Plastic sheet under keyboard

There's a thin matte black plastic sheet under the keyboard keys. Mine has developed air pockets under that sheet and when I type the keys press on the sheet and cause a plasticky crackling crumpling sound. Anyway to flatten out the plastic sheet?

 

What keyboard is this o.o? I guess you could pop the air bubbles? But I'd request a new keyboard.

 

T61 keyboard. Bought my laptop Nov of 2008. I've changed the keyboard twice already but always the air pockets will develop.

 

It is a membrane that keeps fluid off the key circuitry during a spill. Also makes the keyboard look clean looking down, instead of seeing the metal framework underneath.

What sort of conditions do you use your laptop in? Is it constantly running hot

 

Is humidity prone to cause this problem? That would make sense.

 

Laptop doesn't run hot and i don't use it for long hours at a time. BTW my last replacement already had small airpockets under the spacebar from the get go. I live in Singapore where it is a bit humid but these problems don't affect my friends who have T42s or T60s.

 

I have noticed this problem from time to time on my R61 keyboard (mainly the shift and Fn keys). I just thought it was something that happens with wear after a while. I have been pretty rough on my keyboard. It gets used alot and it does get pretty hot sometimes. I cant really tell any difference in typing on it from when it was new. The keys that get used the most do have a noticeable shine to them . Other then the noise you described and the key shine it still works great. I wouldn't worry about something so insignificant as long as its working fine. I still prefer typing on my thinkpad keyboard compared to other laptops/computers.

 

Yes Hrjustin, exactly the same in my case, always the same place, under the Fn, Shift, Alt keys. A little under the spacebar.

Anyhow is there anyway to flatten these 'pimples' out?

 

Btw a little off topic but my I've noticed my bios has the 'Security>Passwords>Passphrase' option greyed out/unselectable and also the 'Security>Passwords>Password Reset Service' refers me to set the service in ThinkVantage Recovery Media but there is no such option. Is it the same for you?