I have a Proscan PLT9604. I have purchased a micro usb to hdmi gongle so that I might connect to my tv. It is not registering the change in the output. (It will not see the source) Might the cable be faulty or is Proscan not able to read the hdmi output? I have been able to connect to the tv via Chromecast. But I want to be able to connect to my tv when there is no wifi available