My Sony Bravia 3D TV works well as long as the cabinet enclosure for the widescreen is open. As soon as the door is closed, the signal from the TV to activate the 3D glasses is blocked. Is there a repeater or transmitter that will fix this? There is only 3/8" space between the cabinet door and the face of the TV screen (lower left corner). What frequency is used? Is this IR ir RF?
IR is line of sight. You could try using reflective tape or a small mirror to redirect the signal. This is what I use to extend the IR sensor when building frames around the TV casing and it works fairly well.