Amiga 1200 & RGB scart cable results in very dark picture

mrleeman · 17 July 2008, 12:29

Hello everyone,

I bought an RGB scart cable for my Amiga 1200, but I'm dissatisfied with the resulting picture on my television. Although the picture is very stable and clean - as you'd expect it from an RGB signal - it is very, very dark

. Any experience with this? Can I do anything about it?

Through composite the brightness and colours are perfect.

Thanks,

Liam

Zetr0 · 17 July 2008, 18:02

@mrleeman

hello there,

Welcome to EAB, theres plenty of re0licious mischief to get upto around here, so kick back and enjoy the honey coated retr0dom that this fair board provides

now, from the sounds of it, the RGB cable has an abnormally HIGH draw on the RGB lines, although this could be the monitor that its plugged into.

So to help, lets have a look at your scart lead/cable and take photos of the circuitry each end and we can then help to advise

Merlin · 17 July 2008, 20:50

I suspect there are resistors on the RGB lines, if they are 75 Ohms and your TV is expecting 47 Ohms or none at all, this might explain it as the signal will be low. As Zetty says, a picture will reveal all.

Anemos · 17 July 2008, 23:42

probably exist resistances in the R-G-B cables, remove them and you will have bright signal.

mrleeman · 18 July 2008, 07:05

Hey... thanks for the warm welcome! I do like it Retr0

. I used to have an A500 for many, many years, but then I sold it to buy my first PC - shame on me. Since I could never really get over it I finally decided that it was inevitable to get the real thing again after sticking with UAE for quite some time. So here I am now, proud owner of an as-new CD32 and a brand-new A1200 - and lovin' it

Alright, tried my best to take the photos. Let me know if you need more

Thanks!

Merlin · 18 July 2008, 09:07

Yup, there are resistors on the RGB lines, they have been covered in heat shrink. I suggest you cut the heat shrink off the RGB signal lines and note the value of the resistors just in case (they are usually 47 or 75 Ohms, I've not come across any others being used).

Remove the resistors, reconnect the wires and all should be ticketty-boo.

Merlin

mrleeman · 18 July 2008, 12:11

Okay, great. I'll try that and report back.

Thanks a bunch!

Zetr0 · 18 July 2008, 14:20

@mrleeman

I best advise you to ONLY Remove resistors from

#pins #desc
07 blue
11 green
15 red

Leave other resistors in place

Merlin · 18 July 2008, 14:55

@ Zetr0,

Yeah, the red, blue and green wires.......

For those retro fans reading this thread in black and white, these are next to the yellow wire.....

LOL

TheCorfiot · 18 July 2008, 15:03

@Merlin

Do you mind I'm colour Blind!!!!!

TC

mrleeman · 18 July 2008, 16:07

@Zetr0:

I read your post in time

Had to get me a new soldering iron since my old one seems to be dead. The carnage is about to begin

@Merlin:

Thank you so much for offering your help in the WHDLoad thread. Unfortunately, I'm currently in Constance, Germany for my studies. Really, really nice of you.

mrleeman · 19 July 2008, 10:58

Alright, I did as I was told, but when I plug in the cable now, the picture flashes for a split second and then goes black again. What did I do wrong?

EDIT:

Haha, it was all down to my own stupidity. My soldering job was fine, I just forgot to set my scart switch box up accordingly. Thank you all! The picture is amazing!!!

danko · 11 March 2019, 23:18

Hi,i have the same problem there are the resistors on the RGB line i don't know value, why are there if there are problems after?

danko · 21 April 2019, 17:23

From DB23 video connector which are the audio pins?

theq · 21 April 2019, 19:47

Quote:

Originally Posted by danko

From DB23 video connector which are the audio pins?

None of them

danko · 21 April 2019, 19:48

Quote:

Originally Posted by theq

None of them

Ok thanks.

