + Sync to the SCART (ie there was no feed on the RGB + Sync inputs).

So even though I was getting a picture (with flickering lines) it would seem that the amp was trying to use the RGB inputs where nothing was connected.

Anyway once I changed the settings to indicate to the amp there was in fact no RGB input feeds (just s-video and composite) the flickering lines were gone. So I have renewed confidence in my soldering/cable making abilities!

Your input/advice was much appreciated, thanks for taking the time to help out.

John.

Dave Plowman (News) wrote:

Reply to
jjc001

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