Originally Posted by videobruce
Light might affect optical, but not HDMI unless it is a thermal issue.
I have read a post on the newer 1080P model where a gentleman from Alberta Canada gave a detailed explanation for "blocking the light sensor" that kills the HDMI input. I agree with him that putting a "doomsday device" like that into the design was ridiculous. It further aggravates me that I have lived with this problem for YEARS without help from the factory service personnel or JVC corporate whom I pleaded with for help during the warrantee period. It died three days after the then new TV went into service. It took seven months to get serviced. They came out and swapped the Digital module (two trips) which fixed it for a few months. Some dust may have settled into a ventilation port which reflects enough light to cause the current problem. Obviously, the replaced digital module still works, when it isn't being shut down erroneously.
I have installed a dark curtain between the back of the TV and the window behind it, and voila, The HDMI input continues to function during a sunny day without experiencing the vampire effect.