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How to use SCART for our hobby
SailorSat:
Sorry for bumping this back up :)
I just noticed that several of my AMIGA-to-SCART cables I have flying around here have +5v wired directly to Pin 16, and +12V wired to Pin 8, and they all work fine with my pretty old Grundig TV.
So I got a little curious.
I remember I've seen several SCART pinouts that state Pin 16 only has an input range up to 3V, while others say 5v.
So I've started to fool around with several (older) TVs over here.
Actually it seems you don't need +12V on Pin 8 and you don't need +5V either.
EVERY single TV I've tried works fine WITHOUT Pin 8 connected to anything.
The only "use" of it is to switch between a FORCED 16/9 or 4/3 mode. Some TVs also power on and switch to channel AV by themself if you supply power there.
Also every single of those TVs worked fine with +5V feed to Pin 16 instead of just 3V.
None of the blew up or something like that.
Conclusion... Though it may not work with every single SCART TV out there, the absolut simplest VGA-SCART cable would be:
--- Code: ---VGA - SCART
1 - 15 R
2 - 11 G
3 - 7 B
6 - 13 R-GND
7 - 9 G-GND
8 - 5 B-GND
13 - 20 Sync
14 - 20 Sync
5 - 17 GND
9 - 16 RGB-Switch
--- End code ---
I've modified my VGA-SCART cable that way and have yet to find a TV that does not work.
Also a friend pointet out that you can connect Pin 19 (Composite Out) to Pin 16, as the Composite Video has a signal level of 1V, which also should be enough to switch to RGB mode.
However I haven't yet tried that.
Zebidee:
Hi Sailor! Yes, you are pretty much right there about the no real need for 12v to pin 8. However, it does help to have the TV auto-switching to AV mode. What it comes down to is that, in most cases, you just need to make a simple cable that does what you need it to rather than adding on too many bells and whistles.
The only TVs that I have absolutely needed 12v to pin 8 for are TEAC TVs, and maybe AKAI but I'm not 100% sure. Oh, and there was one Sony PVM2730 I had once that had something wrong with the AV mode selector, so I used the 12v option.
The 5v to VGA pin 9 is only supported by some video cards, which includes ATI (& ArcadeVGA). And many VGA cables (e.g. recycled from old monitors, & even some VGA extension cables) do not even have a pin 9, which makes things a bit trickier again.
In many cases I dispense with the 5v as well, and just link SCART pin 20 to pin 16 for RGB mode activation. This works absolutely fine in 80% of cases and is really simple to make, no power inputs and no resistors or anything like that.
What brands of TVs were you testing?
SailorSat:
2 Grundig (one older 50Hz and a newer 100Hz one)
1 Thompson (rear projection)
1 Blaupunkt (I actually was suprised that ancient piece had a scart socket!)
several others as iirc one universum and once orion
Zebidee:
--- Quote from: SailorSat on June 26, 2009, 07:01:03 am ---2 Grundig (one older 50Hz and a newer 100Hz one)
1 Thompson (rear projection)
1 Blaupunkt (I actually was suprised that ancient piece had a scart socket!)
several others as iirc one universum and once orion
--- End quote ---
Directly linking SCART pin 20 -> 16 should most likely work well for the Grundigs, Thompson and Blaupunkt, even the 100mhz Grundig. I don't know about the universum & orion brands though.
sinkhead:
Hi,
Sorry if I'm being dim, but why is pin 18 (Composite video input ground) connected to the Molex return?
Pin 14 and the SCART casing are the return for the two currents coming from the Molex plug.
Many thanks.
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