It depends on your receiver. My receiver (Yamaha 673) has hdmi ports plus a usb power port so I connect the chromecast through the receiver (actually all of my devices connect to the receiver first and I only use 1 hdmi from the receiver to TV) If your receiver doesn't have an hdmi then hopefully your projection TV does have hdmi and also some type of audio out to plug in either an rca or 3mm audio out back to your receiver.