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I have a SONY XPERIA Z5 Premium . The problem is the tiny LED notification light doesn't show red light. i have tried various led light management applications from the play store but still ain't working. What may be causing this? Running Android 6.0 Marshmallow

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Have you tested the LED through the service menu?

To enter the service menu go to the dialer and paste in the following code

*#*#7378423#*#*

Select

Service tests

and then

LED/Illumination

The LED should start to blink in green then blue then red. If your led is not blinking red I would suggest your LED is broken.

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  • Hey, i have tried those tests....only the green and blue colors are functional. I meant the red color ain't working when it's set Dec 10, 2016 at 18:51
  • Then I believe the LED is broken. Can you return it to the store for a refund?
    – kirodge
    Dec 10, 2016 at 18:53
  • Unfortunately , the device is a second hand and is not under any Warranty. I thot the led module works as one unit. Dec 10, 2016 at 18:56
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    Well I'm not sure but according to wikipedia "tri-color LEDs contain three different LED emitters in one case. Each emitter is connected to a separate lead so they can be controlled independently." en.wikipedia.org/wiki/Light-emitting_diode
    – kirodge
    Dec 10, 2016 at 19:03

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