SV1620, SV1630: Poor picture or no picture / sound, how I can adjust it?

Make sure the power adapter is well connected and the LED on the Smart HDMI Switch is on. Make sure the HDMI cables are properly connected and your sources and TV/display are supporting the right resolution, including the HDCP (High bandwidth digital content protection) see devices into the instruction manual, Wikipedia or manufacturer info on specific make/model.

Connect the source device to the TV/display directly. Does it work correctly?