snaggletooth
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Post by snaggletooth on Feb 5, 2022 10:35:16 GMT
Did have a search for this but havent been able to find anything related, so hoping someone may be able to help. I recently picked up a Pal Saturn, to hook up to my retro setup, which works fine with other consoles. So it currently connects as follows.
Sega Saturn via Scart to OSSC Upscaler to HDMI switcher into back of LG OLED.
When first turned on it defaults to pass through mode, by default the TV streaches the Image to wide screen. So rather than change image output on the TV I just changed the upscale setting on the OSSC and in any mode other than pass through I get this weird Purple
Interferance flickering in bottom right of screen ( See Picture ).
So I changed the TV to force 4:3 output as it should and same issue, in Passthrough mode seems okay so far but any form of upscaling caused this issue. Initially I thought it was the Cable as one of the pins in that connects into back of saturn was bent, so ordered a new cable but the Issue persists.
I am going to hopefully take to a freinds to test on his CRT tonight which Im assuming will run fine, but just at a loss what is causing image problems, Is it sign of a developing fault with the console or just incompatability with my setup route.
Hoping someone might have some insight?
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Post by buckoa51 on Feb 5, 2022 10:44:54 GMT
The OSSC shouldn't default to pass through mode for 240p unless you changed it to specifically do so. If you're using a fixed resolution display, why would you do that?
Have you removed the switch from the equation to see if that helps?
What model LG is it specifically? On the C9, CX etc, you can set 4:3 or 16:9 regardless of input resolution.
Are you forcing PAL console to NTSC via means of a mod?
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snaggletooth
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Post by snaggletooth on Feb 5, 2022 22:39:15 GMT
Thanks for the reply buckoa51Well I just assumed OSSC was on passthrough mode when getting the clear picture, Its Picture mode 1 on the remote, honestly I'm a little green with using the OSSC, but given its displying images off PS1 via scart fine, thats what made me curious as to why Saturn had the glitch. Any way, I have now taken the HDMI switcher out the mix, and problem continues so I know its not that. Also taken the console round to a freinds and hooked up to a TV with a Direct Scart input and no display issues, so to my mind it has to be something to do with the Saturn not liking other display modes off the upscaler. Also its not a fancy oled, just one of the lower entry models, as its a second screen. Worst case I just use it without extra upscaling features, its not like the default picture is bad.
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Post by zyrobs on Feb 5, 2022 23:38:07 GMT
The ossc has a couple of different display modes, passthrough (this is nearly the same as directly hooking up the SCART cable), and Line2x to 5x. However it's a straight up linedouble/triple/4x/5x on each mode, which may output a kind of signal the TV will not like. On my TV, only Line2x works perfectly, Line3x has the picture shifted down some 20 pixels, 4x and 5x mode does not display anything.
So it's likely that your TV just doesn't like the signal generated by the OSSC.
There's also a shitload of fine-tuning options on the ossc for the output timings, hdmi tx modes, signal filtering, and so on - one of those might help.
also last time I checked the ossc worked fine with ntsc units, pal units, and 60hz modded pal units - so it's not the case of the Saturn not liking the ossc.
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snaggletooth
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Post by snaggletooth on Feb 6, 2022 11:33:24 GMT
Its interesting, Most of the line upscaling modes modes work fine with the TV when outputting from PS1 and PS2 I guess maybe PS1 has a differnt resolution output than Saturn?
Either way its not the end of the world, I have 1 display output that works I may have a tinker around with OSSC settings at somepoint if no joy may get a Rad2x see if that makes a difference.
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Post by buckoa51 on Feb 6, 2022 13:38:25 GMT
This depends on your TV, forcing a PAL unit into NTSC gives a way off spec refresh rate that some TVs can't handle. Since OSSC only line doubles it has to pass this refresh rate through unaltered, therein lies the problem.
You've tried adjusting V backporch right?
If your OSSC works at 2x mode then that's exactly what the Rad2X does (well actually OSSC outputs full RGB but it hardly makes a difference) so nothing to gain there at all getting Rad2X.
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Post by zyrobs on Feb 6, 2022 15:36:12 GMT
This depends on your TV, forcing a PAL unit into NTSC gives a way off spec refresh rate that some TVs can't handle. Since OSSC only line doubles it has to pass this refresh rate through unaltered, therein lies the problem. The pal60 mode also works from SCART input, so I guess the TV passes all inputs through the same chain and does processing (if any) based on that. That would explain why passthrough mode looks the same despite using HDMI input. But yeah, like you said it's TV dependent. With a hdmi to vga converter, using the vga input, I could get the other display modes working but then I got hiccups in the framerate - most likely because the either the TV or the converter expects to work with 60hz instead of 59.94, hence the hiccups. You've tried adjusting V backporch right? I've tried every setting, none of them made any difference.
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fishythought
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Post by fishythought on Feb 6, 2022 22:24:43 GMT
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Post by buckoa51 on Feb 6, 2022 23:31:23 GMT
Haha that's my video from years ago, but yes that's what I was talking about.
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fishythought
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Post by fishythought on Feb 7, 2022 22:21:41 GMT
Haha that's my video from years ago, but yes that's what I was talking about. Lol!, should have noticed the name on the channel
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