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View Full Version : Will The Illuminated Keyboard Burn Out?




kkachurak
Feb 1, 2009, 01:53 PM
I was wondering if anyone could help me understand something...

I'm concerned that over-use of my illuminated keyboard feature on my new 2.4 MacBook will slowly burn it out.

Am I crazy?

I know that the new MacBooks use LED backlighting, correct? Which means, it'll never burn out or get dimmer?

Does the keyboard use the same technology?

Thanks in advance.



skorpien
Feb 1, 2009, 01:54 PM
Yes. It's LED backlit.

And no, it shouldn't burn out like a conventional bulb.

Edit: vv Cassie said it better. I meant to say it won't burn out as fast as a conventional bulb would...

SkyBell
Feb 1, 2009, 01:57 PM
Eventually yes. AFAIK, every kind of light burns out at some point. But your LED backlit keyboard will probably greatly outlast the useful life of your MacBook.

kkachurak
Feb 1, 2009, 02:08 PM
The reason I ask is, I still have a PowerBook G4 12" around the house. I've noticed that the screen is just too dim to see in ambient light anymore. It's really showing it's age.

I know the screen on that PowerBook G4 is a "LCD" screen (that's how it shows the image) but I thought it lit up by using a chemical (something magnesium?) Eventually, that chemical starts to get tired after so much use and stops becoming as bright.

I was under the impression that the new UniBooks used LED backlighting, which never get dimmer and never go bad. In fact, if you go to your energy preferences on an older apple laptop and set it to never let the display sleep, a message pops up saying "never letting your display sleep may shorten its life". This message does not pop up on my new MacBook when I set it to never let the display sleep.

So I just assumed the keyboard used the same LED backlighting. Which no one at Apple can confirm for me.

Saladinos
Feb 1, 2009, 02:19 PM
LEDs don't dim, but they do die.

Fortunately, they have a life of tens of thousands of hours, which translates to many, many years of average use (more than 10 years)

hacksaw-C87
Feb 1, 2009, 02:22 PM
In other words, crank up your LEDs!

alphaod
Feb 1, 2009, 02:34 PM
I know the screen on that PowerBook G4 is a "LCD" screen (that's how it shows the image) but I thought it lit up by using a chemical (something magnesium?) Eventually, that chemical starts to get tired after so much use and stops becoming as bright.


Just to clear some terms up:

LCD refers to the type of display panel, so both are LCDs (Liquid Crystal Display). However the new computers use LED (Light-Emitting Diode) back-lighting for the panel and the older computers used CCFL (Cold Cathode Fluorescent Lighting).

The difference is that CCFLs have mercury, requires time to warm up, and eventually dims. LEDs have no mercury, does not need to warm up (hence instance on), and instead of dimming, they just die.

As with the keyboard back-lighting, it is LED.

kastenbrust
Feb 1, 2009, 02:40 PM
LED's dont burn out so the Illuminated keyboard which is lit with LED's can't technically burn out.

Saying that, like everything LED's die eventually, but it can take hundreds of years, or simply one power surge or one drop of your laptop.

http://electronics.howstuffworks.com/led3.htm

kkachurak
Feb 7, 2009, 11:56 AM
Saying that, like everything LED's die eventually, but it can take hundreds of years, or simply one power surge or one drop of your laptop.

Thanks, Kastenbrust for scaring me ;)

ayeying
Feb 7, 2009, 12:01 PM
I thought we use a fiber optic based backlit and not LED? Or am I wrong there. This isn't my field of expertise so ya lol.

arthursiew
Feb 7, 2009, 12:38 PM
It's just like a light bulb and the MacBook's screen. The LED will eventually burn out, but since it's LED... it will last longer. Don't worry. If you're under AppleCare they will probably fix it when it's done or by the time it burns out... you'll be on another computer.

OrangeSVTguy
Feb 7, 2009, 01:38 PM
I thought we use a fiber optic based backlit and not LED? Or am I wrong there. This isn't my field of expertise so ya lol.

What do you think is on the other end of the fiber? The light has to come from somewhere ;).

Lord Blackadder
Feb 7, 2009, 01:42 PM
I have never, ever, seen an LED die, not in over 20 years of playing with electronic gadgets.

Which isn't to say they don't, but they are pretty darn long-lived. I think you are much more likely to lose other major subsystems to malfunction (HDD, RAM, display, PSU) than to have an LED die on you.

Of course, having said that, I'm certain to have it happen now. :rolleyes: