Maximum fan speed when airport cable is connected and broken fuse

Hi to all. I bought from a friend a broken MacBook Pro 13" mid 2010 2.66GHz . The fan ran at full speed and it took too much time to get started. So I unplugged the cable that connects the motherboard with the wifi card, bluetooth and iSight camera and now the Mac works well, without wifi, BT and iSight. I repaired the fuse near the wifi cable connector which had broken out for this problem.

What could be the cause? I think the problem could be wifi board failed or shorted cable? My macbook now is no wifi, and in this state is no longer a laptop ... I hope that any of you have experience on this issue.

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