[G4] Cinema Display draws dotted lines

[sr ferenczy]

most LCD panels are rated with around a 50,000 hour life (this is 
actually the life of the light source that provides the backlighting) 
translated into actual usage, that would be about 5 1/2 years of 24/7 
use.

a 22 inch cinema display should not be at the end of its life yet. i 
have a 10 year old power book 180c that still has a working (albeit 
very dim) built in display.


in regards to the dotted lines, try something like this

http://homepage.mac.com/macguitar/FileSharing.html

to test the activity of the red green and blue pixels and see if you 
can pick out certain ones which are not responding correctly.
i have had a number (30-40) of pixels on multiple LCD/active matrix 
displays not respond/seem stuck, and the thing that freed them was a 
gentle massaging of both the pixel and the area around it, massaging 
hasnt failed me yet!

so, in conclusion, i would give the area a massage and see if it helps. 
there is no way the 22 inch CD (which was the top of the heap when it 
was released) should be failing already (and failure, most typically, 
means degradation of the backlight, rather than stuck pixels..)

good luck!

  sandor

On Tuesday, September 30, 2003, at 07:44  AM, Joseph B. Gurman wrote:

>     Mike Schneider wrote:
>
>> I got an older 22" Cinema Display on my G4 - that worked perfect until
>> last week. Don't know when I got it - but it was one from the
>> first/secon series (4-6 years old)
>>
>> Now, on the left side of the display, for about 5-10 centimeters, it
>> draws 'dotted' red lines from top to bottom
>>
>> when I press slightly on the border (not the lcd), the lines 
>> disappear.
>> It's puzzeling - when I startup the G4, it never drwas the lines - 
>> just
>> after working for a time (at the moment, the G4 is up for more than a
>> half hour, just with screensaver - no lines)
>> During the first occurencies, one single press solved the problem - 
>> but
>> now, I have to press again and again - until the lines disappear
>>
>> is my Cinema Display cabutto??
>
>     My, how time files when you have a nice display: the 22-inch 
> Cinema Display is only about three and a half years old. We got our 
> first ones in mid-2000, and those were the ones with the DVI interface 
> and the big cable harness, external power supply, &c.
>
>     I'm not familiar with your particular problem, though it certainly 
> sounds as though something is debonding. It's probably not 
> unreasonable to think of three years (the max covered under Apple's 
> combined system + display AppleCare extended warranties in the US) as 
> the natural lifetime for an LCD display. I lost a 17-inch flat panel 
> at home after only a year; sadly, it was purchased on its own, and not 
> covered by AppleCare.Fortuinately, I felt flush enough to purchase a 
> 20-inch Cinema Display as a replacement.
> -- 
> "I love deadlines. I love the whooshing sound they make as they go by."
>                                                             - Douglas 
> Adams, 1952 - 2001
>
> Joseph B. Gurman, NASA Goddard Space Flight Center, Solar Physics
> Branch, Greenbelt MD 20771 USA