“Yoga C940 only has 2 thunderbolt ports and 1 USB 3.0. So there is no HDMI port to hook up external monitor. Are the Thunderbolt 1, 2, or 3? Purchase new last month a Lenova-Yoga C940 2-in-1 14 " Touch-Screen Laptop”
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The Lenovo Yoga C940-15 model number 81TE0000US uses Thunderbolt 3.0 ports for video out. you can connect an external monitor via a direct Thunderbolt connection or if you have a HDMI monitor, by using a Thunderbolt 3.0 to HDMI adapter. If you have the Yoga C940-14 one Thunderbolt port is for power into the computer. Your question is attached to the Yoga C940-15 model which ships with a discrete NVIDIA GTX 1650 GPU and can support two monitors through the two Thunderbolt 3.0 ports. There is a separate, dedicated power port on the Yoga C940-15 model that supports the 135W external power supply required by the Yoga C940-15 configuration.
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