Today I have made an interesting discovery: my 2008 2.4 GHz MacBook Pro is using frustrated total internal reflection (FTIR) for the illumination of its keyboard.
The background to this discovery is that I spilled a bit of salad dressing into my keyboard (pro tip: do never try to show someone the salad you are currently eating via skype) and since then some of my keys are not working reliable anymore. To be more precise: Some keys I must push two or three times until they produce the letter. Thus, I wanted to look if I could clean the keyboard and what kind of keyboard I would need if I wanted to replace it. I used the MBP iFixit guide to achieve the disassembly (and as I have been a lucky guy also the reassembly).
Anyway, when I removed the keyboard compartment from the MBP’s body I discovered that it consisted of four parts: