To my knowledge the GT683 didn't come with the Backlit keyboards from steel series it was the same for the Whitebook version MS-16F2.
However Backlit keyboards did arrive when the GT780 was release and that was on both the MSI branded and MSI Whitebooks,
To get a backlit keyboard working on the GT683 series you need to make some modifications to the laptop which requires soldering.
You could do a google search for DIY Blue Backlit Steel-Series Keyboard Mod for MSI GT683R for more information.
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