Lenovo Yoga laptops, especially those from the “900”, “920”, “930”, and “940” series, have a design defect where their power circuitry can self-destruct. The company will not acknowledge this defect as serious enough for a recall, and has left many customers with broken audio (or worse) on their notebooks. I have micrograph of this defect on my own Yoga, transistor “Q5” has a hole blown clean through it. According to the schematic I found, it’s a power MOSFET that turns on/off the audio circu...