SCART RGB Lead problem

[Framiga]

OK

What I have here connected

http://wiki.classicamiga.com/Amiga_RGB_to_Scart_lead

Scart

5, 7, 9, 11, 13, 15, 17, 18 and 20. 17 and 18 are connected with jumpwire

So need to figure out 5, 9, 13 what those are for / where they go (ground signals???) and cut jumpwire form 17 to 18. Get 12v to pin 16

D-sub is has all needed wires exept 22

pins 5-9-13 SCART side are the RGB ground signals thats must go to

pins 16-17-18 Amiga RGB connector side (actually it would be better to have single shielded mini-coaxial cables for R-G-B and CSync)

Keep as reference (resistors apart which your telly doesn't need) Jan's page

http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_SCART/amiga_scart.html

[utri007]

No I'm confused... wich one is that I need? Those two are totally diffent and my current cable doesn't have needed wire to do later one.

Do I cut those ground wires or not?? "pins 5-9-13 SCART side are the RGB ground signals thats must go to pins 16-17-18 Amiga RGB connector side". And why my cable has jump wire from 17 to 18?? What I do with it?? It is composite video ground and logic ground???

With this one I just need to move one wire to different pin and do some wire cutting

http://wiki.classicamiga.com/Amiga_RGB_to_Scart_lead

[Framiga]

beeing all GND grounds (SCART 5-9-13 and AmigaRGB 16-17-18), yes keep it as they are.

[utri007]

Does anyone now how those vesalia's cabels are wired? Will they work with LCD tv??

I rather buy new cabel than risk anything trying to make my own.

[alexh]

AmigaKit's cables are most likely to work with LCDTV.

I think this thread was an example of a broken TV SCART socket design which had grounds incorrectly wired inside the TV. By leaving a few out it got rid of the problem.

[utri007]

OK I've made some reserch, my cable is othervice identical to this

http://wiki.classicamiga.com/Amiga_RGB_to_Scart_lead

*Except 12v from 22 to 16 my cable doesn't have that.
*I've quite many ground wires connected, 3 video ground to pins  5, 9 and 13
*17/18 composite video ground/logic ground are connected with jumpwire

So my questions are,

*If I modify one of the ground wires to 12v is it ok? From pins 22 to 16??
[edit] I'll remove audio wires and use one of them to get that 12v, so after that I still have 2 wires to use to another purpose. Here http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_SCART/amiga_scart.html pin 16 has said to be rgb mode and it is wired to 23 on d-sub connector??? SO will I connect pin 16 to 22 or 23? To pin 22 wire comes from d-sub 8 wich is a switch???

*The is also ground wire soldered to D-Sub connector's shield but no connection to Scart connector shield??? What I do with that? Should I join that wire to scart connector's shield?

I really would appreciate if you could help me with this.

My problem is excatly like this :

http://www.datacenta.it/Photo2.jpg

There is a picture but it is hardly visible.

[Stedy]

@Tribz

Your original problem was caused by an incorrect voltage on pin 16. The Video decoder IC within the TV was using the SCART blanking feature and alpha blending the RGB and composite (derived by the look of it) video signals. That is why you had a ghosted image, the composite video signal was 4-6us ahead of the RGB signal.

I wrote the SCART cable guide and drew the diagram shown in this thread.  The resistor from pin 10 of the Amiga (TTL CSYNC) is very important, without it you risk damaging your LCD TV. The Amiga CSYNC output is a HCMOS TTL signal with an Amplitude of >4.5V. The composite video input of the TV expects at most a 1V video signal. The devices typically operate of 3.3/1.8V supplies so the >4.5V signal from the Amiga is not good news.

The Amigakit SCART cables are wired to my diagram. Could you supply the model number of your TV please, would be interested to know why an LCD does not work, this cable has been widely tested.

[utri007]

@Tribz

Your original problem was caused by an incorrect voltage on pin 8. The Video decoder IC within the TV was using the SCART blanking feature and alpha blending the RGB and composite (derived by the look of it) video signals. That is why you had a ghosted image, the composite video signal was 4-6us ahead of the RGB signal.

I wrote the SCART cable guide and drew the diagram shown in this thread.  The resistor from pin 10 of the Amiga (TTL CSYNC) is very important, without it you risk damaging your LCD TV. The Amiga CSYNC output is a HCMOS TTL signal with an Amplitude of >4.5V. The composite video input of the TV expects at most a 1V video signal. The devices typically operate of 3.3/1.8V supplies so the >4.5V signal from the Amiga is not good news.

The Amigakit SCART cables are wired to my diagram. Could you supply the model number of your TV please, would be interested to know why an LCD does not work, this cable has been widely tested.

Stedy would you help me?

What should I do

*
Connect D-Sub 22 to SCART 16

OR

*
Connect D-Sub 22 to SCART 8 and D-Sub 23 to SCART 16

AND

What I do with that ground signal from D-Sub shield? Do I connect it to scar connector shield?

[Stedy]

@utri007

Follow my original cable diagram here:
http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_SCART/amiga_scart.html

So connect D-sub 22 to pin 8 via 1 1K current limiting resistor.
Connect D-sub 23 to pin 16 via a 75 ohm resistor. This should yield a voltage around 2.5V at the SCART socket, thus selecting RGB input. Looks like your TV has selected CVBS/Composite, hence the completely white screen.

Ian

[utri007]

I ordered scart cable from Amikit, picture quality is PERFECT even in hires modes, no flickerin/blur etc.

My last question is: It works only in SCART1, SCART2 doesn't give picture at all. SCART1 is RGB, but is it possible to make cable wich gives picture from SCART2???

I've 3 amigas, wich I wanto to connect to LCD TV

[Franko]

I ordered scart cable from Amikit, picture quality is PERFECT even in hires modes, no flickerin/blur etc.

My last question is: It works only in SCART1, SCART2 doesn't give picture at all. SCART1 is RGB, but is it possible to make cable wich gives picture from SCART2???

I've 3 amigas, wich I wanto to connect to LCD TV

Most TVs only have SCART1 RGB enabled and unfortunately on most TVs SCART2 usually is only hard wired for Composite and SVIDEO...

Sometimes on more expensive TV's there is a menu whereby you can switch SCART2 to RGB but this is quite rare and it's usually a case of SCART2 not being hard wired for RGB...

[AndyFC]

You could try a SCART switcher: http://www.argos.co.uk/webapp/wcs/stores/servlet/Search?storeId=10001&catalogId=1500002701&langId=-1&searchTerms=SCART+BLOCK