Failure of the USB-C board on the Yoga 910 and other Lenovo laptops is very common.
Symptoms include not charging, not reading USB-C. The failure seems to be caused by plugging power into the non power USB-C port.
Replacement boards are rare and very expensive.
The problem can be resolved easily and inexpensively by replacing the USB-C controller chip. I have confirmed this fix on 3 boards.
The Chip is a PS8743A
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Also, beware the flex cables joining the daughter boards to the motherboard. They do not seat very well and can cause issues if not seated properly.