How to replace the whole keyboard?
I wanted to replace the whole keyboard, because about seven keys don't work. So in foresight that could last longer than changing single keys (like in the existing ifixit guide).
But this really looks bad (removed mainboard etc.) : http://i65.tinypic.com/rhjpth.jpg
the black spots aren't screws, they are rivets or I don't know how this is called correctly. So one chance might be: cut them all off.
Is the single key fix from ifix it always successful?
I almost forgot to tell the end of the story: Unfortunately I wasn't able to repair the keys itself. I'd really enjoyed that. So I ended up buying a new keyboard+frame for 45€ here: https://www.medion.com/lenovoserviceshop... Everything fine :)
I'm glad they've got a service shop for everybody accessible.