There is a cable connection to the logic board that might have worked loose. Review the IFIXIT guide [guide|6368|MacBook Air 13" Mid 2011 Logic Board Replacement] Step 12.
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There is a cable connection to the I/O board that might have worked loose. Review the IFIXIT guide [guide|6368|MacBook Air 13" Mid 2011 Logic Board Replacement] Step 12.
The other possibility it the camera unit has gone bad. Which will require replacing the full lid assembly unless you can find the part alone.
There is a cable connection to the logic board that might have worked loose. Review the IFIXIT guide [guide|6368|MacBook Air 13" Mid 2011 Logic Board Replacement] Step 12.
The other possibility it the camera unit has gone bad. Which will require replacing the full lid assembly unless you can find the part alone.