Credit: Acer
Connecting Acer’s C120 Pico projector to the Surface Pro 3 is harder than you may think due to the Surface Pro 3’s low power output on its sole USB port. The projector is designed to connect via USB and then install its driver off the projector (presumably stored in some kind of ROM on the projector), but usually the Surface Pro 3 won’t even make it to the installation screen. Even the external power adapter for the C120 has not been enough to get it going. I finally got it working by connecting the thin USB cable (plug with the white plastic in it) to the USB port on the Surface Pro 3’s power adapter, and the main USB cable (plug with the blue plastic in it) to the Surface Pro 3 afterwards. Sometimes, it takes a little while for the driver install to complete. Note that for projection, you’ll want your Surface to be set to display screen elements at 100%.
USB port on power adapter – connect the secondary USB cable here
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