I bought a Lenovo Yoga Pro 2 couple months ago. Unfortunately, the volume increase button was not work suddenly. It might impact the laptop's warranty if I open the laptop and check the issue, so I send it back to Lenovo for repairing. I was told the board which contains the volume control buttons was broken,It took me 3 days waiting to get back my laptop. But I found out a new issue very soon, the screen rotation lock button was not working after the repairing. Actually, this is the reason why most of time I like to check these kind of problems by myself, they always make things worse. So, I open it up and found the root cause, the Lenovo guy forgot connect the button battery wires. Here is the photo after I open the laptop up:
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