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What does the cable do and should a attach it

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I was working on my friend's MacBook when I saw that one of the cables was disconnected I don't really know what it does but it's right next to the other connectors that attached to the SATA and keyboard and mouse I just don't know what the cable does that's next to the ram could you help me out?

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Your logic board offers a backlight keyboard option! While your system might not have the needed backlight plate it can be installed at which time the keyboard would light up.

Review Steps 13 &14 in this guide MacBook Pro 13" Unibody Mid 2010 Logic Board Replacement

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Chase reitelbach crwdns2934231:0crwdne2934231:0
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