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If it is on and off while you are using it its defective. If you are trying to keep it on while the device goes into sleep mode or power saving mode, you need to disable those modes.
Sorry, there was a problem. Please try again later.The keyboard backlit will turn off if the laptop goes into sleep mode. The laptop needs to be setup to "never sleep" the Control Panel, Power Options, Change when the computer sleeps, in order to keep the keyboard backlit on.
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