fix (hack) for 30" Cinema HD display dancing pixels
hi all,
Daniel Hartman seems to have figured out what's wrong with the 30" displays that show dancing pixels (or if he hasn't figured it out, he seems to have found a partial solution.)
Since the find is buried in 200+ posts about the problem, I thought I'd start a new thread to point it out. The whole discussion can be found here, but basically the crux of it is that there's a problem with one DVI channel that can be ameliorated by slightly slowing down the refresh rate. Read the post for more detail, but for those running OS X 10.3 or higher, you can use SwitchRes X to slow down the refresh. Here's how:
Install SwitchRes X, then from the SwitchRes Control Panel (located in System Preferences) click "new..." under resolutions>custom. Modify the vertical scan rate to 58 Hz, and make sure to press tab so that the setting 'takes' (little bug). Then click "OK", followed by "apply" in the control panel. Reboot and you'll have a 58Hz full-resolution setting as an option both from the drop-down SwitchRes menu bar icon, and from the Displays icon in system preferences. If you then decide to remove SwitchRes X (using the unistall option in the installer application), the 58Hz setting stays as an option under System Preferences>Displays.
Bear in mind this is a work-around, not an actual repair. For me this got rid of nearly all the pixel anomalies, but my screen will most likely still be sent in for repair/replacement at some point. But for those who can't live without their screen and need a fix now, this just might be the ticket.
Daniel Hartman seems to have figured out what's wrong with the 30" displays that show dancing pixels (or if he hasn't figured it out, he seems to have found a partial solution.)
Since the find is buried in 200+ posts about the problem, I thought I'd start a new thread to point it out. The whole discussion can be found here, but basically the crux of it is that there's a problem with one DVI channel that can be ameliorated by slightly slowing down the refresh rate. Read the post for more detail, but for those running OS X 10.3 or higher, you can use SwitchRes X to slow down the refresh. Here's how:
Install SwitchRes X, then from the SwitchRes Control Panel (located in System Preferences) click "new..." under resolutions>custom. Modify the vertical scan rate to 58 Hz, and make sure to press tab so that the setting 'takes' (little bug). Then click "OK", followed by "apply" in the control panel. Reboot and you'll have a 58Hz full-resolution setting as an option both from the drop-down SwitchRes menu bar icon, and from the Displays icon in system preferences. If you then decide to remove SwitchRes X (using the unistall option in the installer application), the 58Hz setting stays as an option under System Preferences>Displays.
Bear in mind this is a work-around, not an actual repair. For me this got rid of nearly all the pixel anomalies, but my screen will most likely still be sent in for repair/replacement at some point. But for those who can't live without their screen and need a fix now, this just might be the ticket.
