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I have xperia sl with jelly bean 4.1.2
build number 6.2.b.0.211..........my led notification pulse doen't work at all......when I put charger doesnt work ,,,when I get any call or sms ,,doesnt work at all plz help me!!!!
Have you tried to just restart the phone by press and hold the power button and the volume up at the same time until the phone vibrates?
You can try the LED notification light in the service menu. Press *#*#7378423#*#* > service tests > LED/Illumination.
If the LED light doesn't work in the service menu I suggest that you have the phone examined at a service center. Please contact your local support for more information:
Not going to fix the LED problem you have but as an alternative the illumination bar at the bottom can be used to inform you of missed calls and txt messages etc https://play.google.com/store/apps/details?id=com.rundgong.illuminationcontrol&hl=en-GB