Basically, after a short fight with components and a soldering iron I have built a semi-functional Supergun. The sound works on one of my boards, not on the other, but I can deal with that later.[EDIT = Fixed this, was just a problem with the DIPswitch settings] The problem is the video. I've done it via an RGB Scart cable following the guide Here. Basically, the video out is alligned fine but the colours are all wrong (its all black and got minimal blobs of Red Green and Blue everywhere. Any idea what the problem could be? Outside of trying to re-solder it all, I'm clueless.
Have you hooked all the video grounds together and to system ground? If you've done that have you tried only attaching video ground to the SCART connector and not to the main system ground? Try: Red gnd + green gnd + blue gnd => video gnd (on SCART), and Red gnd + green gnd + blue gnd + system gnd => video gnd (on SCART) And are you sure you've got the pin numbers right on the SCART connector? Stone
All the grounds from the scart lead are connected together. I just tried connecting all the Scart grounds only to the Video ground on the JAMMA board and suddenly my picture is better, but still broken. Now, instead of just black its dark shades of grey for all other colours.....and anything that should be black is glowing red/green/blue. ===EDIT=== Here is a picture of the display - ===EDIT2=== Double checked my SCART wiring. Used this site as my guide - Here
Have you got the colours and their respective grounds around the wrong way? That would reverse the colour polarity... Stone
I just double checked with my multimeter and the colours/colour grounds are wired to the correct pins. I'm pretty much lost with this, the colours are all connected correctly... The only thing I can think of is that my video lead is made from a butchered Male to Male scart lead...could that have anything to do with it? I just don't understand what could be causing this >_<
Did you hook up the blanking signals correctly as well? I had a similar problem with my setup at first - I built it with a female socket on the Supergun and my male-male cable had two pins swapped (19 and 17, IIRC) so I couldn't get sync. Never seen that before though... However right you think you are you could try hooking up the colours and their grounds the other way anyway It's unlikely (not impossible!) to damage anything, and you could at least see if it helped... Are you sure the board's operating fine? Only other thing I can think of... Stone
I hooked up the "Blanking GRound" as stated on the site with the guide *points up to first post*. Hooked to pin 16 with a 100Ohm resistor. The only conclusion I can come to is my Video Sync is connected to the wrong pin....I think its supposed to be Pin 19 but mine goes to pin 20. Its due to the original tutorial I read being for a Female connector and mine using a butchered Male cable. Would this affect my colour though?
Okay, Just forget it. I'm giving up. I've tried so damn hard to just build it and it wont even work following simple wiring diagrams, so I quit. I am incompetant. All I've achieved is a slew of solder burns on my arm and lots of wasted wiring, bravo ¬_¬
Oh cmon man, give it another try. I got so close building an RGB to NTSC converter...but I am going to try again...this coming week on my christmas vacation (yay!). It's just SCART so it's gonna be simple...so...maybe you just missed something simple that you can't see. Give it another try! Start again from scratch. The parts are cheap and it can't take that long!
After a nights sleep I am in a more positive mood and shall try again! Most of what I have built is re-usable...I just need a new edge connector and a new SCART cable to rape, lol. I'll post again when I have my new parts and have fscked up again
Okay, so I'm back in the game of trying to construct my Supergun. Once again, audio works and video is fubar as it was before. I've tried all of the above advice twice. And yes, I'm still lost and feeling hopeless with this thing Am I stupid or something?
Well, it's 3am and I'm a bit too knackered to read through all the posts... but that picture makes me think your TV thinks it's getting a composite signal instead of RGB, and you need to provide a certain voltage on one of the SCART pins for that. If you want, I can help you on MSN, shoot me a message. My own Supergun is dead simple (I used a hacked DC RGB cable for the SCART part)
You connected the +5V to pin 8, then pin 8 to pin 16 via the resistor, right? Check that pin 16 is getting 1-3V. Any lower and it'll think you want composite. It might not like too high a voltage, either. Pin 20 in Composite in BTW, that is correct. Pin 19 is Composite out. ALL SCART connectors are numbered, whether male or female.
Thanks for your help everybody! I've finally got a nice clear RGB picture Turns out everything was correct, my stupid TV claimed to have an RGB scart port but it wasnt RGB....but I got a new TV and it now works beautifully! All I need to do is figure out a decent way to wire up the controls now..
Hehe, a good point! Many older TVs that had SCART are NOT RGB. And even the modern ones with 2 or 3 sockets, usually only 1 is RGB. Very few have 2 RGB SCART sockets.
