OS X Login screen burnt onto iMac G5 screens

[Thank The Cheese]

Hello everyone,

At work there is a real problem with the login screens being "burnt" onto the screen from being kept on the same screen all night. There are 2 iMacs that I know of which have had this happen.

I have always thought LCD screens don't suffer this problem, so I thought maybe it could be caused by something else (maybe a graphic card problem?).

 

[DeltaMac]

It is not possible for an image to burn-in permanently on an LCD screen.

Although LCD screens can have an image remaining on the screen for a short time, (a result of 'persistence'), you will find that turning the power off for as much as 24-48 hours will cause any lingering image to dissipate with no trace.

I have 2 G3 iMacs used as servers, no screen saver, and powered on virtually since new. Both have permanently etched CRTs. An LCD will not suffer this same fate.

 

[fryke]

While it's comforting that you state it can't happen, that doesn't help if it _does_ happen. Are you sure about the 24-48 hours? My PowerBook's screen has been turned off for longer periods of time, and still the Mac's menubar is clearly visible when the display should only display a full, for example red, screen.

But shouldn't the displays automatically turn off when they're at the login screen for more than a few minutes? Is that something that can be set? (User preferences of course wouldn't matter there since there's no-one logged in when you're at the login screen...)

 

[DeltaMac]

Are you sure about the 24-48 hours? My PowerBook's screen has been turned off for longer periods of time, and still the Mac's menubar is clearly visible when the display should only display a full, for example red, screen.

It's still all about persistence. No permanent damage can take place, as compared to a CRT display. Rest time for an LCD will eventually relax any persistence. 24-48 hours is just a normal amount of time for that recovery. It's not a permanent thing.