Hi Ramin_20_s,
Welcome to Sony Community!
Sorry to hear about this. May I know what is the model name and the current operating system of your laptop? Is the keyboard backlit setting turned off?
For further assistance regarding your concern, please contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
Regards,
Jen
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