Main > Monitor/Video Forum
How to use SCART for our hobby
LeedsFan:
--- Quote from: Zebidee on April 28, 2010, 07:09:47 pm ---Yes, if the cable is good then It should work on the Samsung, assuming that you have the TV in the right video mode etc ... although the cable itself should auto-select most of this.
If you like, I can make a cable for you for a fair price + shipping. The cable would be fully tested with multiple SCART TVs before leaving my hands. If for some wierd reason it doesn't work for your equipment, you can return it to me for full refund (less shipping) within a reasonable period. However, I have never had an unhappy customer.
Your VGA-SCART cable would have a molex plug for 5v & 12v input from PC, and look something like this:
--- End quote ---
OK I might just take you up on that offer. I'm in London for the weekend and I'm gonna have another go at making this cable when I get home. Got a new soldering iron as my other one was too big really for the small pins. I will let you know how it goes when I get back. :D
Zebidee:
No worries, PM me when you're ready.
For reference, when makling this cable I generally don't use a soldering iron (except for the 100ohm resistor bit). I usually use 2mm female brass connectors and just slip them over the male blades, as shown in the attached pic. Use heat shrink tubing or tape to insulate the female ends. Heck of a lot easier than trying to use a soldering iron, and a lot more flexible as you can change things around or even disconnect the pins if you have to (for example, one sometimes forget to put the SCART end's plastic collar on before wiring pins up - it is much easier to deal with if you can just pull the connectors off with pliers and then slip the collar on).
If you do this no-soldering (almost) method, make sure to buy the SCART header with the almost flat blade (male) connectors (there are two kinds).
Kman-Sweden:
So how 'bout "true" RGB to Scart?
From a real arcade PCB you can get
R
G
B
VidSync
VidGND
+5V
+12V
GND
Should I use the VidGND as R-, B-, G-return? and GND as GND (eg pin21)?
Zebidee:
I have successfully mounted SCART TVs & presentation monitors as arcade monitors with JAMMA inputs. Check earlier in this thread.
If it was me, I wouldn't get too hung up about SCART pin 21 - it is only the shield ground. Most arcade monitor inputs don't have any shield, so cab wiring won't accomodate for it. If desired, you could hook the shield pin to either VidGND or the power GND, but vidGND will be easier unless you are running power signals in anyway.
I recommend that you put 75 ohm resistors on the R-G-B inputs, as JAMMA PCB (& JPACs) put out these signals at levels too high for TVs. You will need the resistors to bring down signal voltage level, otherwise the TV image will be way too 'bright' and would likely cause screen or other component damage in the long run. 75 ohm (or 68ohm is close enough) should be right on the money for this, but if your TV is unique then maybe you could vary the values slightly (e.g. down to 47ohm, or up to 100 ohm)
You don't need any resistors on the SYNC input - that should be OK.
Some PCBs might put out separate H & V syncs, rather than composite (more likely w/ older PCBs). This could be a problem if one of the syncs is not negative, because you can't easily combine +'ve & -'ve syncs without a little bit of conversion circuitry.
There would be no problem with tapping into the 5v & 12v for RGB & AV switch9ing signals. However, consider that you may be able to get away with just making a little wire bridge to short between SCART 20 and SCART 16 to get RGB mode on your TV.
I'm about to wire a Grundig TV into a JAMMA arcade cab. I'll post a pic after it's done.
Kman-Sweden:
Cool.. So VidGND to all the 4 returns, 75 Ohm resistors on the R, G & B.
Sync to sync. Sync to 16 might be enough for AV-switching..
I'll be waiting for the pics.. :D
BTW I'm building a Supergun for Jamma and NeoGeo MVS... I'll post here if you like, when I get it working..