17 July 2008, 12:29	#1
mrleeman Registered User Join Date: Apr 2008 Location: Manchester Posts: 25	Amiga 1200 & RGB scart cable results in very dark picture Hello everyone, I bought an RGB scart cable for my Amiga 1200, but I'm dissatisfied with the resulting picture on my television. Although the picture is very stable and clean - as you'd expect it from an RGB signal - it is very, very dark . Any experience with this? Can I do anything about it? Through composite the brightness and colours are perfect. Thanks, Liam

18 July 2008, 07:05	#5
mrleeman Registered User Join Date: Apr 2008 Location: Manchester Posts: 25	Hey... thanks for the warm welcome! I do like it Retr0 . I used to have an A500 for many, many years, but then I sold it to buy my first PC - shame on me. Since I could never really get over it I finally decided that it was inevitable to get the real thing again after sticking with UAE for quite some time. So here I am now, proud owner of an as-new CD32 and a brand-new A1200 - and lovin' it Alright, tried my best to take the photos. Let me know if you need more Thanks! Attached Thumbnails

19 July 2008, 10:58	#12
mrleeman Registered User Join Date: Apr 2008 Location: Manchester Posts: 25	Alright, I did as I was told, but when I plug in the cable now, the picture flashes for a split second and then goes black again. What did I do wrong? EDIT: Haha, it was all down to my own stupidity. My soldering job was fine, I just forgot to set my scart switch box up accordingly. Thank you all! The picture is amazing!!! Attached Thumbnails Last edited by mrleeman; 20 July 2008 at 07:28.

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17 July 2008, 18:02	#2
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@mrleeman hello there, Welcome to EAB, theres plenty of re0licious mischief to get upto around here, so kick back and enjoy the honey coated retr0dom that this fair board provides now, from the sounds of it, the RGB cable has an abnormally HIGH draw on the RGB lines, although this could be the monitor that its plugged into. So to help, lets have a look at your scart lead/cable and take photos of the circuitry each end and we can then help to advise

17 July 2008, 20:50	#3
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	I suspect there are resistors on the RGB lines, if they are 75 Ohms and your TV is expecting 47 Ohms or none at all, this might explain it as the signal will be low. As Zetty says, a picture will reveal all.

17 July 2008, 23:42	#4
Anemos 70X7 Join Date: Apr 2008 Location: Ἑλλάς Posts: 1,078	probably exist resistances in the R-G-B cables, remove them and you will have bright signal.

18 July 2008, 09:07	#6
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	Yup, there are resistors on the RGB lines, they have been covered in heat shrink. I suggest you cut the heat shrink off the RGB signal lines and note the value of the resistors just in case (they are usually 47 or 75 Ohms, I've not come across any others being used). Remove the resistors, reconnect the wires and all should be ticketty-boo. Merlin

18 July 2008, 12:11	#7
mrleeman Registered User Join Date: Apr 2008 Location: Manchester Posts: 25	Okay, great. I'll try that and report back. Thanks a bunch!

18 July 2008, 14:20	#8
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@mrleeman I best advise you to ONLY Remove resistors from #pins #desc 07 blue 11 green 15 red Leave other resistors in place

18 July 2008, 14:55	#9
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	@ Zetr0, Yeah, the red, blue and green wires....... For those retro fans reading this thread in black and white, these are next to the yellow wire..... LOL

18 July 2008, 15:03	#10
TheCorfiot Amibay Senior Staff Join Date: Feb 2008 Location: Cardiff / Wales Posts: 1,302	@Merlin Do you mind I'm colour Blind!!!!! TC

18 July 2008, 16:07	#11
mrleeman Registered User Join Date: Apr 2008 Location: Manchester Posts: 25	@Zetr0: I read your post in time Had to get me a new soldering iron since my old one seems to be dead. The carnage is about to begin @Merlin: Thank you so much for offering your help in the WHDLoad thread. Unfortunately, I'm currently in Constance, Germany for my studies. Really, really nice of you.

11 March 2019, 23:18	#13
danko Registered User Join Date: Oct 2009 Location: Italy Age: 45 Posts: 196	Hi,i have the same problem there are the resistors on the RGB line i don't know value, why are there if there are problems after?

21 April 2019, 17:23	#14
danko Registered User Join Date: Oct 2009 Location: Italy Age: 45 Posts: 196	From DB23 video connector which are the audio pins?

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