Share your experience!
MY Xperia SP is having a problem with left LED of the illumination bar.
Left LED shows different colour then the other two LED's......
PLEASE HELP!!!!
Disable the firmware default lights and use alternative softwares ,like Illumination bar !
Having same problem with th illumination bar app after turning off the fimware default LED...
You can see that the left LED is Showing different colour than the other two LED
Hmmm. Strange. Try factory data reset the phone. (settings/reset-backup). Do not backup/restore the settings. It will erase everything !
If it wont help... I have no idea.... Maybe service center ?
good luck ! 
try 3rd party apps and see the same happens?
also try safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
THANKS MAN!!
I think you are right. The green LED is not working..
KUDOS to you!!!!!