Hi and welcome to my first instructable! Enjoy :]
This is a very usefull instructable if you are a lot on your computer at night and don't want to make a lot of light in you're room!
Step 1: Requirements
These things you will need to start this project:
-Positive and negative cables
-Glue and tape could be usefull
-2 led's (you can choose what color of course)
Step 2: Start Working!
Picture 1: First of all you'll have to remove the back of your keyboard (look at pictures for details). When you open the keyboard you will see the electronics (don't break it or your keyboard will be dead)
Picture 2: The red cable is a positive cable. I connected another positive to it with my solder. Make sure it doesn't make connection with one of the other three cables of the USB. Then connect a negative cable (blue, black,...) with the black cable of the USB. When you've done that connect the two cables with the LED (the positive cable in the center of the LED and the negative cable on the border of the LED. And just do the same thing with your second LED. Make sure you make two holes in your keyboard to put the cables trough.
Then if you have all done it right your Illuminated keyboard would work if you connect your keyboard with your computer)
I hope this instructable helped you.
Step 3: Finishing Touch
You may add some tape around the cables so it looks nicer.
And this is how it looks like when it's activated