TV problems

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Kilo
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TV problems

Post by Kilo » Wed Jan 30, 2013 8:34 am

Hey guys,

I've got a newer LCD tv with PAL and NTSC signal..
so, when I'm playing on the Uzebox the signal between PAL and NTSC changed randomly that there will be a black screen for a second!
Nothing bad, but it sucks! It's like the tv doesn't know which signal to use!
Is there any possibility to fix it on hardware? maybe stabilize it with capacitors or something?
The last digit of Pi is 7! I calculated this, as I counted to infinity yesterday!

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Janka
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Re: TV problems

Post by Janka » Wed Jan 30, 2013 2:38 pm

Do you use an Uzebox or an EUzebox?

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uze6666
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Re: TV problems

Post by uze6666 » Wed Jan 30, 2013 7:17 pm

Weird issue, never heard this one before. Did you test on another tv?

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Kilo
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Re: TV problems

Post by Kilo » Wed Jan 30, 2013 7:58 pm

I'm using an Euzebox!

No issue on other TV's! Hm... but it's a new tv.... I can choose between the different sources. So I use SCART but the signal always changed between PAL and NTSC
The last digit of Pi is 7! I calculated this, as I counted to infinity yesterday!

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DaveyPocket
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Re: TV problems

Post by DaveyPocket » Thu Jan 31, 2013 10:47 pm

Maybe timing issues? Maybe the new TV doesn't like the way the NTSC timing on the Uzebox works. Could be wrong though.

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uze6666
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Re: TV problems

Post by uze6666 » Thu Jan 31, 2013 11:21 pm

Yeah, most probably a timing issue. If you have an old nes, snes or megadrive test then on the tv, the uzebox use the exact same timing.

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Janka
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Re: TV problems

Post by Janka » Fri Feb 01, 2013 12:46 am

uze6666 wrote:If you have an old nes, snes or megadrive test then on the tv, the uzebox use the exact same timing.
I doubt the OP has an NTSC version of these consoles.

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uze6666
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Re: TV problems

Post by uze6666 » Fri Feb 01, 2013 1:16 am

Old consoles with NTSC used 524 lines instead of 525. That's 262.5 lines per field and for some reasons that .5 caused a lot of flickering for me. Incidentally I checked the signals with my scope with my old consoles and they all used 524 lines. I'd assume PAL is the same since it uses 625 lines. Unfortunately I don't think much can be done, it all depends on the sync decoding hardware or software. I bought some small LCDs with TV-in lately and none could sync on the Uzebox or my snes.

That said I'm wondering if the TV could be fooled by adding an extra line on one of the two fields...

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DaveyPocket
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Re: TV problems

Post by DaveyPocket » Fri Feb 01, 2013 3:00 am

My friends LCD has a "bouncing" problem with old video games and other devices. If it can't sync right the image will start bouncing. It can be fixed though by just removing and reinserting the video cable until the image fixes itself. I can't think of a solution other than some external circuit that could maybe mess with the sync line to sync correctly.

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Kilo
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Re: TV problems

Post by Kilo » Fri Feb 01, 2013 10:23 am

I will try to disconnect the video cable while running and connect it again...
That's the problem with new technologie, when the systems automatically adjust anything!
The last digit of Pi is 7! I calculated this, as I counted to infinity yesterday!

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