Amiga RGB - SCART cable - How to wire it?

[mingle]

Hi,

I have an Samsung SyncMaster 17" LCD monitor/TV which has an (RGB)SCART connector on the back and I'd like to make up a cable to be able to connect my A1200 up to it (via the RGB port)... It's a UK-spec TV, some I'm hoping to get a decent picture via the SCART input...

I did a Google, but came across a number of variations of Amiga-SCART cables...

Just wondered if anyone (who has/had their Amiga connected to an LCD telly using a SCART cable) could tell me the wiring combination that worked for them?

Cheers,

Mike.

[Skippy]

Hi there Mingle, a couple of links and some snapshots.

I use the Samsung SM2032MW with an RGB-SCART cable for my a1200, works a charm.

Pinouts:
http://amigarealm.dtdns.net/amigarealm/resources/pinouts.htm

Scart/RGB Diagram:
http://www.jeacle.ie/pub/articles/scart/

Some dodgy webcam snapshots of my cable:
http://amigarealm.dtdns.net/tmp/scart/

Take care,

Skippy.

[mingle]

Hi Skippy,

Thanks for the info...

Your pics show a few resistors too - including one of the composite-sync (SCART pin-20)... Did you follow the additional instructions in the article you mentioned?:

http://www.jeacle.ie/pub/articles/scart/

Don't suppose you have a nice, clear  diagram of your cable?

Cheers,

Mike.

[alexh]

The only resistors you should need will be on Pin 16 Fast Blanking (aka RGB select) and on Pin 8 (AV Select)

[Framiga]

mingle wrote:
Hi,

I have an Samsung SyncMaster 17" LCD monitor/TV which has an (RGB)SCART connector on the back and I'd like to make up a cable to be able to connect my A1200 up to it (via the RGB port)... It's a UK-spec TV, some I'm hoping to get a decent picture via the SCART input...

I did a Google, but came across a number of variations of Amiga-SCART cables...

Just wondered if anyone (who has/had their Amiga connected to an LCD telly using a SCART cable) could tell me the wiring combination that worked for them?

Cheers,

Mike.

are you sure that your monitor/tv supports analogic RGB+Sync through SCART? mine seems not.

Try to post here the exact model name

[mingle]

I'm pretty sure it does support RGB (not sure about the difference 'sync' makes?), as the SCART port is labelled "EXT(RGB)"...

Well, I hope it does!

The model number is 711MP.

Cheers,

Mike.

[Framiga]

That "EXT(RGB)" seems a good yes , indeed! :-)

I have here a LG 19LS4R that doesn't works with the STB in RGB mode (looking now at the monitor/tv schematics)

Edit- just for the record ... after looking at the schematics, even my LG supports RGB over SCART.

Everything pointed in a defective SCART cable (red channel wire knackered) :-)

[Skippy]

The resistors are on the correct pins. It's a commercially built RGB SCART cable that I have successfully made replicas of for use on my other Amigas.

If you require any further information, Mingle, just let me know. I do recommend making one of these cables to compliment your LCD's clarity.

Le Skip

[mingle]

Hmm...

I tried feeding 12V DC (via a 1amp mains transformer) onto pin 8 and I got an intermittent rolling image, but also a burning smell from inside the TV! So I immediately switched off!

Hopefully I haven't foobarred it up! :-)

There are so many conflicting articles and diagrams and what value resistor (if any) need to be connected to the +12V (pin 22) and +5V (pin 23) before the signals are fed into the SCART connector.

Does anyone know what value resistors I need to add to pin 16 and 8 (of the SCART plug)?

Cheers,

Mike.

[Skippy]

Well for the price of you not knowing what you're doing and resulting in costly damage to your equipment, I'd strongly recommend you simply purchase the cable for a mere £15.
http://amigakit.leamancomputing.com/catalog/product_info.php?cPath=21_72&products_id=226

[mingle]

Hi Skippy,

The problem is that there are about 4 different cables around (with different combinations of resistors, connections, etc) and there's no guarantee that a commercial cable would work.

I'm fine at making cables up, all I need to know now is what resistor values to use on the 12 & 5V supplies into the SCART connector...

Cheers,

Mike.

[mingle]

Hey skippy,

Just looking at the pics of your cable...

What are the resistor values you're using - particularly on pin 20 of the SCART connector..?

Cheers,

Mike.

[Skippy]

I used

 1st band: Brown
 2nd band: Black
 3rd band: Brown
 4th band: Gold

SkippyFox

[mingle]

@alexh,

I'm still trying to figure out the resistor values and wiring (from skippy's dodgey webcam shots!) with little success...

My TV has a button to select the video source (RF, AV, S-Video, SCART, RGB), so I'm not sure if I'd still need pin 8 wired to 12V?

Also, some diagrams show the 12V on the Amiga RGB port (pin 22) being used to drive pin 8 and pin 16 (through a resistor) on the SCART end, whereas some show the Amiga 5V (pin 23) being used for pin 16 (again, via a resistor) - is one way preferable to another?

Skippy's pics also show a resistor on pin 20 of the SCART plug (composite sync), which is the only instance I've seen of this - all other diagrams only show resistors being used on pin 8 and 16.

I'm stuck at the moment and would appreciate any comments to help with the wiring.

Skippy - if you're reading this - a simple diagram of your cable would be a great help! :-)

Cheers,

Mike.

[twizzle]

http://www.avishowtech.com/mbhp/res.html

here is the site to find out your resistor values

the 1 that skippy is using is 100hms +/-5%