Keyboard Illumination Using Scroll Lock.

All of us have this key called "Scroll Lock" sitting in our keyboards doing NOTHING most of the time except for ( the most important part ) turning an on-board LED on/off. I use my computer in the dark many times and rely on my monitor to illuminate the keyboard, which is not quite good.
So , I hacked my keyboard to replace the tiny dim green indicator led with something else.
Open the keyboard to get access to the on-board LEDs.

Figure out which one is that of the scroll lock and de-solder it (or just cut the leads) .
Solder two wires in place of the leds.

Drill holes on the keyboard and insert the leds.
Connect 2 LEDs in parallel to the newly soldered wires. I also had to trim off a bit of excess plastic on the casing to make way for the wires.

The 2.5V output on my keyboard only allowed me to to connect 2 red or green leds. Other colours wouldn't light up with that supply.
Make sure the connections are OK and put the two parts back together and connect it to the computer.
If everything goes fine, turning the scroll lock on should illuminate your keyboard.

You could also use the caps lock and num lock indicators. But don't blame me if u find it difficult to use your keyboard when u want your keyboard illumination on...