Amiga 500 to scart problem

Tolismlf · 08 July 2004, 22:36

Hi everybody.
I am trying to build myself a scart cable to connect my trusty A500 to a Phililps 14" Tv i have (the model is 14PT1353) but it seems to fail.
At last i managed to see graphics after trying some schematics that all were wrong and some lucky combinations, but after a while a shadow at the screen started to move slightly upwards as the normal amiga graphics were ok.
Any idea?

EmuChicken · 09 July 2004, 09:27

there is a lead available, I found the one for my A500+ from a carboot myself, I'm not too sure how its built, but it comes from the RF Modulator port (sort of like a parallel cable port) and then connects to the left + right audio inputs , and then finally to scart

Tried looking on aminet btw?

should maybe be some guides on there

Jope · 09 July 2004, 12:50

Quote:

Originally Posted by Tolismlf

Hi everybody.
I am trying to build myself a scart cable to connect my trusty A500 to a Phililps 14" Tv i have (the model is 14PT1353) but it seems to fail.
At last i managed to see graphics after trying some schematics that all were wrong and some lucky combinations, but after a while a shadow at the screen started to move slightly upwards as the normal amiga graphics were ok.
Any idea?

You might need the "mode change" signal (too lazy to look up the pin and correct signal name now) in the scart cable for the TV to switch to AV mode properly.

It's a certain voltage on a certain pin of the scart connector.. www.hardwarebook.net has the pinouts and also a scart cable schematic that should work.

Overdoc · 11 July 2004, 19:00

TV has to be set to RGB and probably also to AV mode to accept RGB signal at the SCART connector !
Either your TV can be switched to these modes, or you have to switch it by applying defined voltages at certain pins on the SCART connector. ( also too lazy to look it up now, but I think voltage levels are different on each TV )
Also on some TVs switching to videotext puts them into RGB mode

alexh · 20 July 2004, 09:57

Sometimes called "RGB Select", sometimes called "transparancy gate" sometimes called "fast blanking" and it DOES need to be driven.

The Amiga doesnt have Composite out on the Video connector and so Amiga SCART cables have no fall back if either your SCART socket doesnt do RGB or it is expecting to use composite if there is no "RGB select" signal driven.

It's PIN16 on the SCART socket and should be driven between 1v & 3v to select RGB, connect it to pin 22 on the Amiga socket via a 150 Ohm resistor.

08 July 2004, 22:36	#1
Tolismlf Junior Member Join Date: Jul 2004 Location: Greece Posts: 237	Amiga 500 to scart problem Hi everybody. I am trying to build myself a scart cable to connect my trusty A500 to a Phililps 14" Tv i have (the model is 14PT1353) but it seems to fail. At last i managed to see graphics after trying some schematics that all were wrong and some lucky combinations, but after a while a shadow at the screen started to move slightly upwards as the normal amiga graphics were ok. Any idea?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Amiga 500 display problem	gemstone	support.Other	3	20 August 2013 13:29
AMIGA 500 - Sound Problem	sebmacfly	support.Hardware	35	18 June 2009 06:24
Amiga 500-Problem transfer	Mika	New to Emulation or Amiga scene	9	23 March 2008 20:05
Amiga 500 Problem	Gary335	support.Hardware	8	19 October 2006 10:16
amiga 500 power problem !	Unregistered	support.Hardware	1	15 August 2002 00:27

09 July 2004, 09:27	#2
EmuChicken Senior Member Join Date: Jul 2004 Location: Nagoya, Japan (moved!) Age: 41 Posts: 746	there is a lead available, I found the one for my A500+ from a carboot myself, I'm not too sure how its built, but it comes from the RF Modulator port (sort of like a parallel cable port) and then connects to the left + right audio inputs , and then finally to scart Tried looking on aminet btw? should maybe be some guides on there

11 July 2004, 19:00	#4
Overdoc Commodore Collector Join Date: Aug 2001 Location: Austria Age: 53 Posts: 944	TV has to be set to RGB and probably also to AV mode to accept RGB signal at the SCART connector ! Either your TV can be switched to these modes, or you have to switch it by applying defined voltages at certain pins on the SCART connector. ( also too lazy to look it up now, but I think voltage levels are different on each TV ) Also on some TVs switching to videotext puts them into RGB mode

20 July 2004, 09:57	#5
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,397	Sometimes called "RGB Select", sometimes called "transparancy gate" sometimes called "fast blanking" and it DOES need to be driven. The Amiga doesnt have Composite out on the Video connector and so Amiga SCART cables have no fall back if either your SCART socket doesnt do RGB or it is expecting to use composite if there is no "RGB select" signal driven. It's PIN16 on the SCART socket and should be driven between 1v & 3v to select RGB, connect it to pin 22 on the Amiga socket via a 150 Ohm resistor.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)