I CAN READ MY SCREEN BUT ITS DARKER THEN ID LIKE IS THERE AN ADJUSTMENT SOMEWHERE ON MY ASPIRE 3690?

I believe that you need to press the Fn and Right Arrow keys (at the same time) to increase brightness and the Fn and Left Arrow keys to make it less bright.

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Your screen inverter is going bad, you will need to replace the screen inverter. You can parts on ebay, and you may need to take your computer apart to get it replaced.

It sounds to me like your screen has gone and needs to be replaced

See if there is a contrast adjustment somewhere on the laptop first, if not then its a possibility your back light has gone and needs replacing.

Below is a link to the service manual that will assist in the disassembly and troubleshooting. The manual is in PDF format and is free to use, copy and print.

http://tim.id.au/laptops/acer/aspire%205680%205630%203690%20travelmate%204280%204230%202490.pdf

There screws all around the lcd that are hidden by black rubber / plastic.

Examine the plastic and you'll see them. Pop them off with a straight blade screwdriver.

Then just unscrew all the screws. Most use only 4-6 screws.

Once they are all out. Carefully pull the plastic housing off with your hands. You shouldn't have to use much force so try to be gentle.

Afterwards you should be able to take it from there. There will be brackets holding the lcd in place.

Take those out and then remove the lcd cable from the back of the screen and the inverter from the bottom portion of the lcd.

Swap the lcds and put everything back together.

That should do the trick.

Let me know if you get stuck.

Hey, you are in luck, I bought myself a aspire 3100. It has the same problem I'll get it from the post office today, I'll let you know how I fixed it or what the problem is if I can't fix it.

stay tuned, Id say I'll get back to you with a solution in 24hours.

try to install luanch manager. you can download it from acer website.

the problem could be that you accidentally pressed some button so the computer gets darker so it can save more energy...

that tends to happen when you press Fn + (a but with a screen a sun and a +)

i hope that helps..
otherwise.. your laptop could be having contact problems on the little thingies that hold the screen.