Backlit Keyboard has stopped working on Satellite P50-A-12Z

I bought my Satellite P50-A-12Z over a year ago, and since few weeks the backlit keyboard has stopped working.
I used to hold FN+W to turn on/off the light keyboard, but now it doesn't work anymore and I have the message "chronometer" on the top right of the screen as you can see on this screenshot:
https://imagizer.imageshack.us/v2/1050x591q90/903/Estd0f.png
When I go to Desktop Assist > Tools & Utilities > Function Key , keyboard backlight is set to OFF but can't set it to ON:
https://imagizer.imageshack.us/v2/1050x591q90/745/gMqGvq.png
Please help me

Hi
I don't know if this will help but try please following: perform complete shutdown - http://aps2.toshiba-tro.de/kb0/TSB2B03EY0002R01.htm
Start notebook again and press F12. There you should find option to enter BIOS settings. Enter BIOS settings and try to enable keyboard backlight there.
Please test it and send some feedback.

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Backlit Keyboard has stopped working on Satellite P50-A-12Z

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