Main > Monitor/Video Forum
How to use SCART for our hobby
Zebidee:
Lettuce, your cable must be relying on voltage from the VGA head on the video card. It could only possibly be supplying 5v to SCART pin 8 as the VGA head doesn't output 12v. Some VGA heads output 5v on pin 9.
ArcadeVGA cards put 5v to VGA pin 9, but I can't be sure of other manufacturers. Many of the VGA cables I've seen, perhaps most of them, don't even both with a pin 9. What video card do you use?
Depending upon your TV, 5v may be sufficient to trigger switching to AUX mode. Technically 5v signals AUX modein 16:9, but if your TV doesn't do that then it probably will simply signal AUX mode.
Does your cable actually work? I mean, so you get a PC picture on your Toshiba at all with this?
Also, as a BTW question - does this cable have an audio input plug to connect to your PC as well? I ask this because the audio pins are wired up.
lettuce:
--- Quote from: Zebidee on May 24, 2008, 09:38:38 pm ---Many of the VGA cables I've seen, perhaps most of them, don't even both with a pin 9. What video card do you use?
--- End quote ---
Im using a ArcadeVGA APG card :)
--- Quote from: Zebidee on May 24, 2008, 09:38:38 pm ---Depending upon your TV, 5v may be sufficient to trigger switching to AUX mode. Technically 5v signals AUX modein 16:9, but if your TV doesn't do that then it probably will simply signal AUX mode.
--- End quote ---
The TV im using it a, Toshiba 28N33B, its not a widescreen set just 4:3. Ive looked on the ulitmarc site and says pin 9 does indeed give a 5volt current (im guessing pin 9 on the VGA end?), im guess as you said its why my TV switches to the AUX channel when turned out from standby
--- Quote from: Zebidee on May 24, 2008, 09:38:38 pm ---Does your cable actually work? I mean, so you get a PC picture on your Toshiba at all with this?
--- End quote ---
When i first got it and tried it out the screen on the TV kept rolling so i had to resolder a wire i believe to stop this from happen, but i cant 100% remember as it was over 2 years ago. I did try it on another TV but i just got a black screen for some reason!? Just interested , why did you ask if the cable actually works?
--- Quote from: Zebidee on May 24, 2008, 09:38:38 pm ---Also, as a BTW question - does this cable have an audio input plug to connect to your PC as well? I ask this because the audio pins are wired up.
--- End quote ---
Yeah it does, but i never use them as im not getting sound form the TV itself
This from the Ultimarc site
"IMPORTANT: Our ArcadeVGA card outputs 5 volts on pin 9. If this pin is routed through your cable, make sure to insulate any cut wire to prevent shorting.
Be doubly sure about grounding whenever connecting monitors. Check the continuity with an ohm-meter of the monitor chassis to power-cord ground BEFORE connecting anything else up. Also double-check the isolating transformer is still connected (see below)."
So im guessing the cable i have is wired up to pin 9 on the vga end, im understand from reading the above that i dont need to have this pin 9 wired up to get a display??
Zebidee:
--- Quote from: lettuce on May 25, 2008, 06:45:24 am ---pin 9 does indeed give a 5volt current (im guessing pin 9 on the VGA end?), im guess as you said its why my TV switches to the AUX channel when turned out from standby[/b]
--- End quote ---
Your TV may well switch to Aux mode anyway, even without the 5v signal.
--- Quote from: lettuce on May 25, 2008, 06:45:24 am ---When i first got it and tried it out the screen on the TV kept rolling so i had to resolder a wire i believe to stop this from happen, but i cant 100% remember as it was over 2 years ago. I did try it on another TV but i just got a black screen for some reason!? Just interested , why did you ask if the cable actually works?
--- End quote ---
Two years ago, it might have been that you had to connect VGA pins 13 & 14 together to get the VSYNC input to stop the rolling.
Could be any number of reasons why the cable didn't work with your other TV.
The reason why I asked about whether the cable works is because if your videocard doesn't output 5v on VGA pin 9, then your cable WOULD NOT WORK.
Your experience with the other TV is interesting. I've wired up cables before with 5v -> SCART pin 8 -> 16 that have NOT WORKED on certain TVs.
As noted earler, I have a lot of success simply bridging SCART pin 20 (sync) -> SCART pin 16, and doing away with the 5v to pin 8 and the resistor bridge from pin 8 -> resistor -> 16 altogether. Simpler, neater, works (most of the time).
--- Quote from: lettuce on May 25, 2008, 06:45:24 am ---So im guessing the cable i have is wired up to pin 9 on the vga end, im understand from reading the above that i dont need to have this pin 9 wired up to get a display??
--- End quote ---
For the way your cable is currently wired, you definitely need 5v from VGA pin 9. However, you might be able to do away with it and bridge SCART pin 20 -> pin 16 instead (as discussed earlier in this thread).
Rather than hacking up your existing cable, I suggest that you make a new cable without the SCART pin 8 hooked to 5v, but with a bridged SCART 20 -> 16 instead and and try that. Mostly, the latter version works better. Personally, I have both types of cable on hand for testing new SCART TVs with. Occasionally I even need to try a cable that has both 5v -> SCART pin8 and a SCART 20 -> 16 bridge, but that is pretty rare.
Jox43w:
hi
im inn the uk and im going to have a go at building a scart for my soft15hz card, it wont be in a cab its a media pc i want to use as a mame console if you like, can i get away with not supplying any voltages if i manualy select av with my remote? also isit ok to just twist the wires togeter because im not good at soldering. lol
Zebidee:
--- Quote from: Jox43w on June 05, 2008, 07:18:45 pm ---can i get away with not supplying any voltages if i manualy select av with my remote?
--- End quote ---
Yes, you'll be fine.
--- Quote from: Jox43w on June 05, 2008, 07:18:45 pm ---is it ok to just twist the wires together because im not good at soldering. lol
--- End quote ---
Your cable will likely fall apart without soldering. However, if you can get a new SCART header with blades in it, you can use small quick-connects and crimp them onto your wires. But then, good crimping is another skill which you may not have ....
My advice: practice your soldering technique. ;D
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