This guide is excellent. I bought a used wb150f which powered up, but did not respond to the control buttons on the back. Looking at these great high-res pix, I could see there was a mating connector between the button board and the main board, so I hoped I could re-seat that connector and it would start working. Opening it up was easy, but step 4 required me to separate the case slightly at the edges before I could get a gap to pry into. When I got the case off, I could see that the entire connector had come off the button board, and to fix it would be impossible due to the tiny pitch of the pins. Still, without this guide I would never have known for sure the issue. Back to Goodwill you go!