I am living in a hotel for the next two months - the TV does not have an input button but does have inputs in the back for a DVD player. The TV model is an RCA J27430, so I bought a RCA Universal Remote, model RCR312W. I've tried all of the RCA codes, and the input button functions as a "Go Back" or "Last Channel" button on almost all of the those codes. You cannot change inputs via the normal TV menu either. Help!