RGB signal problem

Amiten · 02 September 2011, 17:14

Hi,

Recent I buy from Amibay an A1200 (Escom) Rev. 2B, the thing is I cant conect tru the RGB port by a Scart cable no image on there.

i use 2 diferent cables normaly i use with others Amiga and no problem.

I conect by RCA Video the signal ok, and olny I can Get image from RGB port if I connect by an 1084s monitor by VGA cable.

What happens ? any idea?

Thanks Regards and Amiga Forever.

alexh · 02 September 2011, 18:04

80% certain it is bad (lack of) voltage on the RGB select pin. (SCART pin 16)

If those cables work with other A1200's on the same TV that means there is something wrong with the A1200 you bought from Amibay.

If it works with other Amiga's (non A1200) it could mean that your SCART cables are incorrectly wired. They could wire to a pin which does not have any voltage on an A1200?

Amiten · 02 September 2011, 20:51

Hi,

yes cables work perfect with others A1200 on same TV

Thanks for the information, there its something I can do for Fix this problem?

P.D. (not buy from Amigakit was Amibay)

Regards
Amiten

alexh · 02 September 2011, 21:51

Work out which pin on the Amiga end of your SCART cable connects to SCART pin 16.

Post back here which pin it is. I can then tell you what voltage should be on that pin.

Measure the voltage on that pin on the Amiga to double check there is a problem.

Re-wire the Amiga end of the SCART cable to use a different pin.

FOL · 02 September 2011, 22:04

If its not that, it could be one of the ferrite beads blown. I have come across a few giving no RGB, but working fine on 1084 monitor.

Amiten · 03 September 2011, 18:15

Hi,

Sorry for my english I´m spanish, but how I do the testing?

can you explain me some esquematics or something.

what I understand to do its:

conect the Amiga get the tester and put (black or Red?) on the amiga RGB pin and with the another to the Scart, scart conected to TV? I think Not

ok them To the Female 23 din scart not conected to TV its ok like this to get the voltages ?.

thanks and regards.

FOL · 03 September 2011, 20:55

Quote:

Originally Posted by Amiten

Hi,

Sorry for my english I´m spanish, but how I do the testing?

can you explain me some esquematics or something.

what I understand to do its:

conect the Amiga get the tester and put (black or Red?) on the amiga RGB pin and with the another to the Scart, scart conected to TV? I think Not

ok them To the Female 23 din scart not conected to TV its ok like this to get the voltages ?.

thanks and regards.

Not sure who your directing this to.
For what I said, its inside the Amiga.

orange · 03 September 2011, 22:40

the black end goes to GND (pin 18 SCART), red to pin 16 on SCART.
(but it doesn't really matter much)

02 September 2011, 17:14	#1
Amiten Banned Join Date: May 2011 Location: Spain Posts: 519	RGB signal problem Hi, Recent I buy from Amibay an A1200 (Escom) Rev. 2B, the thing is I cant conect tru the RGB port by a Scart cable no image on there. i use 2 diferent cables normaly i use with others Amiga and no problem. I conect by RCA Video the signal ok, and olny I can Get image from RGB port if I connect by an 1084s monitor by VGA cable. What happens ? any idea? Thanks Regards and Amiga Forever.

02 September 2011, 18:04	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,356	80% certain it is bad (lack of) voltage on the RGB select pin. (SCART pin 16) If those cables work with other A1200's on the same TV that means there is something wrong with the A1200 you bought from Amibay. If it works with other Amiga's (non A1200) it could mean that your SCART cables are incorrectly wired. They could wire to a pin which does not have any voltage on an A1200? Last edited by alexh; 02 September 2011 at 21:48.

02 September 2011, 20:51	#3
Amiten Banned Join Date: May 2011 Location: Spain Posts: 519	RGB problem Hi, yes cables work perfect with others A1200 on same TV Thanks for the information, there its something I can do for Fix this problem? P.D. (not buy from Amigakit was Amibay) Regards Amiten

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02 September 2011, 21:51	#4
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,356	Work out which pin on the Amiga end of your SCART cable connects to SCART pin 16. Post back here which pin it is. I can then tell you what voltage should be on that pin. Measure the voltage on that pin on the Amiga to double check there is a problem. Re-wire the Amiga end of the SCART cable to use a different pin.

02 September 2011, 22:04	#5
FOL PSPUAE DEV Join Date: Nov 2006 Location: Wales / UK Age: 45 Posts: 6,012	If its not that, it could be one of the ferrite beads blown. I have come across a few giving no RGB, but working fine on 1084 monitor.

03 September 2011, 18:15	#6
Amiten Banned Join Date: May 2011 Location: Spain Posts: 519	Hi, Sorry for my english I´m spanish, but how I do the testing? can you explain me some esquematics or something. what I understand to do its: conect the Amiga get the tester and put (black or Red?) on the amiga RGB pin and with the another to the Scart, scart conected to TV? I think Not ok them To the Female 23 din scart not conected to TV its ok like this to get the voltages ?. thanks and regards.

03 September 2011, 22:40	#8
orange Registered User Join Date: Apr 2007 Location: Belgrade Posts: 567	the black end goes to GND (pin 18 SCART), red to pin 16 on SCART. (but it doesn't really matter much)

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