I haven't seen the blue LED before, however, I notice on mine (stock original OS on the US Best Buy Model) I see a white LED on the back of the S7, shining through the plastic whenever the backlight is on the touchscreen. This is very weird. This is WITHOUT the camera app launched. Anyone see this either?
Yes, there is a blue LED and it shows up in certain ROMS. I think the harware is the same it is the implemetation in the software that is different. I have installed a few of them and I think have seen this "mysterious" light in about 2 different firmwares that I have installed.