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Amazon.com: for Lenovo B50-30 B50-45 B50-70 B50-80 Power Button ON/Off Switch Board LS-B098P : Electronics
LENOVO B50 15.6" Laptop, Intel i3-4030U, 4GB Memory, 500GB Hard Drive*FREE UPGRADE TO WINDOWS 10 - Sam's Club
Lenovo B50 Series B50-80 Laptop Notebook Disassembly Complete Strip-Down Step by Step Tutorial - YouTube