In this guide I explain how to remove the keyboard and replace the launch board (aka button board) in a Lenovo 3000 laptop. As an example I took a Lenovo 3000 v200 laptop but I believe the disassembly steps will be the same or very similar for all models in the 3000 line. If my instructions work for you please mention the laptop model in the comments below.
The launch board is a board with the power and volume control buttons located under the keyboard bezel. I’m replacing the launch board because one of the volume control buttons got stuck in the pressed position and because of that the volume is set to maximum all the time. When I try turning it down, the volume slider goes up by itself. Cleaning the button with alcohol and contact cleaner didn’t help and I decided to replace the board.