jwalshy Posted November 11, 2014 Share Posted November 11, 2014 Hey guys, I know that this poor horse has been beaten to death on the forums but i need some advice. I have an Atari 1040STe with 4mb memory upgrade. I have a spare LG 27" TV thats sits nicely next to my iMac. My plan is to use the TV for both low/medium and high res via din->scart and din->VGA for the Atari, as well as a secondary monitor for my iMac via HDMI. The problem is the quality of the picture of the Atari. When i view it via the Din->Scart cable in low or medium resolution the screen seems to jump every few seconds, apart from this the picture is good, however, this screen jumping makes playing games impossible When i view the atari in hi res via din->VGA, i get very slight constant flickering. When i plug the Atari into my cheap VGA monitor i don't get anywhere near as much flickering. Not sure if this may be a cause of the problem but, I should mention both the din->vga and din->scart cables have stereo audio breakouts as the rca audio out ports on the machine seem to be playing up (seems the output is way too hot and the volume doesn't match L + R, but i'm going to look into this once I've sorted the screen thing.) So to summarise; plug in via scart i get occasional screen jumping, and plug in via vga i get slight flickering. What do you guys reckon? Thanks so much! Quote Link to comment Share on other sites More sharing options...
locnar77 Posted November 11, 2014 Share Posted November 11, 2014 composite out on all ST's sucks. If you look about 10 posts down from this you still see someone making a componant video out box. that is your best bet Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 11, 2014 Author Share Posted November 11, 2014 (edited) composite out on all ST's sucks. If you look about 10 posts down from this you still see someone making a componant video out box. that is your best bet Hey locnar, thanks for the reply. I thought that scart carried a component (RGB) signal already? edit: just checked and the 13 pin din -> scart cable i bought was labelled as RGB Edited November 11, 2014 by jwalshy Quote Link to comment Share on other sites More sharing options...
locnar77 Posted November 11, 2014 Share Posted November 11, 2014 Well i have heard of people having an issue with scart. But that i dont know for sure. We dont use it in. North america. But for vga. Nothing ive tried works very well. Im hoping this componant video works better. Or there is always pick up a 1224 monitor. Quote Link to comment Share on other sites More sharing options...
krupkaj Posted November 11, 2014 Share Posted November 11, 2014 I had a big trouble with LG monitor/TV 27MA73D. I think it behaved very similar to your TV. There was a problem with the switching signal connected to pin 16 on the SCART. Usually the pin 16 is connected to Vertical Sync from the ST. I made this little modification in the cable, all components fit inside the SCART connector And now it works really well. I had do the the same cable fo Jaguar. The cable works on my LG and Grundig TV Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 12, 2014 Author Share Posted November 12, 2014 Thanks for the replies guys, I'll look into modding the cable krupkaj, I not I'll just have to rule it out as incompatibility and search for a suitable tv Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 12, 2014 Author Share Posted November 12, 2014 I had a big trouble with LG monitor/TV 27MA73D. I think it behaved very similar to your TV. There was a problem with the switching signal connected to pin 16 on the SCART. Usually the pin 16 is connected to Vertical Sync from the ST. I made this little modification in the cable, all components fit inside the SCART connector And now it works really well. I had do the the same cable fo Jaguar. The cable works on my LG and Grundig TV Hey krupkaj, What diode is used here? Or doesn't it matter much? Also, on the capacitor does 10m mean 10uF (10 microfarad)? Cheers! Quote Link to comment Share on other sites More sharing options...
krupkaj Posted November 12, 2014 Share Posted November 12, 2014 the diode prevents the voltage to go back to atari. and yes the capacitor is 10 microfarad Quote Link to comment Share on other sites More sharing options...
Rybags Posted November 12, 2014 Share Posted November 12, 2014 Some chips on modern TVs expect an exact framerate from analog inputs, which most of our old computers don't match (e.g. 262 when 262.5 expected). The result can be that you get glitches in time with the actual and expected framerate being in sync with each other. So... NTSC every ~ 4.33 seconds, PAL every ~ 6.26 seconds. Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 24, 2014 Author Share Posted November 24, 2014 the diode prevents the voltage to go back to atari. and yes the capacitor is 10 microfarad Krupkaj, sorry for the delay in replying, i wanted to try all other options before taking the cable apart. But i took it apart put in the components as you said, and it worked! Im so pleased, thanks a lot! It still isnt quiiite perfect; when the curser hovers over a new menu item ie placing the arrow over "view" then moving over "options", the text items that are highlighted 'buzz'; they kind of go fuzzy just for second, then go back to being crystal clear. When playing games with lots of movement or during playback on cubase and trackers all is fine and there is no buzzing of lines. Would this possibly be down to the components ive used? or is there anyway to rectify this? thanks a lot for your solution! Quote Link to comment Share on other sites More sharing options...
krupkaj Posted November 24, 2014 Share Posted November 24, 2014 (edited) it is great it works for you too. I think the "buzz" is caused by the processing of analog signal in the TV. Maybe you culd try to switch off some enhancement. I think there is lot of them Edited November 24, 2014 by krupkaj Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 26, 2014 Author Share Posted November 26, 2014 it is great it works for you too. I think the "buzz" is caused by the processing of analog signal in the TV. Maybe you culd try to switch off some enhancement. I think there is lot of them I got rid of all enhancements on the TV and it still seems to be doing it. When wiring in the capacitor pin 13 from din went to 21 ground on scart rather than 18 seen on the schematic, so I wired it this way and kept 13 going to 21. Would this make a difference? Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 26, 2014 Author Share Posted November 26, 2014 Erm, I'm confused now as it seems there is no pin 21... Unless that is the actual metal outer surround of the scart plug? Hmm... Quote Link to comment Share on other sites More sharing options...
krupkaj Posted November 26, 2014 Share Posted November 26, 2014 exactly the pin 21 is the metal surround (chassis) and it should be connected to the ground. Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 27, 2014 Author Share Posted November 27, 2014 Ok, I have connected it this way and still have the "buzzing". I was wondering if I took the rgb and audio left and right from the din pin and ran these to 5 phono plugs would this work? As my TV has rgb phono breakout inputs Quote Link to comment Share on other sites More sharing options...
jwalshy Posted November 27, 2014 Author Share Posted November 27, 2014 They are ypbpr inputs Quote Link to comment Share on other sites More sharing options...
krupkaj Posted November 28, 2014 Share Posted November 28, 2014 YPbPr is different input. You need a converter from RGB to use it. 1 Quote Link to comment Share on other sites More sharing options...
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