When i press function and F6 it will go on for a few seconds but then it goes off and and i dont think the problem is the backlight itself but. whatever keeps it on. does anyone know how to fix this? mineis an aspire 5100
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Locate the Fn (Function) key on your keyboard. It may be on the bottom left side with dark blue letters. Locate the two "brightness" keys near the top of the keyboard. These will be in the "F" keys, possibly if F6 and F7. They should have little sun pictures or something similar to indicate brightness. Hold down the Fn key while pressing F7, or whichever "F" key your laptop uses to increase brightness. Tap F7 repeatedly until you reach the desired brightness. Fn must be held down as you continue to tap. Hope this helps.
Try finding an external monitor and hooking it up via the VGA port on the side of the computer. Once it's hooked up, hold down the function (Fn) key and find and press the key for external monitors (usually it's F4 or F6). It will probably look like two little squares with an arrow between them. Press that button a few times (waiting about 5 seconds between presses, and continuing to hold the Fn key) to see if anything shows up on the monitor. If so, then it's probably something to do with your backlight.
Sometimes what happens is your LCD backlight/backlight inverter stop working. These can be purchased and replaced, but it's not a very easy procedure. If you see something on the monitor let me know and I can try to help you with the disassembly process/ordering process.
If this doesn't solve the problem, then I would suggest that there was an issue with your motherboard, in which case you would usually hear some beeps on start-up. The beep codes will help you diagnose what's wrong. If you comment back with the beep codes (if this is the case, that is), I can look them up for you and see what you've got going on.
The inverter board which provides the backlight power isn't working properly. This is a pretty common problem with LCD screens. The inverter is in the display, mounted under the display panel. It's a fairly simple job to replace the inverter. You have to remove the screws holding the front of the display to the back and separate the pieces. The inverter is held in place by a couple of screws and has a couple of cables connecting it to the main board and display panel. Unplug those, remove the inverter, mount the replacement and plug the cables back in. Then reassemble the display. A search on Google for "acer 5315 inverter" turned up several sources for the replacement part. Here is one. I don't know anything about this seller; I just picked it as an example.
Your screen sounds fine, most likely just your backlight going out, either that or you could have hit the key for using an external monitor (function f6 is the LCD/external monitor switch for my computer). I'd look into the function f6 and play around with that, if not you can just buy a new backlight from ebay or an internet supplier.
If you have alot of important info it may be a REALLY good idea to back it up, if your laptop has a CD writer burn your data to disk before sending it off (remember to test any disks you make as you don't wish to lose data due to a scratched CD do you), or you can buy an external HDD or thumbdrive which you can save your important data to....If your data is important you really should be backing it up anyway.
It does sound like you have an underperforming backlight or PSU issue.
I hope this helps.