If your Lenovo Yoga 900 won't charge or the power connection is flaky, the issue might be this little internal cable.

This is a replacement DC power jack cable, designed specifically for the Yoga 900-13ISK and 900-13ISK2 models (often with model numbers like 80MK).
The part numbers DC30100PN00, DC30100PL00, and 5C10K48429 are the ones to look for.

It's the piece that connects from the charging port on the motherboard to the outside world.

This is a brand new, unbranded replacement part.
If you're handy with a screwdriver and follow a teardown guide, you can save yourself a trip to the repair shop.

Fix that loose or dead charging port and get your Yoga back up and running.

It's a small part, but it's the heart of keeping your laptop powered up.