First clean the board, even if you cont "see" anything doesn't meanie's not there.
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'''I aslo have a question, what end of the flex cable was damaged? Logicboard end or I/O end? '''
There is no reason to buy an entire uppercase, we always opt for keyboard only replacements, they are a much better value and are easy to install.
[https://www.ebay.com/p/?iid=301134821626&&&chn=ps]