Keyboard backlight on my HP Laptop Q3DUCL9R. How can I backlight my keyboard?

[NewPilot]

Why can I not backlight the keyboard on my HP Laptop Q3DUCL9R ?

[Dragon-Fur]

@NewPilot 

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Q3DUCL9R is not found.  ?

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Regardless, the answer to this question is generally the same --

Backlit keyboard is usually an OPTIONAL feature.

That means: 

Not all computers have a backlit keyboard when purchased.

If your computer does not include a backlit keyboard 

AND

If your computer series offers a backlit keyboard as an option that can be added,

then

Check in your computer's Maintenance & Service Guide for the part number AND the instructions to install the keyboard.

NOTE:

Installing a backlit keyboard might (usually) mean that the computer must be completely dis-assembled to reach and replace the keyboard.  In most cases, replacing the keyboard is not considered a novice level task.  

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