50hz

[samsc]

sven.

There is a small control panel which claims to be able to switch monitors to 50HZ.

SwitchRes X
http://www.madrau.com/html/SRX/About.html

I installed the demo once, and it did some really wierd things, and i couldnt find a way to uninstall it - so dont do this on a real system.

I also might have to make some slight software changes to run at 50Hz.

[samsc]

There also seems to be something called

DisplayConfigX which does the same thing.

I really havent tried or installed this....

http://voodoofx.all.de/displayconfigx/

this looks quite geeky and scary - but seems to give a lot of control....

[Sven]

Ok. Thanks. I will play around with it when I get a moment.
Very useful to find out all those things which have been disovered in this thread.

Sven

[samsc]

Ok. Thanks. I will play around with it when I get a moment.
Very useful to find out all those things which have been disovered in this thread.

Sven

dont play on a live machine, it might break something....

[samsc]

sven.

if you can make your monitor work at 50hz, i can make a change to the software to help support this.

[samsc]

update to display config:

http://www.macupdate.com/info.php/id/13375

[RichieS]

maybe not an option, but a decent scan-convertor should fix this...

saw a similar problem with the guys on riverdance - running single output 1024x768 75Hz w/Extron scan-convertor to two Barco R18s.

they use black/white strobe for one of the cues. The effect is exactly as Richard describes previously with the DL1s - A very clear banding three-quarters of the way down the image.

I tried every acheivable combination of resolution/refresh-rate. Even tried making the black a very dark blue in case the projector was seeing these frames as a lack of signal???

only way to make it go was to use a Folsom ImagePRO scan-convertor which will happily sit at 200Hz. (As far as I remember, the banding dissapeared at 100Hz)

not sure of your setup there - sounds like you're going 1280x1024 direct into the projectors?

If you're using a scan-convertor, I'd try tweaking there before you make any changes on the G5 - I think your input frequency to the R18s wants to go up instead of down!

Could even be projector problems? If there's a grounding or phasing issue between the signal source and the R18s, it's possible you'll see exactly the same flicker on every projector.

I'm sure you've tried this already, but if it's isolated to individual projectors be sure to try cross-plugging all your inputs in case its something like a convergence problem on the projector, or all your sources to eliminate any scan-convertor issues

Anyway, hope you get to the bottom of it.

Have you had any more problems with the G5s?


Rich Stembridge