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I have Dell Latitude D520 (for 3 years)

and my screen is dark.

I try to set to maximum and still dark.

Is the screen broken? Is it fixable?

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Take a look at these: superuser.com/questions/191725/… and superuser.com/questions/5892/… –  r0ca Oct 7 '10 at 16:04
    
It's probably just a blown inverter. I'm not familiar with this model so I can't tell you how difficult it is but it's probably worth your while to investigate the cost of the fix if you really like the machine... –  Shinrai Oct 7 '10 at 16:38
    
Diagnosis is the hard part, it could be a bad backlight (CCFL Lamp)...lcdparts.net/ccfl.aspx –  Moab Oct 7 '10 at 16:55
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1 Answer

Sounds like a hardware issue. Thankfully replacing the screen is not very hard and the should be fairly cheap. I recently had to replace one on a latitude e6400 the screen cost $115 direct from Dell and it took me all of 20 minutes to replace. I have replaced the RAM on many D series Latitudes which involves removing the the area around the screen and the keyboard. It is a very simple process just make sure you don't use a metal screwdriver (it will scratch) to pry the front plate off and also be careful with the keyboard. Other than that follow this service manual and you will be fine.

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